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4c4d6077d3
Add an entry for RISC-V OpenSBI's 'fw_dynamic' firmware payload. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Rick Chen <rick@andestech.com> Reviewed-by: Rick Chen <rick@andestech.com>
1459 lines
50 KiB
ReStructuredText
1459 lines
50 KiB
ReStructuredText
Binman Entry Documentation
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===========================
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This file describes the entry types supported by binman. These entry types can
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be placed in an image one by one to build up a final firmware image. It is
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fairly easy to create new entry types. Just add a new file to the 'etype'
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directory. You can use the existing entries as examples.
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Note that some entries are subclasses of others, using and extending their
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features to produce new behaviours.
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Entry: atf-bl31: ARM Trusted Firmware (ATF) BL31 blob
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-----------------------------------------------------
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Properties / Entry arguments:
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- atf-bl31-path: Filename of file to read into entry. This is typically
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called bl31.bin or bl31.elf
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This entry holds the run-time firmware, typically started by U-Boot SPL.
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See the U-Boot README for your architecture or board for how to use it. See
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https://github.com/ARM-software/arm-trusted-firmware for more information
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about ATF.
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Entry: blob: Arbitrary binary blob
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----------------------------------
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Note: This should not be used by itself. It is normally used as a parent
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class by other entry types.
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Properties / Entry arguments:
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- filename: Filename of file to read into entry
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- compress: Compression algorithm to use:
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none: No compression
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lz4: Use lz4 compression (via 'lz4' command-line utility)
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This entry reads data from a file and places it in the entry. The
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default filename is often specified specified by the subclass. See for
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example the 'u-boot' entry which provides the filename 'u-boot.bin'.
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If compression is enabled, an extra 'uncomp-size' property is written to
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the node (if enabled with -u) which provides the uncompressed size of the
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data.
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Entry: blob-dtb: A blob that holds a device tree
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------------------------------------------------
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This is a blob containing a device tree. The contents of the blob are
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obtained from the list of available device-tree files, managed by the
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'state' module.
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Entry: blob-ext: Externally built binary blob
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---------------------------------------------
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Note: This should not be used by itself. It is normally used as a parent
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class by other entry types.
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If the file providing this blob is missing, binman can optionally ignore it
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and produce a broken image with a warning.
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See 'blob' for Properties / Entry arguments.
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Entry: blob-named-by-arg: A blob entry which gets its filename property from its subclass
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-----------------------------------------------------------------------------------------
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Properties / Entry arguments:
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- <xxx>-path: Filename containing the contents of this entry (optional,
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defaults to None)
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where <xxx> is the blob_fname argument to the constructor.
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This entry cannot be used directly. Instead, it is used as a parent class
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for another entry, which defined blob_fname. This parameter is used to
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set the entry-arg or property containing the filename. The entry-arg or
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property is in turn used to set the actual filename.
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See cros_ec_rw for an example of this.
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Entry: blob-phase: Section that holds a phase binary
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----------------------------------------------------
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This is a base class that should not normally be used directly. It is used
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when converting a 'u-boot' entry automatically into a 'u-boot-expanded'
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entry; similarly for SPL.
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Entry: cbfs: Coreboot Filesystem (CBFS)
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---------------------------------------
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A CBFS provides a way to group files into a group. It has a simple directory
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structure and allows the position of individual files to be set, since it is
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designed to support execute-in-place in an x86 SPI-flash device. Where XIP
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is not used, it supports compression and storing ELF files.
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CBFS is used by coreboot as its way of orgnanising SPI-flash contents.
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The contents of the CBFS are defined by subnodes of the cbfs entry, e.g.::
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cbfs {
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size = <0x100000>;
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u-boot {
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cbfs-type = "raw";
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};
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u-boot-dtb {
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cbfs-type = "raw";
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};
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};
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This creates a CBFS 1MB in size two files in it: u-boot.bin and u-boot.dtb.
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Note that the size is required since binman does not support calculating it.
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The contents of each entry is just what binman would normally provide if it
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were not a CBFS node. A blob type can be used to import arbitrary files as
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with the second subnode below::
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cbfs {
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size = <0x100000>;
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u-boot {
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cbfs-name = "BOOT";
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cbfs-type = "raw";
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};
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dtb {
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type = "blob";
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filename = "u-boot.dtb";
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cbfs-type = "raw";
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cbfs-compress = "lz4";
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cbfs-offset = <0x100000>;
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};
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};
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This creates a CBFS 1MB in size with u-boot.bin (named "BOOT") and
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u-boot.dtb (named "dtb") and compressed with the lz4 algorithm.
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Properties supported in the top-level CBFS node:
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cbfs-arch:
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Defaults to "x86", but you can specify the architecture if needed.
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Properties supported in the CBFS entry subnodes:
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cbfs-name:
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This is the name of the file created in CBFS. It defaults to the entry
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name (which is the node name), but you can override it with this
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property.
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cbfs-type:
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This is the CBFS file type. The following are supported:
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raw:
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This is a 'raw' file, although compression is supported. It can be
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used to store any file in CBFS.
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stage:
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This is an ELF file that has been loaded (i.e. mapped to memory), so
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appears in the CBFS as a flat binary. The input file must be an ELF
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image, for example this puts "u-boot" (the ELF image) into a 'stage'
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entry::
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cbfs {
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size = <0x100000>;
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u-boot-elf {
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cbfs-name = "BOOT";
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cbfs-type = "stage";
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};
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};
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You can use your own ELF file with something like::
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cbfs {
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size = <0x100000>;
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something {
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type = "blob";
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filename = "cbfs-stage.elf";
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cbfs-type = "stage";
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};
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};
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As mentioned, the file is converted to a flat binary, so it is
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equivalent to adding "u-boot.bin", for example, but with the load and
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start addresses specified by the ELF. At present there is no option
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to add a flat binary with a load/start address, similar to the
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'add-flat-binary' option in cbfstool.
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cbfs-offset:
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This is the offset of the file's data within the CBFS. It is used to
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specify where the file should be placed in cases where a fixed position
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is needed. Typical uses are for code which is not relocatable and must
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execute in-place from a particular address. This works because SPI flash
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is generally mapped into memory on x86 devices. The file header is
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placed before this offset so that the data start lines up exactly with
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the chosen offset. If this property is not provided, then the file is
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placed in the next available spot.
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The current implementation supports only a subset of CBFS features. It does
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not support other file types (e.g. payload), adding multiple files (like the
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'files' entry with a pattern supported by binman), putting files at a
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particular offset in the CBFS and a few other things.
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Of course binman can create images containing multiple CBFSs, simply by
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defining these in the binman config::
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binman {
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size = <0x800000>;
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cbfs {
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offset = <0x100000>;
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size = <0x100000>;
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u-boot {
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cbfs-type = "raw";
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};
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u-boot-dtb {
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cbfs-type = "raw";
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};
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};
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cbfs2 {
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offset = <0x700000>;
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size = <0x100000>;
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u-boot {
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cbfs-type = "raw";
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};
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u-boot-dtb {
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cbfs-type = "raw";
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};
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image {
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type = "blob";
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filename = "image.jpg";
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};
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};
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};
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This creates an 8MB image with two CBFSs, one at offset 1MB, one at 7MB,
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both of size 1MB.
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Entry: collection: An entry which contains a collection of other entries
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------------------------------------------------------------------------
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Properties / Entry arguments:
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- content: List of phandles to entries to include
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This allows reusing the contents of other entries. The contents of the
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listed entries are combined to form this entry. This serves as a useful
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base class for entry types which need to process data from elsewhere in
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the image, not necessarily child entries.
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Entry: cros-ec-rw: A blob entry which contains a Chromium OS read-write EC image
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--------------------------------------------------------------------------------
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Properties / Entry arguments:
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- cros-ec-rw-path: Filename containing the EC image
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This entry holds a Chromium OS EC (embedded controller) image, for use in
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updating the EC on startup via software sync.
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Entry: fdtmap: An entry which contains an FDT map
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-------------------------------------------------
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Properties / Entry arguments:
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None
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An FDT map is just a header followed by an FDT containing a list of all the
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entries in the image. The root node corresponds to the image node in the
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original FDT, and an image-name property indicates the image name in that
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original tree.
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The header is the string _FDTMAP_ followed by 8 unused bytes.
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When used, this entry will be populated with an FDT map which reflects the
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entries in the current image. Hierarchy is preserved, and all offsets and
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sizes are included.
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Note that the -u option must be provided to ensure that binman updates the
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FDT with the position of each entry.
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Example output for a simple image with U-Boot and an FDT map::
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/ {
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image-name = "binman";
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size = <0x00000112>;
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image-pos = <0x00000000>;
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offset = <0x00000000>;
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u-boot {
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size = <0x00000004>;
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image-pos = <0x00000000>;
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offset = <0x00000000>;
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};
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fdtmap {
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size = <0x0000010e>;
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image-pos = <0x00000004>;
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offset = <0x00000004>;
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};
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};
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If allow-repack is used then 'orig-offset' and 'orig-size' properties are
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added as necessary. See the binman README.
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Entry: files: A set of files arranged in a section
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--------------------------------------------------
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Properties / Entry arguments:
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- pattern: Filename pattern to match the files to include
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- files-compress: Compression algorithm to use:
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none: No compression
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lz4: Use lz4 compression (via 'lz4' command-line utility)
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- files-align: Align each file to the given alignment
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This entry reads a number of files and places each in a separate sub-entry
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within this entry. To access these you need to enable device-tree updates
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at run-time so you can obtain the file positions.
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Entry: fill: An entry which is filled to a particular byte value
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----------------------------------------------------------------
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Properties / Entry arguments:
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- fill-byte: Byte to use to fill the entry
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Note that the size property must be set since otherwise this entry does not
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know how large it should be.
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You can often achieve the same effect using the pad-byte property of the
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overall image, in that the space between entries will then be padded with
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that byte. But this entry is sometimes useful for explicitly setting the
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byte value of a region.
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Entry: fit: Flat Image Tree (FIT)
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---------------------------------
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This calls mkimage to create a FIT (U-Boot Flat Image Tree) based on the
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input provided.
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Nodes for the FIT should be written out in the binman configuration just as
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they would be in a file passed to mkimage.
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For example, this creates an image containing a FIT with U-Boot SPL::
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binman {
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fit {
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description = "Test FIT";
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fit,fdt-list = "of-list";
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images {
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kernel@1 {
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description = "SPL";
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os = "u-boot";
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type = "rkspi";
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arch = "arm";
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compression = "none";
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load = <0>;
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entry = <0>;
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u-boot-spl {
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};
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};
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};
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};
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};
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U-Boot supports creating fdt and config nodes automatically. To do this,
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pass an of-list property (e.g. -a of-list=file1 file2). This tells binman
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that you want to generates nodes for two files: file1.dtb and file2.dtb
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The fit,fdt-list property (see above) indicates that of-list should be used.
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If the property is missing you will get an error.
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Then add a 'generator node', a node with a name starting with '@'::
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images {
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@fdt-SEQ {
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description = "fdt-NAME";
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type = "flat_dt";
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compression = "none";
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};
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};
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This tells binman to create nodes fdt-1 and fdt-2 for each of your two
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files. All the properties you specify will be included in the node. This
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node acts like a template to generate the nodes. The generator node itself
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does not appear in the output - it is replaced with what binman generates.
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You can create config nodes in a similar way::
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configurations {
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default = "@config-DEFAULT-SEQ";
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@config-SEQ {
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description = "NAME";
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firmware = "atf";
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loadables = "uboot";
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fdt = "fdt-SEQ";
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};
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};
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This tells binman to create nodes config-1 and config-2, i.e. a config for
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each of your two files.
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Available substitutions for '@' nodes are:
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SEQ:
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Sequence number of the generated fdt (1, 2, ...)
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NAME
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Name of the dtb as provided (i.e. without adding '.dtb')
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Note that if no devicetree files are provided (with '-a of-list' as above)
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then no nodes will be generated.
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The 'default' property, if present, will be automatically set to the name
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if of configuration whose devicetree matches the 'default-dt' entry
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argument, e.g. with '-a default-dt=sun50i-a64-pine64-lts'.
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Available substitutions for '@' property values are
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DEFAULT-SEQ:
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Sequence number of the default fdt,as provided by the 'default-dt' entry
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argument
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Properties (in the 'fit' node itself):
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fit,external-offset: Indicates that the contents of the FIT are external
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and provides the external offset. This is passsed to mkimage via
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the -E and -p flags.
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Entry: fmap: An entry which contains an Fmap section
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----------------------------------------------------
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Properties / Entry arguments:
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None
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FMAP is a simple format used by flashrom, an open-source utility for
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reading and writing the SPI flash, typically on x86 CPUs. The format
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provides flashrom with a list of areas, so it knows what it in the flash.
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It can then read or write just a single area, instead of the whole flash.
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The format is defined by the flashrom project, in the file lib/fmap.h -
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see www.flashrom.org/Flashrom for more information.
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When used, this entry will be populated with an FMAP which reflects the
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entries in the current image. Note that any hierarchy is squashed, since
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FMAP does not support this. Sections are represented as an area appearing
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before its contents, so that it is possible to reconstruct the hierarchy
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from the FMAP by using the offset information. This convention does not
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seem to be documented, but is used in Chromium OS.
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CBFS entries appear as a single entry, i.e. the sub-entries are ignored.
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Entry: gbb: An entry which contains a Chromium OS Google Binary Block
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---------------------------------------------------------------------
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Properties / Entry arguments:
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- hardware-id: Hardware ID to use for this build (a string)
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- keydir: Directory containing the public keys to use
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- bmpblk: Filename containing images used by recovery
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Chromium OS uses a GBB to store various pieces of information, in particular
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the root and recovery keys that are used to verify the boot process. Some
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more details are here:
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https://www.chromium.org/chromium-os/firmware-porting-guide/2-concepts
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but note that the page dates from 2013 so is quite out of date. See
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README.chromium for how to obtain the required keys and tools.
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Entry: image-header: An entry which contains a pointer to the FDT map
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---------------------------------------------------------------------
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Properties / Entry arguments:
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location: Location of header ("start" or "end" of image). This is
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optional. If omitted then the entry must have an offset property.
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This adds an 8-byte entry to the start or end of the image, pointing to the
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location of the FDT map. The format is a magic number followed by an offset
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from the start or end of the image, in twos-compliment format.
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This entry must be in the top-level part of the image.
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NOTE: If the location is at the start/end, you will probably need to specify
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sort-by-offset for the image, unless you actually put the image header
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first/last in the entry list.
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Entry: intel-cmc: Intel Chipset Micro Code (CMC) file
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-----------------------------------------------------
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Properties / Entry arguments:
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- filename: Filename of file to read into entry
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This file contains microcode for some devices in a special format. An
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example filename is 'Microcode/C0_22211.BIN'.
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See README.x86 for information about x86 binary blobs.
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Entry: intel-descriptor: Intel flash descriptor block (4KB)
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-----------------------------------------------------------
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Properties / Entry arguments:
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filename: Filename of file containing the descriptor. This is typically
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a 4KB binary file, sometimes called 'descriptor.bin'
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This entry is placed at the start of flash and provides information about
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the SPI flash regions. In particular it provides the base address and
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size of the ME (Management Engine) region, allowing us to place the ME
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binary in the right place.
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With this entry in your image, the position of the 'intel-me' entry will be
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fixed in the image, which avoids you needed to specify an offset for that
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region. This is useful, because it is not possible to change the position
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of the ME region without updating the descriptor.
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See README.x86 for information about x86 binary blobs.
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Entry: intel-fit: Intel Firmware Image Table (FIT)
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--------------------------------------------------
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This entry contains a dummy FIT as required by recent Intel CPUs. The FIT
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contains information about the firmware and microcode available in the
|
|
image.
|
|
|
|
At present binman only supports a basic FIT with no microcode.
|
|
|
|
|
|
|
|
Entry: intel-fit-ptr: Intel Firmware Image Table (FIT) pointer
|
|
--------------------------------------------------------------
|
|
|
|
This entry contains a pointer to the FIT. It is required to be at address
|
|
0xffffffc0 in the image.
|
|
|
|
|
|
|
|
Entry: intel-fsp: Intel Firmware Support Package (FSP) file
|
|
-----------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains binary blobs which are used on some devices to make the
|
|
platform work. U-Boot executes this code since it is not possible to set up
|
|
the hardware using U-Boot open-source code. Documentation is typically not
|
|
available in sufficient detail to allow this.
|
|
|
|
An example filename is 'FSP/QUEENSBAY_FSP_GOLD_001_20-DECEMBER-2013.fd'
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-fsp-m: Intel Firmware Support Package (FSP) memory init
|
|
--------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains a binary blob which is used on some devices to set up
|
|
SDRAM. U-Boot executes this code in SPL so that it can make full use of
|
|
memory. Documentation is typically not available in sufficient detail to
|
|
allow U-Boot do this this itself..
|
|
|
|
An example filename is 'fsp_m.bin'
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-fsp-s: Intel Firmware Support Package (FSP) silicon init
|
|
---------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains a binary blob which is used on some devices to set up
|
|
the silicon. U-Boot executes this code in U-Boot proper after SDRAM is
|
|
running, so that it can make full use of memory. Documentation is typically
|
|
not available in sufficient detail to allow U-Boot do this this itself.
|
|
|
|
An example filename is 'fsp_s.bin'
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-fsp-t: Intel Firmware Support Package (FSP) temp ram init
|
|
----------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains a binary blob which is used on some devices to set up
|
|
temporary memory (Cache-as-RAM or CAR). U-Boot executes this code in TPL so
|
|
that it has access to memory for its stack and initial storage.
|
|
|
|
An example filename is 'fsp_t.bin'
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-ifwi: Intel Integrated Firmware Image (IFWI) file
|
|
--------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry. This is either the
|
|
IFWI file itself, or a file that can be converted into one using a
|
|
tool
|
|
- convert-fit: If present this indicates that the ifwitool should be
|
|
used to convert the provided file into a IFWI.
|
|
|
|
This file contains code and data used by the SoC that is required to make
|
|
it work. It includes U-Boot TPL, microcode, things related to the CSE
|
|
(Converged Security Engine, the microcontroller that loads all the firmware)
|
|
and other items beyond the wit of man.
|
|
|
|
A typical filename is 'ifwi.bin' for an IFWI file, or 'fitimage.bin' for a
|
|
file that will be converted to an IFWI.
|
|
|
|
The position of this entry is generally set by the intel-descriptor entry.
|
|
|
|
The contents of the IFWI are specified by the subnodes of the IFWI node.
|
|
Each subnode describes an entry which is placed into the IFWFI with a given
|
|
sub-partition (and optional entry name).
|
|
|
|
Properties for subnodes:
|
|
- ifwi-subpart: sub-parition to put this entry into, e.g. "IBBP"
|
|
- ifwi-entry: entry name t use, e.g. "IBBL"
|
|
- ifwi-replace: if present, indicates that the item should be replaced
|
|
in the IFWI. Otherwise it is added.
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-me: Intel Management Engine (ME) file
|
|
--------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains code used by the SoC that is required to make it work.
|
|
The Management Engine is like a background task that runs things that are
|
|
not clearly documented, but may include keyboard, display and network
|
|
access. For platform that use ME it is not possible to disable it. U-Boot
|
|
does not directly execute code in the ME binary.
|
|
|
|
A typical filename is 'me.bin'.
|
|
|
|
The position of this entry is generally set by the intel-descriptor entry.
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-mrc: Intel Memory Reference Code (MRC) file
|
|
--------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains code for setting up the SDRAM on some Intel systems. This
|
|
is executed by U-Boot when needed early during startup. A typical filename
|
|
is 'mrc.bin'.
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-refcode: Intel Reference Code file
|
|
-----------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains code for setting up the platform on some Intel systems.
|
|
This is executed by U-Boot when needed early during startup. A typical
|
|
filename is 'refcode.bin'.
|
|
|
|
See README.x86 for information about x86 binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-vbt: Intel Video BIOS Table (VBT) file
|
|
---------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains code that sets up the integrated graphics subsystem on
|
|
some Intel SoCs. U-Boot executes this when the display is started up.
|
|
|
|
See README.x86 for information about Intel binary blobs.
|
|
|
|
|
|
|
|
Entry: intel-vga: Intel Video Graphics Adaptor (VGA) file
|
|
---------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of file to read into entry
|
|
|
|
This file contains code that sets up the integrated graphics subsystem on
|
|
some Intel SoCs. U-Boot executes this when the display is started up.
|
|
|
|
This is similar to the VBT file but in a different format.
|
|
|
|
See README.x86 for information about Intel binary blobs.
|
|
|
|
|
|
|
|
Entry: mkimage: Binary produced by mkimage
|
|
------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- datafile: Filename for -d argument
|
|
- args: Other arguments to pass
|
|
|
|
The data passed to mkimage is collected from subnodes of the mkimage node,
|
|
e.g.::
|
|
|
|
mkimage {
|
|
args = "-n test -T imximage";
|
|
|
|
u-boot-spl {
|
|
};
|
|
};
|
|
|
|
This calls mkimage to create an imximage with u-boot-spl.bin as the input
|
|
file. The output from mkimage then becomes part of the image produced by
|
|
binman.
|
|
|
|
|
|
|
|
Entry: opensbi: RISC-V OpenSBI fw_dynamic blob
|
|
----------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- opensbi-path: Filename of file to read into entry. This is typically
|
|
called fw_dynamic.bin
|
|
|
|
This entry holds the run-time firmware, typically started by U-Boot SPL.
|
|
See the U-Boot README for your architecture or board for how to use it. See
|
|
https://github.com/riscv/opensbi for more information about OpenSBI.
|
|
|
|
|
|
|
|
Entry: powerpc-mpc85xx-bootpg-resetvec: PowerPC mpc85xx bootpg + resetvec code for U-Boot
|
|
-----------------------------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-br.bin (default 'u-boot-br.bin')
|
|
|
|
This entry is valid for PowerPC mpc85xx cpus. This entry holds
|
|
'bootpg + resetvec' code for PowerPC mpc85xx CPUs which needs to be
|
|
placed at offset 'RESET_VECTOR_ADDRESS - 0xffc'.
|
|
|
|
|
|
|
|
Entry: scp: System Control Processor (SCP) firmware blob
|
|
--------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- scp-path: Filename of file to read into the entry, typically scp.bin
|
|
|
|
This entry holds firmware for an external platform-specific coprocessor.
|
|
|
|
|
|
|
|
Entry: section: Entry that contains other entries
|
|
-------------------------------------------------
|
|
|
|
Properties / Entry arguments: (see binman README for more information):
|
|
pad-byte: Pad byte to use when padding
|
|
sort-by-offset: True if entries should be sorted by offset, False if
|
|
they must be in-order in the device tree description
|
|
|
|
end-at-4gb: Used to build an x86 ROM which ends at 4GB (2^32)
|
|
|
|
skip-at-start: Number of bytes before the first entry starts. These
|
|
effectively adjust the starting offset of entries. For example,
|
|
if this is 16, then the first entry would start at 16. An entry
|
|
with offset = 20 would in fact be written at offset 4 in the image
|
|
file, since the first 16 bytes are skipped when writing.
|
|
name-prefix: Adds a prefix to the name of every entry in the section
|
|
when writing out the map
|
|
align_default: Default alignment for this section, if no alignment is
|
|
given in the entry
|
|
|
|
Properties:
|
|
allow_missing: True if this section permits external blobs to be
|
|
missing their contents. The second will produce an image but of
|
|
course it will not work.
|
|
|
|
Properties:
|
|
_allow_missing: True if this section permits external blobs to be
|
|
missing their contents. The second will produce an image but of
|
|
course it will not work.
|
|
|
|
Since a section is also an entry, it inherits all the properies of entries
|
|
too.
|
|
|
|
A section is an entry which can contain other entries, thus allowing
|
|
hierarchical images to be created. See 'Sections and hierarchical images'
|
|
in the binman README for more information.
|
|
|
|
|
|
|
|
Entry: text: An entry which contains text
|
|
-----------------------------------------
|
|
|
|
The text can be provided either in the node itself or by a command-line
|
|
argument. There is a level of indirection to allow multiple text strings
|
|
and sharing of text.
|
|
|
|
Properties / Entry arguments:
|
|
text-label: The value of this string indicates the property / entry-arg
|
|
that contains the string to place in the entry
|
|
<xxx> (actual name is the value of text-label): contains the string to
|
|
place in the entry.
|
|
<text>: The text to place in the entry (overrides the above mechanism).
|
|
This is useful when the text is constant.
|
|
|
|
Example node::
|
|
|
|
text {
|
|
size = <50>;
|
|
text-label = "message";
|
|
};
|
|
|
|
You can then use:
|
|
|
|
binman -amessage="this is my message"
|
|
|
|
and binman will insert that string into the entry.
|
|
|
|
It is also possible to put the string directly in the node::
|
|
|
|
text {
|
|
size = <8>;
|
|
text-label = "message";
|
|
message = "a message directly in the node"
|
|
};
|
|
|
|
or just::
|
|
|
|
text {
|
|
size = <8>;
|
|
text = "some text directly in the node"
|
|
};
|
|
|
|
The text is not itself nul-terminated. This can be achieved, if required,
|
|
by setting the size of the entry to something larger than the text.
|
|
|
|
|
|
|
|
Entry: u-boot: U-Boot flat binary
|
|
---------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot.bin (default 'u-boot.bin')
|
|
|
|
This is the U-Boot binary, containing relocation information to allow it
|
|
to relocate itself at runtime. The binary typically includes a device tree
|
|
blob at the end of it.
|
|
|
|
U-Boot can access binman symbols at runtime. See:
|
|
|
|
'Access to binman entry offsets at run time (fdt)'
|
|
|
|
in the binman README for more information.
|
|
|
|
Note that this entry is automatically replaced with u-boot-expanded unless
|
|
--no-expanded is used or the node has a 'no-expanded' property.
|
|
|
|
|
|
|
|
Entry: u-boot-dtb: U-Boot device tree
|
|
-------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot.dtb (default 'u-boot.dtb')
|
|
|
|
This is the U-Boot device tree, containing configuration information for
|
|
U-Boot. U-Boot needs this to know what devices are present and which drivers
|
|
to activate.
|
|
|
|
Note: This is mostly an internal entry type, used by others. This allows
|
|
binman to know which entries contain a device tree.
|
|
|
|
|
|
|
|
Entry: u-boot-dtb-with-ucode: A U-Boot device tree file, with the microcode removed
|
|
-----------------------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot.dtb (default 'u-boot.dtb')
|
|
|
|
See Entry_u_boot_ucode for full details of the three entries involved in
|
|
this process. This entry provides the U-Boot device-tree file, which
|
|
contains the microcode. If the microcode is not being collated into one
|
|
place then the offset and size of the microcode is recorded by this entry,
|
|
for use by u-boot-with-ucode_ptr. If it is being collated, then this
|
|
entry deletes the microcode from the device tree (to save space) and makes
|
|
it available to u-boot-ucode.
|
|
|
|
|
|
|
|
Entry: u-boot-elf: U-Boot ELF image
|
|
-----------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot (default 'u-boot')
|
|
|
|
This is the U-Boot ELF image. It does not include a device tree but can be
|
|
relocated to any address for execution.
|
|
|
|
|
|
|
|
Entry: u-boot-env: An entry which contains a U-Boot environment
|
|
---------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: File containing the environment text, with each line in the
|
|
form var=value
|
|
|
|
|
|
|
|
Entry: u-boot-expanded: U-Boot flat binary broken out into its component parts
|
|
------------------------------------------------------------------------------
|
|
|
|
This is a section containing the U-Boot binary and a devicetree. Using this
|
|
entry type automatically creates this section, with the following entries
|
|
in it:
|
|
|
|
u-boot-nodtb
|
|
u-boot-dtb
|
|
|
|
Having the devicetree separate allows binman to update it in the final
|
|
image, so that the entries positions are provided to the running U-Boot.
|
|
|
|
|
|
|
|
Entry: u-boot-img: U-Boot legacy image
|
|
--------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot.img (default 'u-boot.img')
|
|
|
|
This is the U-Boot binary as a packaged image, in legacy format. It has a
|
|
header which allows it to be loaded at the correct address for execution.
|
|
|
|
You should use FIT (Flat Image Tree) instead of the legacy image for new
|
|
applications.
|
|
|
|
|
|
|
|
Entry: u-boot-nodtb: U-Boot flat binary without device tree appended
|
|
--------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename to include (default 'u-boot-nodtb.bin')
|
|
|
|
This is the U-Boot binary, containing relocation information to allow it
|
|
to relocate itself at runtime. It does not include a device tree blob at
|
|
the end of it so normally cannot work without it. You can add a u-boot-dtb
|
|
entry after this one, or use a u-boot entry instead, normally expands to a
|
|
section containing u-boot and u-boot-dtb
|
|
|
|
|
|
|
|
Entry: u-boot-spl: U-Boot SPL binary
|
|
------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-spl.bin (default 'spl/u-boot-spl.bin')
|
|
|
|
This is the U-Boot SPL (Secondary Program Loader) binary. This is a small
|
|
binary which loads before U-Boot proper, typically into on-chip SRAM. It is
|
|
responsible for locating, loading and jumping to U-Boot. Note that SPL is
|
|
not relocatable so must be loaded to the correct address in SRAM, or written
|
|
to run from the correct address if direct flash execution is possible (e.g.
|
|
on x86 devices).
|
|
|
|
SPL can access binman symbols at runtime. See:
|
|
|
|
'Access to binman entry offsets at run time (symbols)'
|
|
|
|
in the binman README for more information.
|
|
|
|
The ELF file 'spl/u-boot-spl' must also be available for this to work, since
|
|
binman uses that to look up symbols to write into the SPL binary.
|
|
|
|
Note that this entry is automatically replaced with u-boot-spl-expanded
|
|
unless --no-expanded is used or the node has a 'no-expanded' property.
|
|
|
|
|
|
|
|
Entry: u-boot-spl-bss-pad: U-Boot SPL binary padded with a BSS region
|
|
---------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
None
|
|
|
|
This holds the padding added after the SPL binary to cover the BSS (Block
|
|
Started by Symbol) region. This region holds the various variables used by
|
|
SPL. It is set to 0 by SPL when it starts up. If you want to append data to
|
|
the SPL image (such as a device tree file), you must pad out the BSS region
|
|
to avoid the data overlapping with U-Boot variables. This entry is useful in
|
|
that case. It automatically pads out the entry size to cover both the code,
|
|
data and BSS.
|
|
|
|
The contents of this entry will a certain number of zero bytes, determined
|
|
by __bss_size
|
|
|
|
The ELF file 'spl/u-boot-spl' must also be available for this to work, since
|
|
binman uses that to look up the BSS address.
|
|
|
|
|
|
|
|
Entry: u-boot-spl-dtb: U-Boot SPL device tree
|
|
---------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot.dtb (default 'spl/u-boot-spl.dtb')
|
|
|
|
This is the SPL device tree, containing configuration information for
|
|
SPL. SPL needs this to know what devices are present and which drivers
|
|
to activate.
|
|
|
|
|
|
|
|
Entry: u-boot-spl-elf: U-Boot SPL ELF image
|
|
-------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of SPL u-boot (default 'spl/u-boot-spl')
|
|
|
|
This is the U-Boot SPL ELF image. It does not include a device tree but can
|
|
be relocated to any address for execution.
|
|
|
|
|
|
|
|
Entry: u-boot-spl-expanded: U-Boot SPL flat binary broken out into its component parts
|
|
--------------------------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- spl-dtb: Controls whether this entry is selected (set to 'y' or '1' to
|
|
select)
|
|
|
|
This is a section containing the U-Boot binary, BSS padding if needed and a
|
|
devicetree. Using this entry type automatically creates this section, with
|
|
the following entries in it:
|
|
|
|
u-boot-spl-nodtb
|
|
u-boot-spl-bss-pad
|
|
u-boot-dtb
|
|
|
|
Having the devicetree separate allows binman to update it in the final
|
|
image, so that the entries positions are provided to the running U-Boot.
|
|
|
|
This entry is selected based on the value of the 'spl-dtb' entryarg. If
|
|
this is non-empty (and not 'n' or '0') then this expanded entry is selected.
|
|
|
|
|
|
|
|
Entry: u-boot-spl-nodtb: SPL binary without device tree appended
|
|
----------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename to include (default 'spl/u-boot-spl-nodtb.bin')
|
|
|
|
This is the U-Boot SPL binary, It does not include a device tree blob at
|
|
the end of it so may not be able to work without it, assuming SPL needs
|
|
a device tree to operate on your platform. You can add a u-boot-spl-dtb
|
|
entry after this one, or use a u-boot-spl entry instead' which normally
|
|
expands to a section containing u-boot-spl-dtb, u-boot-spl-bss-pad and
|
|
u-boot-spl-dtb
|
|
|
|
SPL can access binman symbols at runtime. See:
|
|
|
|
'Access to binman entry offsets at run time (symbols)'
|
|
|
|
in the binman README for more information.
|
|
|
|
The ELF file 'spl/u-boot-spl' must also be available for this to work, since
|
|
binman uses that to look up symbols to write into the SPL binary.
|
|
|
|
|
|
|
|
Entry: u-boot-spl-with-ucode-ptr: U-Boot SPL with embedded microcode pointer
|
|
----------------------------------------------------------------------------
|
|
|
|
This is used when SPL must set up the microcode for U-Boot.
|
|
|
|
See Entry_u_boot_ucode for full details of the entries involved in this
|
|
process.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl: U-Boot TPL binary
|
|
------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-tpl.bin (default 'tpl/u-boot-tpl.bin')
|
|
|
|
This is the U-Boot TPL (Tertiary Program Loader) binary. This is a small
|
|
binary which loads before SPL, typically into on-chip SRAM. It is
|
|
responsible for locating, loading and jumping to SPL, the next-stage
|
|
loader. Note that SPL is not relocatable so must be loaded to the correct
|
|
address in SRAM, or written to run from the correct address if direct
|
|
flash execution is possible (e.g. on x86 devices).
|
|
|
|
SPL can access binman symbols at runtime. See:
|
|
|
|
'Access to binman entry offsets at run time (symbols)'
|
|
|
|
in the binman README for more information.
|
|
|
|
The ELF file 'tpl/u-boot-tpl' must also be available for this to work, since
|
|
binman uses that to look up symbols to write into the TPL binary.
|
|
|
|
Note that this entry is automatically replaced with u-boot-tpl-expanded
|
|
unless --no-expanded is used or the node has a 'no-expanded' property.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl-bss-pad: U-Boot TPL binary padded with a BSS region
|
|
---------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
None
|
|
|
|
This holds the padding added after the TPL binary to cover the BSS (Block
|
|
Started by Symbol) region. This region holds the various variables used by
|
|
TPL. It is set to 0 by TPL when it starts up. If you want to append data to
|
|
the TPL image (such as a device tree file), you must pad out the BSS region
|
|
to avoid the data overlapping with U-Boot variables. This entry is useful in
|
|
that case. It automatically pads out the entry size to cover both the code,
|
|
data and BSS.
|
|
|
|
The contents of this entry will a certain number of zero bytes, determined
|
|
by __bss_size
|
|
|
|
The ELF file 'tpl/u-boot-tpl' must also be available for this to work, since
|
|
binman uses that to look up the BSS address.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl-dtb: U-Boot TPL device tree
|
|
---------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot.dtb (default 'tpl/u-boot-tpl.dtb')
|
|
|
|
This is the TPL device tree, containing configuration information for
|
|
TPL. TPL needs this to know what devices are present and which drivers
|
|
to activate.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl-dtb-with-ucode: U-Boot TPL with embedded microcode pointer
|
|
----------------------------------------------------------------------------
|
|
|
|
This is used when TPL must set up the microcode for U-Boot.
|
|
|
|
See Entry_u_boot_ucode for full details of the entries involved in this
|
|
process.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl-elf: U-Boot TPL ELF image
|
|
-------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of TPL u-boot (default 'tpl/u-boot-tpl')
|
|
|
|
This is the U-Boot TPL ELF image. It does not include a device tree but can
|
|
be relocated to any address for execution.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl-expanded: U-Boot TPL flat binary broken out into its component parts
|
|
--------------------------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- tpl-dtb: Controls whether this entry is selected (set to 'y' or '1' to
|
|
select)
|
|
|
|
This is a section containing the U-Boot binary, BSS padding if needed and a
|
|
devicetree. Using this entry type automatically creates this section, with
|
|
the following entries in it:
|
|
|
|
u-boot-tpl-nodtb
|
|
u-boot-tpl-bss-pad
|
|
u-boot-dtb
|
|
|
|
Having the devicetree separate allows binman to update it in the final
|
|
image, so that the entries positions are provided to the running U-Boot.
|
|
|
|
This entry is selected based on the value of the 'tpl-dtb' entryarg. If
|
|
this is non-empty (and not 'n' or '0') then this expanded entry is selected.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl-nodtb: TPL binary without device tree appended
|
|
----------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename to include (default 'tpl/u-boot-tpl-nodtb.bin')
|
|
|
|
This is the U-Boot TPL binary, It does not include a device tree blob at
|
|
the end of it so may not be able to work without it, assuming TPL needs
|
|
a device tree to operate on your platform. You can add a u-boot-tpl-dtb
|
|
entry after this one, or use a u-boot-tpl entry instead, which normally
|
|
expands to a section containing u-boot-tpl-dtb, u-boot-tpl-bss-pad and
|
|
u-boot-tpl-dtb
|
|
|
|
TPL can access binman symbols at runtime. See:
|
|
|
|
'Access to binman entry offsets at run time (symbols)'
|
|
|
|
in the binman README for more information.
|
|
|
|
The ELF file 'tpl/u-boot-tpl' must also be available for this to work, since
|
|
binman uses that to look up symbols to write into the TPL binary.
|
|
|
|
|
|
|
|
Entry: u-boot-tpl-with-ucode-ptr: U-Boot TPL with embedded microcode pointer
|
|
----------------------------------------------------------------------------
|
|
|
|
See Entry_u_boot_ucode for full details of the entries involved in this
|
|
process.
|
|
|
|
|
|
|
|
Entry: u-boot-ucode: U-Boot microcode block
|
|
-------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
None
|
|
|
|
The contents of this entry are filled in automatically by other entries
|
|
which must also be in the image.
|
|
|
|
U-Boot on x86 needs a single block of microcode. This is collected from
|
|
the various microcode update nodes in the device tree. It is also unable
|
|
to read the microcode from the device tree on platforms that use FSP
|
|
(Firmware Support Package) binaries, because the API requires that the
|
|
microcode is supplied before there is any SRAM available to use (i.e.
|
|
the FSP sets up the SRAM / cache-as-RAM but does so in the call that
|
|
requires the microcode!). To keep things simple, all x86 platforms handle
|
|
microcode the same way in U-Boot (even non-FSP platforms). This is that
|
|
a table is placed at _dt_ucode_base_size containing the base address and
|
|
size of the microcode. This is either passed to the FSP (for FSP
|
|
platforms), or used to set up the microcode (for non-FSP platforms).
|
|
This all happens in the build system since it is the only way to get
|
|
the microcode into a single blob and accessible without SRAM.
|
|
|
|
There are two cases to handle. If there is only one microcode blob in
|
|
the device tree, then the ucode pointer it set to point to that. This
|
|
entry (u-boot-ucode) is empty. If there is more than one update, then
|
|
this entry holds the concatenation of all updates, and the device tree
|
|
entry (u-boot-dtb-with-ucode) is updated to remove the microcode. This
|
|
last step ensures that that the microcode appears in one contiguous
|
|
block in the image and is not unnecessarily duplicated in the device
|
|
tree. It is referred to as 'collation' here.
|
|
|
|
Entry types that have a part to play in handling microcode:
|
|
|
|
Entry_u_boot_with_ucode_ptr:
|
|
Contains u-boot-nodtb.bin (i.e. U-Boot without the device tree).
|
|
It updates it with the address and size of the microcode so that
|
|
U-Boot can find it early on start-up.
|
|
Entry_u_boot_dtb_with_ucode:
|
|
Contains u-boot.dtb. It stores the microcode in a
|
|
'self.ucode_data' property, which is then read by this class to
|
|
obtain the microcode if needed. If collation is performed, it
|
|
removes the microcode from the device tree.
|
|
Entry_u_boot_ucode:
|
|
This class. If collation is enabled it reads the microcode from
|
|
the Entry_u_boot_dtb_with_ucode entry, and uses it as the
|
|
contents of this entry.
|
|
|
|
|
|
|
|
Entry: u-boot-with-ucode-ptr: U-Boot with embedded microcode pointer
|
|
--------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-nodtb.bin (default 'u-boot-nodtb.bin')
|
|
- optional-ucode: boolean property to make microcode optional. If the
|
|
u-boot.bin image does not include microcode, no error will
|
|
be generated.
|
|
|
|
See Entry_u_boot_ucode for full details of the three entries involved in
|
|
this process. This entry updates U-Boot with the offset and size of the
|
|
microcode, to allow early x86 boot code to find it without doing anything
|
|
complicated. Otherwise it is the same as the u-boot entry.
|
|
|
|
|
|
|
|
Entry: vblock: An entry which contains a Chromium OS verified boot block
|
|
------------------------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- content: List of phandles to entries to sign
|
|
- keydir: Directory containing the public keys to use
|
|
- keyblock: Name of the key file to use (inside keydir)
|
|
- signprivate: Name of provide key file to use (inside keydir)
|
|
- version: Version number of the vblock (typically 1)
|
|
- kernelkey: Name of the kernel key to use (inside keydir)
|
|
- preamble-flags: Value of the vboot preamble flags (typically 0)
|
|
|
|
Output files:
|
|
- input.<unique_name> - input file passed to futility
|
|
- vblock.<unique_name> - output file generated by futility (which is
|
|
used as the entry contents)
|
|
|
|
Chromium OS signs the read-write firmware and kernel, writing the signature
|
|
in this block. This allows U-Boot to verify that the next firmware stage
|
|
and kernel are genuine.
|
|
|
|
|
|
|
|
Entry: x86-reset16: x86 16-bit reset code for U-Boot
|
|
----------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-x86-reset16.bin (default
|
|
'u-boot-x86-reset16.bin')
|
|
|
|
x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
|
|
must be placed at a particular address. This entry holds that code. It is
|
|
typically placed at offset CONFIG_RESET_VEC_LOC. The code is responsible
|
|
for jumping to the x86-start16 code, which continues execution.
|
|
|
|
For 64-bit U-Boot, the 'x86_reset16_spl' entry type is used instead.
|
|
|
|
|
|
|
|
Entry: x86-reset16-spl: x86 16-bit reset code for U-Boot
|
|
--------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-x86-reset16.bin (default
|
|
'u-boot-x86-reset16.bin')
|
|
|
|
x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
|
|
must be placed at a particular address. This entry holds that code. It is
|
|
typically placed at offset CONFIG_RESET_VEC_LOC. The code is responsible
|
|
for jumping to the x86-start16 code, which continues execution.
|
|
|
|
For 32-bit U-Boot, the 'x86_reset_spl' entry type is used instead.
|
|
|
|
|
|
|
|
Entry: x86-reset16-tpl: x86 16-bit reset code for U-Boot
|
|
--------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-x86-reset16.bin (default
|
|
'u-boot-x86-reset16.bin')
|
|
|
|
x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
|
|
must be placed at a particular address. This entry holds that code. It is
|
|
typically placed at offset CONFIG_RESET_VEC_LOC. The code is responsible
|
|
for jumping to the x86-start16 code, which continues execution.
|
|
|
|
For 32-bit U-Boot, the 'x86_reset_tpl' entry type is used instead.
|
|
|
|
|
|
|
|
Entry: x86-start16: x86 16-bit start-up code for U-Boot
|
|
-------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of u-boot-x86-start16.bin (default
|
|
'u-boot-x86-start16.bin')
|
|
|
|
x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
|
|
must be placed in the top 64KB of the ROM. The reset code jumps to it. This
|
|
entry holds that code. It is typically placed at offset
|
|
CONFIG_SYS_X86_START16. The code is responsible for changing to 32-bit mode
|
|
and jumping to U-Boot's entry point, which requires 32-bit mode (for 32-bit
|
|
U-Boot).
|
|
|
|
For 64-bit U-Boot, the 'x86_start16_spl' entry type is used instead.
|
|
|
|
|
|
|
|
Entry: x86-start16-spl: x86 16-bit start-up code for SPL
|
|
--------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of spl/u-boot-x86-start16-spl.bin (default
|
|
'spl/u-boot-x86-start16-spl.bin')
|
|
|
|
x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
|
|
must be placed in the top 64KB of the ROM. The reset code jumps to it. This
|
|
entry holds that code. It is typically placed at offset
|
|
CONFIG_SYS_X86_START16. The code is responsible for changing to 32-bit mode
|
|
and jumping to U-Boot's entry point, which requires 32-bit mode (for 32-bit
|
|
U-Boot).
|
|
|
|
For 32-bit U-Boot, the 'x86-start16' entry type is used instead.
|
|
|
|
|
|
|
|
Entry: x86-start16-tpl: x86 16-bit start-up code for TPL
|
|
--------------------------------------------------------
|
|
|
|
Properties / Entry arguments:
|
|
- filename: Filename of tpl/u-boot-x86-start16-tpl.bin (default
|
|
'tpl/u-boot-x86-start16-tpl.bin')
|
|
|
|
x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code
|
|
must be placed in the top 64KB of the ROM. The reset code jumps to it. This
|
|
entry holds that code. It is typically placed at offset
|
|
CONFIG_SYS_X86_START16. The code is responsible for changing to 32-bit mode
|
|
and jumping to U-Boot's entry point, which requires 32-bit mode (for 32-bit
|
|
U-Boot).
|
|
|
|
If TPL is not being used, the 'x86-start16-spl or 'x86-start16' entry types
|
|
may be used instead.
|
|
|
|
|
|
|