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Raspberry firmware used to pass a FDT blob at a fixed address (0x100),
but this is not true anymore. The address now depends on both the
memory size and the blob size [1].
If one wants to passthrough this FDT blob to the kernel, the most
reliable way is to save its address from the r2/x0 register in the
U-Boot entry point and expose it in a environment variable for
further processing.
This patch just does this:
- save the provided address in the global variable fw_dtb_pointer
- expose it in ${fdt_addr} if it points to a a valid FDT blob
There are many different ways to use it. One can, for example, use
the following script which will extract from the tree the command
line built by the firmware, then hand over the blob to a previously
loaded kernel:
fdt addr ${fdt_addr}
fdt get value bootargs /chosen bootargs
bootz ${kernel_addr_r} - ${fdt_addr}
Alternatively, users relying on sysboot/pxe can simply omit any FDT
statement in their extlinux.conf file, U-Boot will automagically pick
${fdt_addr} and pass it to the kernel.
[1] https://www.raspberrypi.org/forums//viewtopic.php?f=107&t=134018
Signed-off-by: Cédric Schieli <cschieli@gmail.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
37 lines
630 B
ArmAsm
37 lines
630 B
ArmAsm
/*
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* (C) Copyright 2016
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* Cédric Schieli <cschieli@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <config.h>
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.align 8
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.global fw_dtb_pointer
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fw_dtb_pointer:
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#ifdef CONFIG_ARM64
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.dword 0x0
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#else
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.word 0x0
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#endif
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/*
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* Routine: save_boot_params (called after reset from start.S)
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* Description: save ATAG/FDT address provided by the firmware at boot time
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*/
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.global save_boot_params
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save_boot_params:
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/* The firmware provided ATAG/FDT address can be found in r2/x0 */
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#ifdef CONFIG_ARM64
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adr x8, fw_dtb_pointer
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str x0, [x8]
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#else
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str r2, fw_dtb_pointer
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#endif
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/* Returns */
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b save_boot_params_ret
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