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222 lines
6.1 KiB
Plaintext
222 lines
6.1 KiB
Plaintext
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (C) 2018 MediaTek Inc.
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# Ryder Lee <ryder.lee@kernel.org>
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This document describes how to compile the U-Boot and how to change U-Boot
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configuration about the MediaTek SoCs.
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Build Procedure
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===============
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-Set the cross compiler:
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# export CROSS_COMPILE=/path/to/toolchain/arm-linux-gnueabi-
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-Clean-up old residuals:
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# make mrproper
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-Configure the U-Boot:
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# make <defconfig_file>
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# make
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- For the MT7623n bananapi R2 board use "mt7623n_bpir2_defconfig"
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- For the MT7629 reference board use "mt7629_rfb_defconfig"
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Boot sequence
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=============
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-Bootrom -> MTK preloader -> U-Boot
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- MT7623n
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This version of U-Boot doesn't implement SPL. So, MTK preloader binary
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is needed to boot up:
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https://github.com/BPI-SINOVOIP/BPI-R2-bsp/tree/master/mt-pack/mtk/bpi-r2/bin
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-Bootrom -> SPL -> U-Boot
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- MT7629
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Configuration update
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====================
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To update the U-Boot configuration, please refer to doc/README.kconfig
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MediaTek image header
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=====================
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Currently there are two image headers used for MediaTek chips:
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- BootROM image header. This header is used by the first stage bootloader. It records
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the desired compatible boot device, integrity information and its load address.
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The on-chip BootROM will firstly verify integrity and compatibility of the bootloader.
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If verification passed, the BootROM will then load the bootloader into on-chip SRAM,
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and pass control to it.
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Note that this header is actually a combination of three independent headers:
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Device header, BRLYT header and GFH header.
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Used by U-Boot SPL of MT7629 and preloader of MT7623.
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- MediaTek legacy image header. This header was originally used by the legacy image. It
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basically records the load address, image size and image name.
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After all low level initializations passed, the preloader will locate the LK image and
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load it into DRAM, and pass control to it.
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Now this header is used by U-Boot of MT7623.
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To generate these two headers with mkimage:
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# mkimage -T mtk_image -a <load_addr> -n <option_string> -d <input_file> <image_file>
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- mtk_image means using MediaTek's header generation method.
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- load_addr is the load address of this image.
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For first stage bootloader like U-Boot SPL or preloader, it usually points to the
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on-chip SRAM.
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For second stage bootloader like U-Boot, it usually points to the DRAM.
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- option_string contains options to generate the header.
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The option string is using the follow format:
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key1=value1;key2=value2;...
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The following key names are valid:
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lk: If lk=1, LK image header is used. Otherwise BootROM image header is used.
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lkname: The name of the LK image header. The maximum length is 32.
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The default value is "U-Boot".
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media: Desired boot device. The valid values are:
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nand : Parallel NAND
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snand: Serial NAND
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nor : Serial NOR
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emmc : eMMC
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sdmmc: SD
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nandinfo: Desired NAND device type, a combination of page size, oob size and
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optional device capacity. Valid types are:
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2k+64 : for Serial NAND, 2KiB page size + 64B oob size
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2k+120 : for Serial NAND, 2KiB page size + 120B oob size
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2k+128 : for Serial NAND, 2KiB page size + 128B oob size
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4k+256 : for Serial NAND, 4KiB page size + 256B oob size
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1g:2k+64 : for Parallel NAND, 2KiB page size + 64B oob size, total 1Gbit size
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2g:2k+64 : for Parallel NAND, 2KiB page size + 64B oob size, total 2Gbit size
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4g:2k+64 : for Parallel NAND, 2KiB page size + 64B oob size, total 4Gbit size
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2g:2k+128: for Parallel NAND, 2KiB page size + 128B oob size, total 2Gbit size
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4g:2k+128: for Parallel NAND, 2KiB page size + 128B oob size, total 4Gbit size
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MT7629 partitions on Serial NOR
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===============================
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Start End Size Description
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00000000 - 0000ffff: 64KiB U-Boot SPL
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00010000 - 0005ffff: 320KiB U-Boot
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00060000 - 0006ffff: 64KiB U-Boot env / MediaTek NVRAM
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00070000 - 000affff: 256KiB RF calibration data
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000b0000 - xxxxxxxx: all left Firmware image
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BPi-R2 (MT7623N) partitions on SD
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=================================
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Please note that the last two partitions can vary from different Linux distributions
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depending on the MBR partition table.
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Start End Size Description
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00000000 - 000001ff: 512B Device header (with MBR partition table)
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00000200 - 000007ff: 1536B BRLYT header
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00000800 - 0004ffff: 318KiB Preloader (with GFH header)
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00050000 - 000fffff: 704KiB U-Boot
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00100000 - 063fffff: 99MiB Reserved
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06400000 - 163fffff: 256MiB Partition 1 (FAT32)
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16400000 - xxxxxxxx: all left Partition 2 (ext4)
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Upgrading notice on Serial NOR
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==============================
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Example: MT7629
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The command sf is used to operate the Serial NOR device:
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- To probe current NOR flash:
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# sf probe
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- To erase a region:
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# sf erase <offset> <len>
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- To write data to an offset:
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# sf write <data_addr> <offset> <len>
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- To boot kernel:
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# bootm 0x300b0000
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The memory address range 0x30000000 - 0x3fffffff is mapped to the NOR flash.
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The DRAM starts at 0x40000000.
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Please note that the output binary u-boot-mtk.bin is a combination of SPL and U-Boot,
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and it should be write to beginning of the flash.
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Otherwise you should use standalone files:
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spl/u-boot-spl-mtk.bin for SPL,
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u-boot.img for U-Boot.
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Upgrading notice on SD / eMMC
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=============================
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Example: MT7623
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Normally only Preloader and U-Boot can be upgraded within U-Boot, and other partitions
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should be written in PC.
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- To probe current SD card / eMMC:
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# mmc dev 0 for eMMC
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# mmc dev 1 for SD
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- To erase a region:
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# mmc erase <blk_offset> <blk_num>
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- To write data to a block offset:
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# mmc write <data_addr> <blk_offset> <blk_num>
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- To load kernel image from partition 1:
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# fatload mmc 0:1 <load_address> <path_to_kernel_uImage> for eMMC
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# fatload mmc 1:1 <load_address> <path_to_kernel_uImage> for SD
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- To boot kernel:
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# bootm <load_address>
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The DRAM starts at 0x80000000.
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Please note that we use block offset and block count for SD card, not the byte offset.
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The block size is always 512 bytes for SD card.
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Documentation
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=============
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http://wiki.banana-pi.org/Banana_Pi_BPI-R2
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