mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 02:51:00 +00:00
3ba286e0e8
Add a few notes on how to try out the MediaTek support so far. Signed-off-by: Ryder Lee <ryder.lee@mediatek.com> Tested-by: Frank Wunderlich <frank-w@public-files.de> Reviewed-by: Simon Glass <sjg@chromium.org>
221 lines
6.1 KiB
Text
221 lines
6.1 KiB
Text
# SPDX-License-Identifier: GPL-2.0+
|
|
#
|
|
# Copyright (C) 2018 MediaTek Inc.
|
|
# Ryder Lee <ryder.lee@kernel.org>
|
|
|
|
|
|
This document describes how to compile the U-Boot and how to change U-Boot
|
|
configuration about the MediaTek SoCs.
|
|
|
|
|
|
Build Procedure
|
|
===============
|
|
-Set the cross compiler:
|
|
|
|
# export CROSS_COMPILE=/path/to/toolchain/arm-linux-gnueabi-
|
|
|
|
-Clean-up old residuals:
|
|
|
|
# make mrproper
|
|
|
|
-Configure the U-Boot:
|
|
|
|
# make <defconfig_file>
|
|
# make
|
|
|
|
- For the MT7623n bananapi R2 board use "mt7623n_bpir2_defconfig"
|
|
- For the MT7629 reference board use "mt7629_rfb_defconfig"
|
|
|
|
|
|
Boot sequence
|
|
=============
|
|
-Bootrom -> MTK preloader -> U-Boot
|
|
|
|
- MT7623n
|
|
|
|
This version of U-Boot doesn't implement SPL. So, MTK preloader binary
|
|
is needed to boot up:
|
|
|
|
https://github.com/BPI-SINOVOIP/BPI-R2-bsp/tree/master/mt-pack/mtk/bpi-r2/bin
|
|
|
|
|
|
-Bootrom -> SPL -> U-Boot
|
|
|
|
- MT7629
|
|
|
|
|
|
Configuration update
|
|
====================
|
|
To update the U-Boot configuration, please refer to doc/README.kconfig
|
|
|
|
|
|
MediaTek image header
|
|
=====================
|
|
Currently there are two image headers used for MediaTek chips:
|
|
|
|
- BootROM image header. This header is used by the first stage bootloader. It records
|
|
the desired compatible boot device, integrity information and its load address.
|
|
|
|
The on-chip BootROM will firstly verify integrity and compatibility of the bootloader.
|
|
|
|
If verification passed, the BootROM will then load the bootloader into on-chip SRAM,
|
|
and pass control to it.
|
|
|
|
Note that this header is actually a combination of three independent headers:
|
|
Device header, BRLYT header and GFH header.
|
|
|
|
Used by U-Boot SPL of MT7629 and preloader of MT7623.
|
|
|
|
|
|
- MediaTek legacy image header. This header was originally used by the legacy image. It
|
|
basically records the load address, image size and image name.
|
|
|
|
After all low level initializations passed, the preloader will locate the LK image and
|
|
load it into DRAM, and pass control to it.
|
|
|
|
Now this header is used by U-Boot of MT7623.
|
|
|
|
|
|
To generate these two headers with mkimage:
|
|
|
|
# mkimage -T mtk_image -a <load_addr> -n <option_string> -d <input_file> <image_file>
|
|
|
|
- mtk_image means using MediaTek's header generation method.
|
|
|
|
|
|
- load_addr is the load address of this image.
|
|
For first stage bootloader like U-Boot SPL or preloader, it usually points to the
|
|
on-chip SRAM.
|
|
|
|
For second stage bootloader like U-Boot, it usually points to the DRAM.
|
|
|
|
|
|
- option_string contains options to generate the header.
|
|
|
|
The option string is using the follow format:
|
|
key1=value1;key2=value2;...
|
|
|
|
The following key names are valid:
|
|
lk: If lk=1, LK image header is used. Otherwise BootROM image header is used.
|
|
|
|
lkname: The name of the LK image header. The maximum length is 32.
|
|
The default value is "U-Boot".
|
|
|
|
media: Desired boot device. The valid values are:
|
|
nand : Parallel NAND
|
|
snand: Serial NAND
|
|
nor : Serial NOR
|
|
emmc : eMMC
|
|
sdmmc: SD
|
|
|
|
nandinfo: Desired NAND device type, a combination of page size, oob size and
|
|
optional device capacity. Valid types are:
|
|
2k+64 : for Serial NAND, 2KiB page size + 64B oob size
|
|
2k+120 : for Serial NAND, 2KiB page size + 120B oob size
|
|
2k+128 : for Serial NAND, 2KiB page size + 128B oob size
|
|
4k+256 : for Serial NAND, 4KiB page size + 256B oob size
|
|
1g:2k+64 : for Parallel NAND, 2KiB page size + 64B oob size, total 1Gbit size
|
|
2g:2k+64 : for Parallel NAND, 2KiB page size + 64B oob size, total 2Gbit size
|
|
4g:2k+64 : for Parallel NAND, 2KiB page size + 64B oob size, total 4Gbit size
|
|
2g:2k+128: for Parallel NAND, 2KiB page size + 128B oob size, total 2Gbit size
|
|
4g:2k+128: for Parallel NAND, 2KiB page size + 128B oob size, total 4Gbit size
|
|
|
|
|
|
MT7629 partitions on Serial NOR
|
|
===============================
|
|
|
|
Start End Size Description
|
|
00000000 - 0000ffff: 64KiB U-Boot SPL
|
|
00010000 - 0005ffff: 320KiB U-Boot
|
|
00060000 - 0006ffff: 64KiB U-Boot env / MediaTek NVRAM
|
|
00070000 - 000affff: 256KiB RF calibration data
|
|
000b0000 - xxxxxxxx: all left Firmware image
|
|
|
|
|
|
BPi-R2 (MT7623N) partitions on SD
|
|
=================================
|
|
Please note that the last two partitions can vary from different Linux distributions
|
|
depending on the MBR partition table.
|
|
|
|
Start End Size Description
|
|
00000000 - 000001ff: 512B Device header (with MBR partition table)
|
|
00000200 - 000007ff: 1536B BRLYT header
|
|
00000800 - 0004ffff: 318KiB Preloader (with GFH header)
|
|
00050000 - 000fffff: 704KiB U-Boot
|
|
00100000 - 063fffff: 99MiB Reserved
|
|
06400000 - 163fffff: 256MiB Partition 1 (FAT32)
|
|
16400000 - xxxxxxxx: all left Partition 2 (ext4)
|
|
|
|
|
|
Upgrading notice on Serial NOR
|
|
==============================
|
|
Example: MT7629
|
|
|
|
The command sf is used to operate the Serial NOR device:
|
|
|
|
- To probe current NOR flash:
|
|
|
|
# sf probe
|
|
|
|
- To erase a region:
|
|
|
|
# sf erase <offset> <len>
|
|
|
|
- To write data to an offset:
|
|
|
|
# sf write <data_addr> <offset> <len>
|
|
|
|
- To boot kernel:
|
|
|
|
# bootm 0x300b0000
|
|
|
|
The memory address range 0x30000000 - 0x3fffffff is mapped to the NOR flash.
|
|
The DRAM starts at 0x40000000.
|
|
|
|
Please note that the output binary u-boot-mtk.bin is a combination of SPL and U-Boot,
|
|
and it should be write to beginning of the flash.
|
|
|
|
Otherwise you should use standalone files:
|
|
|
|
spl/u-boot-spl-mtk.bin for SPL,
|
|
u-boot.img for U-Boot.
|
|
|
|
|
|
Upgrading notice on SD / eMMC
|
|
=============================
|
|
Example: MT7623
|
|
|
|
Normally only Preloader and U-Boot can be upgraded within U-Boot, and other partitions
|
|
should be written in PC.
|
|
|
|
- To probe current SD card / eMMC:
|
|
|
|
# mmc dev 0 for eMMC
|
|
# mmc dev 1 for SD
|
|
|
|
- To erase a region:
|
|
|
|
# mmc erase <blk_offset> <blk_num>
|
|
|
|
- To write data to a block offset:
|
|
|
|
# mmc write <data_addr> <blk_offset> <blk_num>
|
|
|
|
- To load kernel image from partition 1:
|
|
|
|
# fatload mmc 0:1 <load_address> <path_to_kernel_uImage> for eMMC
|
|
# fatload mmc 1:1 <load_address> <path_to_kernel_uImage> for SD
|
|
|
|
- To boot kernel:
|
|
|
|
# bootm <load_address>
|
|
|
|
The DRAM starts at 0x80000000.
|
|
|
|
Please note that we use block offset and block count for SD card, not the byte offset.
|
|
The block size is always 512 bytes for SD card.
|
|
|
|
|
|
Documentation
|
|
=============
|
|
http://wiki.banana-pi.org/Banana_Pi_BPI-R2
|