mirror of
https://github.com/u-boot/u-boot.git
synced 2024-12-13 14:53:28 +08:00
1cf99b3626
As documentation is being moved to doc/boards/rockchip create a warning message and remove the redundant list of supported boards. Signed-off-by: Walter Lozano <walter.lozano@collabora.com> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
704 lines
22 KiB
Plaintext
704 lines
22 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (C) 2015 Google. Inc
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# Written by Simon Glass <sjg@chromium.org>
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U-Boot on Rockchip
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==================
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A wide range of Rockchip SoCs are supported in mainline U-Boot
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Warning
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=======
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This document is being moved to doc/board/rockchip, so information on it
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might be incomplete or outdated.
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Prerequisites
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=============
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You will need:
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- Firefly RK3288 board or something else with a supported RockChip SoC
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- Power connection to 5V using the supplied micro-USB power cable
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- Separate USB serial cable attached to your computer and the Firefly
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(connect to the micro-USB connector below the logo)
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- rkflashtool [3]
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- openssl (sudo apt-get install openssl)
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- Serial UART connection [4]
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- Suitable ARM cross compiler, e.g.:
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sudo apt-get install gcc-4.7-arm-linux-gnueabi
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Building
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========
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1. To build RK3288 board:
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CROSS_COMPILE=arm-linux-gnueabi- make O=firefly firefly-rk3288_defconfig all
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(or you can use another cross compiler if you prefer)
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2. To build RK3308 board:
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- Get the rkbin
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=> git clone https://github.com/rockchip-linux/rkbin.git
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- Compile U-Boot
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=> cd /path/to/u-boot
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=> export BL31=/path/to/rkbin/bin/rk33/rk3308_bl31_v2.22.elf
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=> make roc-cc-rk3308_defconfig
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=> make CROSS_COMPILE=aarch64-linux-gnu- all
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=> ./tools/mkimage -n rk3308 -T rksd -d /path/to/rkbin/bin/rk33/rk3308_ddr_589MHz_uart2_m0_v1.26.bin idbloader.img
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=> cat spl/u-boot-spl.bin >> idbloader.img
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3. To build RK3399 board:
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Option 1: Package the image with Rockchip miniloader:
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- Compile U-Boot
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=> cd /path/to/u-boot
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=> make nanopi-neo4-rk3399_defconfig
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=> make
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- Get the rkbin
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=> git clone https://github.com/rockchip-linux/rkbin.git
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- Create trust.img
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=> cd /path/to/rkbin
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=> ./tools/trust_merger RKTRUST/RK3399TRUST.ini
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- Create uboot.img
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=> cd /path/to/rkbin
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=> ./tools/loaderimage --pack --uboot /path/to/u-boot/u-boot-dtb.bin uboot.img
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(Get trust.img and uboot.img)
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Option 2: Package the image with SPL:
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- Export cross compiler path for aarch64
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- Compile ATF
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For Puma board.
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=> git clone git://git.theobroma-systems.com/arm-trusted-firmware.git
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=> cd arm-trusted-firmware
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=> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31
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(export bl31.bin)
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=> export BL31=/path/to/arm-trusted-firmware/build/rk3399/release/bl31/bl31.bin
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For rest of rk3399 boards.
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=> git clone https://github.com/ARM-software/arm-trusted-firmware.git
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=> cd arm-trusted-firmware
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(export cross compiler path for Cortex-M0 MCU likely arm-none-eabi-)
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=> make realclean
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=> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399
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(export bl31.elf)
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=> export BL31=/path/to/arm-trusted-firmware/build/rk3399/release/bl31/bl31.elf
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- Compile PMU M0 firmware
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This is optional for most of the rk3399 boards and required only for Puma board.
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=> git clone git://git.theobroma-systems.com/rk3399-cortex-m0.git
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=> cd rk3399-cortex-m0
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(export cross compiler path for Cortex-M0 PMU)
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=> make CROSS_COMPILE=arm-cortex_m0-eabi-
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(export rk3399m0.bin)
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=> export PMUM0=/path/to/rk3399-cortex-m0/rk3399m0.bin
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- Compile U-Boot
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=> cd /path/to/u-boot
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=> make orangepi-rk3399_defconfig
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=> make
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(Get spl/u-boot-spl-dtb.bin, u-boot.itb images and some boards would get
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spl/u-boot-spl.bin since it doesn't enable CONFIG_SPL_OF_CONTROL
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If TPL enabled on the target, get tpl/u-boot-tpl-dtb.bin or tpl/u-boot-tpl.bin
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if CONFIG_TPL_OF_CONTROL not enabled)
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Writing to the board with USB
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=============================
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For USB to work you must get your board into ROM boot mode, either by erasing
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your MMC or (perhaps) holding the recovery button when you boot the board.
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To erase your MMC, you can boot into Linux and type (as root)
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dd if=/dev/zero of=/dev/mmcblk0 bs=1M
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Connect your board's OTG port to your computer.
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To create a suitable image and write it to the board:
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./firefly-rk3288/tools/mkimage -n rk3288 -T rkimage -d \
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./firefly-rk3288/spl/u-boot-spl-dtb.bin out && \
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cat out | openssl rc4 -K 7c4e0304550509072d2c7b38170d1711 | rkflashtool l
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If all goes well you should something like:
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U-Boot SPL 2015.07-rc1-00383-ge345740-dirty (Jun 03 2015 - 10:06:49)
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Card did not respond to voltage select!
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spl: mmc init failed with error: -17
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### ERROR ### Please RESET the board ###
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You will need to reset the board before each time you try. Yes, that's all
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it does so far. If support for the Rockchip USB protocol or DFU were added
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in SPL then we could in principle load U-Boot and boot to a prompt from USB
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as several other platforms do. However it does not seem to be possible to
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use the existing boot ROM code from SPL.
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Writing to the eMMC with USB on ROC-RK3308-CC
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=============================================
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For USB to work you must get your board into Bootrom mode,
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either by erasing the eMMC or short circuit the GND and D0
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on core board.
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Connect the board to your computer via tyepc.
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=> rkdeveloptool db rk3308_loader_v1.26.117.bin
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=> rkdeveloptool wl 0x40 idbloader.img
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=> rkdeveloptool wl 0x4000 u-boot.itb
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=> rkdeveloptool rd
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Then you will see the boot log from Debug UART at baud rate 1500000:
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DDR Version V1.26
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REGFB: 0x00000032, 0x00000032
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In
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589MHz
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DDR3
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Col=10 Bank=8 Row=14 Size=256MB
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msch:1
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Returning to boot ROM...
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U-Boot SPL 2020.01-rc1-00225-g34b681327f (Nov 14 2019 - 10:58:04 +0800)
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Trying to boot from MMC1
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INFO: Preloader serial: 2
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NOTICE: BL31: v1.3(release):30f1405
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NOTICE: BL31: Built : 17:08:28, Sep 23 2019
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INFO: Lastlog: last=0x100000, realtime=0x102000, size=0x2000
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INFO: ARM GICv2 driver initialized
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INFO: Using opteed sec cpu_context!
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INFO: boot cpu mask: 1
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INFO: plat_rockchip_pmu_init: pd status 0xe b
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INFO: BL31: Initializing runtime services
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WARNING: No OPTEE provided by BL2 boot loader, Booting device without OPTEE initialization. SMC`s destined for OPTEE will rK
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ERROR: Error initializing runtime service opteed_fast
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INFO: BL31: Preparing for EL3 exit to normal world
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INFO: Entry point address = 0x600000
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INFO: SPSR = 0x3c9
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U-Boot 2020.01-rc1-00225-g34b681327f (Nov 14 2019 - 10:58:47 +0800)
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Model: Firefly ROC-RK3308-CC board
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DRAM: 254 MiB
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MMC: dwmmc@ff480000: 0, dwmmc@ff490000: 1
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rockchip_dnl_key_pressed read adc key val failed
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Net: No ethernet found.
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Hit any key to stop autoboot: 0
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Card did not respond to voltage select!
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switch to partitions #0, OK
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mmc1(part 0) is current device
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Scanning mmc 1:4...
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Found /extlinux/extlinux.conf
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Retrieving file: /extlinux/extlinux.conf
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151 bytes read in 3 ms (48.8 KiB/s)
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1: kernel-mainline
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Retrieving file: /Image
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14737920 bytes read in 377 ms (37.3 MiB/s)
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append: earlycon=uart8250,mmio32,0xff0c0000 console=ttyS2,1500000n8
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Retrieving file: /rk3308-roc-cc.dtb
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28954 bytes read in 4 ms (6.9 MiB/s)
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Flattened Device Tree blob at 01f00000
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Booting using the fdt blob at 0x1f00000
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## Loading Device Tree to 000000000df3a000, end 000000000df44119 ... OK
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Starting kernel ...
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[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd042]
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[ 0.000000] Linux version 5.4.0-rc1-00040-g4dc2d508fa47-dirty (andy@B150) (gcc version 6.3.1 20170404 (Linaro GCC 6.3-209
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[ 0.000000] Machine model: Firefly ROC-RK3308-CC board
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[ 0.000000] earlycon: uart8250 at MMIO32 0x00000000ff0c0000 (options '')
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[ 0.000000] printk: bootconsole [uart8250] enabled
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Booting from an SD card
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=======================
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To write an image that boots from an SD card (assumed to be /dev/sdc):
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./firefly-rk3288/tools/mkimage -n rk3288 -T rksd -d \
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firefly-rk3288/spl/u-boot-spl-dtb.bin out && \
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sudo dd if=out of=/dev/sdc seek=64 && \
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sudo dd if=firefly-rk3288/u-boot-dtb.img of=/dev/sdc seek=16384
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This puts the Rockchip header and SPL image first and then places the U-Boot
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image at block 16384 (i.e. 8MB from the start of the SD card). This
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corresponds with this setting in U-Boot:
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#define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR 0x4000
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Put this SD (or micro-SD) card into your board and reset it. You should see
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something like:
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U-Boot 2016.01-rc2-00309-ge5bad3b-dirty (Jan 02 2016 - 23:41:59 -0700)
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Model: Radxa Rock 2 Square
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DRAM: 2 GiB
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MMC: dwmmc@ff0f0000: 0, dwmmc@ff0c0000: 1
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*** Warning - bad CRC, using default environment
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In: serial
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Out: vop@ff940000.vidconsole
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Err: serial
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Net: Net Initialization Skipped
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No ethernet found.
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Hit any key to stop autoboot: 0
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=>
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The rockchip bootrom can load and boot an initial spl, then continue to
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load a second-stage bootloader (ie. U-Boot) as soon as the control is returned
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to the bootrom. Both the RK3288 and the RK3036 use this special boot sequence.
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The configuration option enabling this is:
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CONFIG_SPL_ROCKCHIP_BACK_TO_BROM=y
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You can create the image via the following operations:
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./firefly-rk3288/tools/mkimage -n rk3288 -T rksd -d \
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firefly-rk3288/spl/u-boot-spl-dtb.bin out && \
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cat firefly-rk3288/u-boot-dtb.bin >> out && \
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sudo dd if=out of=/dev/sdc seek=64
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Or:
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./firefly-rk3288/tools/mkimage -n rk3288 -T rksd -d \
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firefly-rk3288/spl/u-boot-spl-dtb.bin:firefly-rk3288/u-boot-dtb.bin \
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out && \
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sudo dd if=out of=/dev/sdc seek=64
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If you have an HDMI cable attached you should see a video console.
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For evb_rk3036 board:
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./evb-rk3036/tools/mkimage -n rk3036 -T rksd -d evb-rk3036/spl/u-boot-spl.bin out && \
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cat evb-rk3036/u-boot-dtb.bin >> out && \
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sudo dd if=out of=/dev/sdc seek=64
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Or:
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./evb-rk3036/tools/mkimage -n rk3036 -T rksd -d \
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evb-rk3036/spl/u-boot-spl.bin:evb-rk3036/u-boot-dtb.bin out && \
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sudo dd if=out of=/dev/sdc seek=64
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Note: rk3036 SDMMC and debug uart use the same iomux, so if you boot from SD, the
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debug uart must be disabled
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Booting from an SD card on RK3288 with TPL
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==========================================
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Since the size of SPL can't be exceeded 0x8000 bytes in RK3288, it is not possible add
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new SPL features like Falcon mode or etc.
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So introduce TPL so-that adding new features to SPL is possible because now TPL should
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run minimal with code like DDR, clock etc and rest of new features in SPL.
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As of now TPL is added on Vyasa-RK3288 board.
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To write an image that boots from an SD card (assumed to be /dev/mmcblk0):
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sudo dd if=idbloader.img of=/dev/mmcblk0 seek=64 &&
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sudo dd if=u-boot-dtb.img of=/dev/mmcblk0 seek=16384
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Booting from an SD card on RK3188
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=================================
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For rk3188 boards the general storage onto the card stays the same as
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described above, but the image creation needs a bit more care.
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The bootrom of rk3188 expects to find a small 1kb loader which returns
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control to the bootrom, after which it will load the real loader, which
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can then be up to 29kb in size and does the regular ddr init. This is
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handled by a single image (built as the SPL stage) that tests whether
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it is handled for the first or second time via code executed from the
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boot0-hook.
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Additionally the rk3188 requires everything the bootrom loads to be
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rc4-encrypted. Except for the very first stage the bootrom always reads
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and decodes 2kb pages, so files should be sized accordingly.
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# copy tpl, pad to 1020 bytes and append spl
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tools/mkimage -n rk3188 -T rksd -d spl/u-boot-spl.bin out
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# truncate, encode and append u-boot.bin
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truncate -s %2048 u-boot.bin
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cat u-boot.bin | split -b 512 --filter='openssl rc4 -K 7C4E0304550509072D2C7B38170D1711' >> out
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Booting from an SD card on Pine64 Rock64 (RK3328)
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=================================================
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For Rock64 rk3328 board the following three parts are required:
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TPL, SPL, and the u-boot image tree blob.
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- Write TPL/SPL image at 64 sector
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=> sudo dd if=idbloader.img of=/dev/mmcblk0 seek=64
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- Write u-boot image tree blob at 16384 sector
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=> sudo dd if=u-boot.itb of=/dev/mmcblk0 seek=16384
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Booting from an SD card on RK3399
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=================================
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To write an image that boots from an SD card (assumed to be /dev/sdc):
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Option 1: Package the image with Rockchip miniloader:
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- Create idbloader.img
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=> cd /path/to/u-boot
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=> ./tools/mkimage -n rk3399 -T rksd -d /path/to/rkbin/bin/rk33/rk3399_ddr_800MHz_v1.20.bin idbloader.img
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=> cat /path/to/rkbin/bin/rk33/rk3399_miniloader_v1.19.bin >> idbloader.img
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- Write idbloader.img at 64 sector
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=> sudo dd if=idbloader.img of=/dev/sdc seek=64
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- Write trust.img at 24576
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=> sudo dd if=trust.img of=/dev/sdc seek=24576
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- Write uboot.img at 16384 sector
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=> sudo dd if=uboot.img of=/dev/sdc seek=16384
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=> sync
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Put this SD (or micro-SD) card into your board and reset it. You should see
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something like:
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DDR Version 1.20 20190314
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In
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Channel 0: DDR3, 933MHz
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Bus Width=32 Col=10 Bank=8 Row=15 CS=1 Die Bus-Width=16 Size=1024MB
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no stride
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ch 0 ddrconfig = 0x101, ddrsize = 0x20
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pmugrf_os_reg[2] = 0x10006281, stride = 0x17
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OUT
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Boot1: 2019-03-14, version: 1.19
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CPUId = 0x0
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ChipType = 0x10, 239
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mmc: ERROR: SDHCI ERR:cmd:0x102,stat:0x18000
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mmc: ERROR: Card did not respond to voltage select!
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emmc reinit
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mmc: ERROR: SDHCI ERR:cmd:0x102,stat:0x18000
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mmc: ERROR: Card did not respond to voltage select!
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emmc reinit
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mmc: ERROR: SDHCI ERR:cmd:0x102,stat:0x18000
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mmc: ERROR: Card did not respond to voltage select!
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SdmmcInit=2 1
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mmc0:cmd5,20
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SdmmcInit=0 0
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BootCapSize=0
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UserCapSize=60543MB
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FwPartOffset=2000 , 0
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StorageInit ok = 45266
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SecureMode = 0
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SecureInit read PBA: 0x4
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SecureInit read PBA: 0x404
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SecureInit read PBA: 0x804
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SecureInit read PBA: 0xc04
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SecureInit read PBA: 0x1004
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SecureInit read PBA: 0x1404
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SecureInit read PBA: 0x1804
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SecureInit read PBA: 0x1c04
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SecureInit ret = 0, SecureMode = 0
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atags_set_bootdev: ret:(0)
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GPT 0x3380ec0 signature is wrong
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recovery gpt...
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GPT 0x3380ec0 signature is wrong
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recovery gpt fail!
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LoadTrust Addr:0x4000
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No find bl30.bin
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Load uboot, ReadLba = 2000
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hdr 0000000003380880 + 0x0:0x88,0x41,0x3e,0x97,0xe6,0x61,0x54,0x23,0xe9,0x5a,0xd1,0x2b,0xdc,0x2f,0xf9,0x35,
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Load OK, addr=0x200000, size=0x9c9c0
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RunBL31 0x10000
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NOTICE: BL31: v1.3(debug):370ab80
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NOTICE: BL31: Built : 09:23:41, Mar 4 2019
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NOTICE: BL31: Rockchip release version: v1.1
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INFO: GICv3 with legacy support detected. ARM GICV3 driver initialized in EL3
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INFO: Using opteed sec cpu_context!
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INFO: boot cpu mask: 0
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INFO: plat_rockchip_pmu_init(1181): pd status 3e
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INFO: BL31: Initializing runtime services
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INFO: BL31: Initializing BL32
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INF [0x0] TEE-CORE:init_primary_helper:337: Initializing (1.1.0-195-g8f090d20 #6 Fri Dec 7 06:11:20 UTC 2018 aarch64)
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INF [0x0] TEE-CORE:init_primary_helper:338: Release version: 1.2
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INF [0x0] TEE-CORE:init_teecore:83: teecore inits done
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INFO: BL31: Preparing for EL3 exit to normal world
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INFO: Entry point address = 0x200000
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INFO: SPSR = 0x3c9
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U-Boot 2019.04-rc4-00136-gfd121f9641-dirty (Apr 16 2019 - 14:02:47 +0530)
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Model: FriendlyARM NanoPi NEO4
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DRAM: 1022 MiB
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MMC: dwmmc@fe310000: 2, dwmmc@fe320000: 1, sdhci@fe330000: 0
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Loading Environment from MMC... *** Warning - bad CRC, using default environment
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In: serial@ff1a0000
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Out: serial@ff1a0000
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Err: serial@ff1a0000
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Model: FriendlyARM NanoPi NEO4
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Net: eth0: ethernet@fe300000
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Hit any key to stop autoboot: 0
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=>
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Option 2: Package the image with SPL:
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- Prefix rk3399 header to SPL image
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=> cd /path/to/u-boot
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=> ./tools/mkimage -n rk3399 -T rksd -d spl/u-boot-spl-dtb.bin out
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- Write prefixed SPL at 64th sector
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=> sudo dd if=out of=/dev/sdc seek=64
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- Write U-Boot proper at 16384 sector
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=> sudo dd if=u-boot.itb of=/dev/sdc seek=16384
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=> sync
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Put this SD (or micro-SD) card into your board and reset it. You should see
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something like:
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U-Boot SPL board init
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Trying to boot from MMC1
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U-Boot 2019.01-00004-g14db5ee998 (Mar 11 2019 - 13:18:41 +0530)
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Model: Orange Pi RK3399 Board
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DRAM: 2 GiB
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MMC: dwmmc@fe310000: 2, dwmmc@fe320000: 1, sdhci@fe330000: 0
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Loading Environment from MMC... OK
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In: serial@ff1a0000
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Out: serial@ff1a0000
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Err: serial@ff1a0000
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Model: Orange Pi RK3399 Board
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Net: eth0: ethernet@fe300000
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Hit any key to stop autoboot: 0
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=>
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Option 3: Package the image with TPL:
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- Write tpl+spl at 64th sector
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=> sudo dd if=idbloader.img of=/dev/sdc seek=64
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- Write U-Boot proper at 16384 sector
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=> sudo dd if=u-boot.itb of=/dev/sdc seek=16384
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=> sync
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Put this SD (or micro-SD) card into your board and reset it. You should see
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something like:
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U-Boot TPL board init
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Trying to boot from BOOTROM
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Returning to boot ROM...
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U-Boot SPL board init
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Trying to boot from MMC1
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U-Boot 2019.07-rc1-00241-g5b3244767a (May 08 2019 - 10:51:06 +0530)
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Model: Orange Pi RK3399 Board
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DRAM: 2 GiB
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MMC: dwmmc@fe310000: 2, dwmmc@fe320000: 1, sdhci@fe330000: 0
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Loading Environment from MMC... OK
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In: serial@ff1a0000
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Out: serial@ff1a0000
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Err: serial@ff1a0000
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Model: Orange Pi RK3399 Board
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Net: eth0: ethernet@fe300000
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Hit any key to stop autoboot: 0
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=>
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Using fastboot on rk3288
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========================
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- Write GPT partition layout to mmc device which fastboot want to use it to
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store the image
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=> gpt write mmc 1 $partitions
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- Invoke fastboot command to prepare
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=> fastboot 1
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- Start fastboot request on PC
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fastboot -i 0x2207 flash loader evb-rk3288/spl/u-boot-spl-dtb.bin
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You should see something like:
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=> fastboot 1
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WARNING: unknown variable: partition-type:loader
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Starting download of 357796 bytes
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..
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downloading of 357796 bytes finished
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Flashing Raw Image
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........ wrote 357888 bytes to 'loader'
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Booting from SPI
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================
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To write an image that boots from SPI flash (e.g. for the Haier Chromebook or
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Bob):
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./chromebook_jerry/tools/mkimage -n rk3288 -T rkspi \
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-d chromebook_jerry/spl/u-boot-spl-dtb.bin spl.bin && \
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dd if=spl.bin of=spl-out.bin bs=128K conv=sync && \
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cat spl-out.bin chromebook_jerry/u-boot-dtb.img >out.bin && \
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dd if=out.bin of=out.bin.pad bs=4M conv=sync
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This converts the SPL image to the required SPI format by adding the Rockchip
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header and skipping every second 2KB block. Then the U-Boot image is written at
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offset 128KB and the whole image is padded to 4MB which is the SPI flash size.
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The position of U-Boot is controlled with this setting in U-Boot:
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#define CONFIG_SYS_SPI_U_BOOT_OFFS 0x20000
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If you have a Dediprog em100pro connected then you can write the image with:
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sudo em100 -s -c GD25LQ32 -d out.bin.pad -r
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When booting you should see something like:
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U-Boot SPL 2015.07-rc2-00215-g9a58220-dirty (Jun 23 2015 - 12:11:32)
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U-Boot 2015.07-rc2-00215-g9a58220-dirty (Jun 23 2015 - 12:11:32 -0600)
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Model: Google Jerry
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DRAM: 2 GiB
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MMC:
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Using default environment
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In: serial@ff690000
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Out: serial@ff690000
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Err: serial@ff690000
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=>
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Future work
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===========
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Immediate priorities are:
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- USB host
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- USB device
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- Run CPU at full speed (code exists but we only see ~60 DMIPS maximum)
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- NAND flash
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- Boot U-Boot proper over USB OTG (at present only SPL works)
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Development Notes
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=================
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There are plenty of patches in the links below to help with this work.
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[1] https://github.com/rkchrome/uboot.git
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[2] https://github.com/linux-rockchip/u-boot-rockchip.git branch u-boot-rk3288
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[3] https://github.com/linux-rockchip/rkflashtool.git
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[4] http://wiki.t-firefly.com/index.php/Firefly-RK3288/Serial_debug/en
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rkimage
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-------
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rkimage.c produces an SPL image suitable for sending directly to the boot ROM
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over USB OTG. This is a very simple format - just the string RK32 (as 4 bytes)
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followed by u-boot-spl-dtb.bin.
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The boot ROM loads image to 0xff704000 which is in the internal SRAM. The SRAM
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starts at 0xff700000 and extends to 0xff718000 where we put the stack.
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rksd
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----
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rksd.c produces an image consisting of 32KB of empty space, a header and
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u-boot-spl-dtb.bin. The header is defined by 'struct header0_info' although
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most of the fields are unused by U-Boot. We just need to specify the
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signature, a flag and the block offset and size of the SPL image.
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The header occupies a single block but we pad it out to 4 blocks. The header
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is encoding using RC4 with the key 7c4e0304550509072d2c7b38170d1711. The SPL
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image can be encoded too but we don't do that.
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The maximum size of u-boot-spl-dtb.bin which the boot ROM will read is 32KB,
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or 0x40 blocks. This is a severe and annoying limitation. There may be a way
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around this limitation, since there is plenty of SRAM, but at present the
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board refuses to boot if this limit is exceeded.
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The image produced is padded up to a block boundary (512 bytes). It should be
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written to the start of an SD card using dd.
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Since this image is set to load U-Boot from the SD card at block offset,
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CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR, dd should be used to write
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u-boot-dtb.img to the SD card at that offset. See above for instructions.
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rkspi
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-----
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rkspi.c produces an image consisting of a header and u-boot-spl-dtb.bin. The
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resulting image is then spread out so that only the first 2KB of each 4KB
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sector is used. The header is the same as with rksd and the maximum size is
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also 32KB (before spreading). The image should be written to the start of
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SPI flash.
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See above for instructions on how to write a SPI image.
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rkmux.py
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--------
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You can use this script to create #defines for SoC register access. See the
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script for usage.
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Device tree and driver model
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----------------------------
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Where possible driver model is used to provide a structure to the
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functionality. Device tree is used for configuration. However these have an
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overhead and in SPL with a 32KB size limit some shortcuts have been taken.
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In general all Rockchip drivers should use these features, with SPL-specific
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modifications where required.
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GPT partition layout
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----------------------------
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Rockchip use a unified GPT partition layout in open source support.
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With this GPT partition layout, uboot can be compatilbe with other components,
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like miniloader, trusted-os, arm-trust-firmware.
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There are some documents about partitions in the links below.
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http://rockchip.wikidot.com/partitions
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--
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Jagan Teki <jagan@amarulasolutions.com>
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27 Mar 2019
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Simon Glass <sjg@chromium.org>
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24 June 2015
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