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Here is the step-by-step to boot to U-Boot on RK3368-uQ7
Get the Source and build ATF
============================
> git clone git://git.theobroma-systems.com/arm-trusted-firmware.git
> cd arm-trusted-firmware
> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3368 bl31
> cp build/rk3368/release/bl31.bin ../u-boot/bl31-rk3368.bin
Configure U-Boot
================
> cd ../u-boot
> make lion-rk3368_defconfig
Build the TPL/SPL stage
=======================
> make CROSS_COMPILE=aarch64-unknown-elf- ARCH=arm
Build the full U-Boot and a FIT image including the ATF
=======================================================
> make CROSS_COMPILE=aarch64-unknown-elf- ARCH=arm u-boot.itb
Flash the image
===============
Copy the SPL to offset 32k and the FIT image containing the payloads
(U-Boot proper, ATF, devicetree) to offset 256k card.
SD-Card
-------
> dd if=idbloader.img of=/dev/sdb seek=64
> dd if=u-boot.itb of=/dev/sdb seek=512
eMMC
----
rkdeveloptool allows to flash the on-board eMMC via the USB OTG interface with
help of the Rockchip loader binary.
> git clone https://github.com/rockchip-linux/rkdeveloptool
> cd rkdeveloptool
> autoreconf -i && && ./configure && make
> git clone https://github.com/rockchip-linux/rkbin.git
> ./rkdeveloptool db rkbin/rk33/rk3368_loader_v2.00.256.bin
> ./rkdeveloptool wl 64 ../spl.img
> ./rkdeveloptool wl 512 ../u-boot.itb
If everything went according to plan, you should see the following
output on UART0:
<debug_uart> U-Boot TPL board init
Trying to boot from BOOTROM
Returning to boot ROM...
Trying to boot from MMC1
NOTICE: BL31: v1.3(release):v1.2-1320-gbf43a443
NOTICE: BL31: Built : 18:04:47, Jul 5 2017
U-Boot 2017.07-00158-g2395e99858 (Jul 18 2017 - 21:03:31 +0200)
Model: Theobroma Systems RK3368-uQ7 SoM
DRAM: 2 GiB
MMC: dwmmc@ff0c0000: 1, dwmmc@ff0f0000: 0
Using default environment
In: serial@ff180000
Out: serial@ff180000
Err: serial@ff180000
Net:
Warning: ethernet@ff290000 (eth0) using random MAC address - d2:69:35:7e:d0:1e
eth0: ethernet@ff290000
Hit any key to stop autoboot: 2
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