1 Here is the step-by-step to boot to U-Boot on RK3368-uQ7
3 Get the Source and build ATF
4 ============================
6 > git clone git://git.theobroma-systems.com/arm-trusted-firmware.git
7 > cd arm-trusted-firmware
8 > make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3368 bl31
9 > cp build/rk3368/release/bl31.bin ../u-boot/bl31-rk3368.bin
15 > make lion-rk3368_defconfig
17 Build the TPL/SPL stage
18 =======================
20 > make CROSS_COMPILE=aarch64-unknown-elf- ARCH=arm
21 > tools/mkimage -n rk3368 -T rksd -d tpl/u-boot-tpl.bin spl-3368.img
22 > cat spl/u-boot-spl-dtb.bin >> spl-3368.img
24 Build the full U-Boot and a FIT image including the ATF
25 =======================================================
27 > make CROSS_COMPILE=aarch64-unknown-elf- ARCH=arm u-boot.itb
32 Copy the SPL to offset 32k and the FIT image containing the payloads
33 (U-Boot proper, ATF, devicetree) to offset 256k card.
38 > dd if=spl-3368.img of=/dev/sdb seek=64
39 > dd if=u-boot.itb of=/dev/sdb seek=512
44 rkdeveloptool allows to flash the on-board eMMC via the USB OTG interface with
45 help of the Rockchip loader binary.
47 > git clone https://github.com/rockchip-linux/rkdeveloptool
49 > autoreconf -i && && ./configure && make
50 > git clone https://github.com/rockchip-linux/rkbin.git
51 > ./rkdeveloptool db rkbin/rk33/rk3368_loader_v2.00.256.bin
52 > ./rkdeveloptool wl 64 ../spl.img
53 > ./rkdeveloptool wl 512 ../u-boot.itb
56 If everything went according to plan, you should see the following
59 <debug_uart> U-Boot TPL board init
60 Trying to boot from BOOTROM
61 Returning to boot ROM...
62 Trying to boot from MMC1
63 NOTICE: BL31: v1.3(release):v1.2-1320-gbf43a443
64 NOTICE: BL31: Built : 18:04:47, Jul 5 2017
67 U-Boot 2017.07-00158-g2395e99858 (Jul 18 2017 - 21:03:31 +0200)
69 Model: Theobroma Systems RK3368-uQ7 SoM
71 MMC: dwmmc@ff0c0000: 1, dwmmc@ff0f0000: 0
72 Using default environment
78 Warning: ethernet@ff290000 (eth0) using random MAC address - d2:69:35:7e:d0:1e
79 eth0: ethernet@ff290000
80 Hit any key to stop autoboot: 2