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      1 Here is the step-by-step to boot to U-Boot on RK3368-uQ7
      2 
      3 Get the Source and build ATF
      4 ============================
      5 
      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
     10 
     11 Configure U-Boot
     12 ================
     13 
     14   > cd ../u-boot
     15   > make lion-rk3368_defconfig
     16 
     17 Build the TPL/SPL stage
     18 =======================
     19 
     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
     23 
     24 Build the full U-Boot and a FIT image including the ATF
     25 =======================================================
     26 
     27   > make CROSS_COMPILE=aarch64-unknown-elf- ARCH=arm u-boot.itb
     28 
     29 Flash the image
     30 ===============
     31 
     32 Copy the SPL to offset 32k and the FIT image containing the payloads
     33 (U-Boot proper, ATF, devicetree) to offset 256k card.
     34 
     35 SD-Card
     36 -------
     37 
     38   > dd if=spl-3368.img of=/dev/sdb seek=64
     39   > dd if=u-boot.itb of=/dev/sdb seek=512
     40 
     41 eMMC
     42 ----
     43 
     44 rkdeveloptool allows to flash the on-board eMMC via the USB OTG interface with
     45 help of the Rockchip loader binary.
     46 
     47   > git clone https://github.com/rockchip-linux/rkdeveloptool
     48   > cd 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
     54 
     55 
     56 If everything went according to plan, you should see the following
     57 output on UART0:
     58 
     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
     65 
     66 
     67 U-Boot 2017.07-00158-g2395e99858 (Jul 18 2017 - 21:03:31 +0200)
     68 
     69 Model: Theobroma Systems RK3368-uQ7 SoM
     70 DRAM:  2 GiB
     71 MMC:   dwmmc@ff0c0000: 1, dwmmc@ff0f0000: 0
     72 Using default environment
     73 
     74 In:    serial@ff180000
     75 Out:   serial@ff180000
     76 Err:   serial@ff180000
     77 Net:
     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
     81