Here is the step-by-step to boot to U-Boot on rk3368.
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Get miniloader and trust.img form rockchip vendor u-boot source code
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==============================================================================
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> git clone https://github.com/rockchip-linux/u-boot.git rockchip-uboot
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> cd rockchip-uboot
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> make rk3368_defconfig /*chose px5_defconfig if you run a px5 platform here*/
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> ./mkv8.sh
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Compile the upstream U-Boot
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===========================
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> cd u-boot
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> make CROSS_COMPILE=aarch64-linux-gnu- sheep-rk3368_defconfig all
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Package u-boot for miniloader
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================================
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> ../rockchip-uboot/tools/loaderimage --pack --uboot u-boot.bin u-boot.img
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Flash the image by rkdeveloptool
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================================
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rkdeveloptool can get from https://github.com/rockchip-linux/rkdeveloptool.git
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Power on(or reset with RESET KEY) with MASKROM KEY preesed, and then:
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> rkdeveloptool db ./rockchip-uboot/rk3368_loader_v2.00.256.bin
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> rkdeveloptool wl 0x6000 ./rockchip-uboot/trust.img
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> rkdeveloptool wl 0x4000 ./u-boot/u-boot.img
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> rkdeveloptool RD
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You should be able to get U-Boot log message from boot console:
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U-Boot 2017.05-rc3-01094-g9ddd1e8-dirty (May 15 2017 - 15:57:23 +0800)
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Model: Rockchip sheep board
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DRAM: 2 GiB
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MMC: dwmmc@ff0f0000: 0
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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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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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