1Here is the step-by-step to boot U-Boot on rv1108 evb. 2 3Get ddr init binary 4============================================================================== 5 > git clone https://github.com/rockchip-linux/rkbin.git 6 7Compile U-Boot 8=========================== 9 > make CROSS_COMPILE=arm-linux-gnueabi- evb-rv1108_defconfig all 10 > ./tools/mkimage -n rv1108 -T rksd -d ../rkbin/rv1x/rv1108ddr_v1.00.bin spl.bin 11 > cat spl.bin u-boot.bin > u-boot.img 12 13Flash the image by rkdeveloptool 14================================ 15rkdeveloptool can get from https://github.com/rockchip-linux/rkdeveloptool.git 16 17Power on(or reset with RESET KEY) with MASKROM KEY preesed, and then: 18 > rkdeveloptool db ./rkbin/rv1x/rv1108usbboot_v1.00.bin 19 > rkdeveloptool wl 0x40 u-boot.img 20 > rkdeveloptool RD 21 22You should be able to get U-Boot log message from boot console: 23 24DDR Version V1.02 20170220 25In 26400MHz 27DDR3 28Bus Width=16 Col=10 Bank=8 Row=15 CS=1 Die Bus-Width=16 Size=512MB 29mach:2 30OUT 31 32 33U-Boot 2017.05-00693-g3a5b171 (Jun 01 2017 - 17:37:53 +0800) 34 35Model: Rockchip RV1108 Evaluation board 36DRAM: 128 MiB 37APLL: 600000000 DPLL:792000000 GPLL:384000000 38MMC: 39Using default environment 40 41In: serial@10210000 42Out: serial@10210000 43Err: serial@10210000 44Net: No ethernet found. 45Hit any key to stop autoboot: 0 46=> 47