u-boot-build

GitHub Actions workflows to build u-boot for a few Rockchip boards.

Source repositories

• Kwiboo/u-boot-rockchip
• rockchip-linux/rkbin

Produced artifacts

• u-boot-rockchip.bin for use with SD card or eMMC module
• u-boot-rockchip-spi.bin for use with SPI flash

These files contain idbloader.img and u-boot.itb at their expected offsets.

Flashing

SD card or eMMC module

Write the u-boot-rockchip.bin image to sector 64 of a SD card or eMMC module (assumed to be /dev/mmcblk0):

dd if=u-boot-rockchip.bin of=/dev/mmcblk0 bs=32k seek=1 conv=fsync

eMMC using U-Boot cmdline

• Put u-boot-rockchip.bin on first partition of a SD card.
• Run from U-Boot cmdline:

# Read u-boot-rockchip.bin from first partition of a SD card
load mmc 1:1 10000000 u-boot-rockchip.bin

# Change to eMMC
mmc dev 0

# Write 10 MiB (0x5000 blocks) at sector 64 (0x40)
mmc write $fileaddr 40 5000

SPI flash

Write the u-boot-rockchip-spi.bin image to begining of SPI flash (assumed to be /dev/mtd0) using flashcp:

flashcp -v -p u-boot-rockchip-spi.bin /dev/mtd0

Or using U-Boot cmdline:

• Put u-boot-rockchip-spi.bin on first partition of a SD card.
• Run from U-Boot cmdline:

# Initialize SPI flash
sf probe

# Read u-boot-rockchip-spi.bin from first partition of a SD card
load mmc 1:1 10000000 u-boot-rockchip-spi.bin

# Write to begining of SPI flash
sf update $fileaddr 0 $filesize

Erase U-Boot from SPI flash (assumed to be /dev/mtd0) using flash_erase:

flash_erase /dev/mtd0 0 16

Or erase using U-Boot cmdline:

# Initialize SPI flash
sf probe

# Erase first 64 KiB (0x10000 bytes) of SPI flash
sf erase 0 +10000