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

[![Build u-boot for RK3328](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk3328.yml/badge.svg)](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk3328.yml)
[![Build u-boot for RK3399](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk3399.yml/badge.svg)](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk3399.yml)
[![Build u-boot for RK356x](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk356x.yml/badge.svg)](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk356x.yml)
[![Build u-boot for RK3588](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk3588.yml/badge.svg)](https://github.com/Kwiboo/u-boot-build/actions/workflows/rk3588.yml)

### Source repositories

- [Kwiboo/u-boot-rockchip](https://github.com/Kwiboo/u-boot-rockchip)
- [rockchip-linux/rkbin](https://github.com/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
```

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