| .. SPDX-License-Identifier: GPL-2.0+ |
| |
| U-Boot for Anbernic RGxx3 Devices |
| ================================= |
| |
| This allows U-Boot to boot the following Anbernic devices: |
| |
| - Anbernic RG353M |
| - Anbernic RG353P |
| - Anbernic RG353V |
| - Anbernic RG353VS |
| - Anbernic RG503 |
| |
| The correct device is detected automatically by comparing ADC values |
| from ADC channel 1. In the event of an RG353V, an attempt is then made |
| to probe for an eMMC and if it fails the device is assumed to be an |
| RG353VS. Based on the detected device, the environment variables |
| "board", "board_name", and "fdtfile" are set to the correct values |
| corresponding to the board which can be read by a boot script to boot |
| with the correct device tree. |
| |
| Please note that there are some versions of the RG353 devices with |
| different panels. Panel auto-detection is planned for a later date. |
| |
| Building U-Boot |
| --------------- |
| |
| .. code-block:: bash |
| |
| $ export CROSS_COMPILE=aarch64-none-elf- |
| $ export BL31=../rkbin/bin/rk35/rk3568_bl31_v1.34.elf |
| $ export ROCKCHIP_TPL=../rkbin/bin/rk35/rk3568_ddr_1056MHz_v1.13.bin |
| $ make anbernic-rgxx3_defconfig |
| $ make |
| |
| This will build ``u-boot-rockchip.bin`` which can be written to an SD |
| card. |
| |
| Image installation |
| ------------------ |
| |
| Write the ``u-boot-rockchip.bin`` to an SD card offset 32kb from the |
| start. |
| |
| .. code-block:: bash |
| |
| $ dd if=u-boot-rockchip.bin of=/dev/mmcblk0 bs=512 seek=64 |