NanoPI R6S with OpenWRT

[antoncycle]

@dsouza

Anyway, is there anyway to configure OpenWrt U-Boot to prioritize booting from SD if one is present? This is the default behavior of OEM FriendlyWrt and it is pretty useful.

Installing OpenWrt with the emmc friendlywrt tool will retain the ability to boot from the SD card, using dd to install it will remove that behavior.