Armbian Buster (5.4.6) - eMMC slot not being detected

Better to ask on Armbian forum? It seems that this patch:
https://github.com/armbian/build/blob/master/patch/kernel/rockchip64-current/board-roc-rk3399-pc-fix-disable-hs400.patch
needs to be applied to Rocpi 4 as well.