I don't really have a question, but just wanted to report I tried out the generic UEFI arm64 image on a Pinebook Pro, and it installed emmc and booted just fine!
This was possible because I had installed Tow-Boot to the SPI flash, which supports UEFI booting.
I had tried using the Pinebook Pro build of armbian, which worked fine when booting off the sdcard, but installing it to the emmc wasn't working.
I'm using Tow-Boot 2021.10 then arbmian image Armbian_22.08.7_Uefi-arm64_jammy_current_5.15.74 .
There's a few rough edges in the grub menu, but it boots the OS off the emmc just fine.
Should the be mentioned on the Pinebook Pro page? Personally, having Tow-Boot installed to SPI is all around a much more "normal" laptop experience, so it seems like a good idea in general.
morganwahl got a reaction from TRS-80 in Pinebook Pro working with generic arm64 UEFI image