bootloader menu to pick a kernel - what is the current situation in in early 2022?

[jpalus]

I'm doing kernel selection for more than a year so it's definitely possible. The biggest obstacle before was lack of display support in uboot but patches existed and since uboot 2021.07 it is mainlined. Things worth checking

1. Try adding "menu label" entry under "label" (if I remember correctly it didn't work without it)
   
2. Check your uboot version (some ancient versions of uboot didn't support extlinux.conf though I would be surprised if it was used for Pinebook Pro)
   
3. Make sure partition with extlinux.conf is used: needs to be marked as active and device holding partition needs to be ordered accordingly in boot_targets var in uboot