My Libre Computer Renegade wouldn't boot from its pluggable eMMC this morning.  I worked around the issue by booting from an SD card, setting up a chroot environment for the eMMC card, and switching to an older kernel on the eMMC.  Obviously, it would be better if the current kernel supported booting from eMMC.

 

This may be related to

and

 

It's possible that the above (which was on kernel 6.12.9, I believe) was a misdiagnosis of

In any case, the 6.12.11 kernel does boot the Renegade from eMMC, though with the limitation noted in that linked topic.