I have created a branch of Pure64 called
UEFI-only. I am working on the UEFI init code there and the branch will be merged into master once I get things stabilized.
As all recent systems use UEFI it doesn't seem useful to continue to support BIOS (or compatibility) mode.
I was able to boot from USB on an Intel NUC and execute some commands that are built into BareMetal-Monitor.
-Ian