Hello lkcl,
(Resending to list, hopefully it makes it this time)
We have a GNU Guix developer who is interested in working on bootloader and general software support in GuixSD for the EOMA68-A20.
If there is still a pre-production unit available, please get in touch so we can work out how to get them set up. I've agreed to finance the hardware.
Thanks, `~Eric Bavier