Some BSD make BIOS calls and may not work with Coreboot.
/***** http://www.coreboot.org/FAQ *******
We have tested some of the BSD OSes and have seen, that FreeBSD for
example
makes BIOS calls, which is not supported by coreboot. Possibly with
help of
SeaBIOS, it may be possible to boot FreeBSD like it is now, but the
right
thing to do, is to remove FreeBSD's dependence on BIOS calls.
...
Please feel free to test booting any of the above using SeaBIOS and
report to
the coreboot mailing list.
***** http://www.coreboot.org/FAQ ********/
Have you tried a Grub2 chainload, with Grub2 as the payload for
libreboot?
https://wiki.gentoo.org/wiki/GRUB2/Chainloading
Best of luck.
On Wednesday 06 May 2015, Oriol Demaria wrote:
So I have tried pretty much everything. ... I'm considering removing
libreboot/coreboot and installing the propietary BIOS, as it seems
there
is no solution for booting OpenBSD there.