Eemeli, Look at this commit just added to libreboot: http://git.savannah.gnu.org/cgit/libreboot.git/commit/?id=0c651b42de90173206bcbfc5d5aa4e71e973177f
Can you re-compile with that latest commit, and confirm? This ought to solve that bug "--MORE--Unknown key 0xff detected" but I don't have a macbook21 to test on for confirmation.
I don't monitor this forum regularly, so it's better to confirm via IRC (ping francis7) or send an email to the libreboot mailing list. Thanks!
