[Soekris] BIOS update 4801

[schule]

Hello,

since I updated from 1.27 to 1.28 FreeBSD doesn´t boot anymore.
The hdd is recognized as primary master.
I can boot manually by typing "boot 80", but I dont´t know what to
set, to boot automatically.
It seems, that the manual isn´t up to date, and some parts are missing.
Anyhow I couldn´t find something about the parameters "BootPartition"
and "BootDrive".
any hints?

greets