[Soekris] How to make the 5501 recognize the SATA drive?

[Bent]

Hi,

I just got my 5501, but unfortunately I got it without any kind of
documentation. I have found plenty on the Internet, although most of
it is for the 4xxx series.

I cannot make the BIOS recognize the SATA harddrive. It is connected
through a cable kit I got with the box. I know  the HD is running (I
can hear it when I put my ear next to it) but it does not show up in
the BIOS listing given at power-on.

SInce I do not have a system manual I have to ask for help. What
should I do to make the disk recognized?

BTW I have installed a ArchLinux on the HD, using another PC, so there
is something on the disk for the BIOS to sink its teeth into.

KInd regards,

Bent