d-i beta3 can't install kernel on a DAC960 (Mylex Acceleraid 150) raid controller

[Alessandro Polverini <alex@nibbles.it>]

Hello,
I did a default install except for manually edit the partition table,
made in this way:

first  : ext3, 3Gb, /
second : swap, 512M
third  : reiserfs, 15Gb, /home

After setting up the system the installer stops telling "Unable to
install the selected kernel".

Looking at the logs in the third console, i see that error:

/usr/sbin/mkinitrd: constituent device /dec/disc0/part1 does not exist
Failed to create inirtd image.

I'm stuck.

Any ideas?

Thanks,
Alex