TimRiker has run both Debian and Familiar on his TuxScreen.

See pivot_root_to_debian-ARM for more info.

From memory here are the /linuxrc additions:

# look for another root by starting card services
mount -t proc none /proc
/sbin/cardmgr -o

# do we have sbin/init on hda1?
if test -b /dev/hda1 ; then
  mount -t auto /dev/hda1 /mnt
  if test -f /mnt/sbin/init ; then
    umount /proc
    cd /mnt/
    pivot_root . /mnt/initrd
  fi
  umount /mnt
fi

# do we have an ethernet card?
if ifconfig eth0 | grep -i hwaddr ; then
  # change these!
  ifconfig eth0 192.168.0.2 up
  mount -o nolock 192.168.0.1:/shannon /mnt
  if test -f /mnt/sbin/init ; then
    umount /proc
    cd /mnt/
    pivot_root . /mnt/initrd
  fi
  umount /mnt
fi

TimRiker just made these up. Though he has similar code working at home. See the version in CVS:

http://tuxscreen.cvs.sourceforge.net/tuxscreen/buildroot-tux/target_skeleton/linuxrc?view=markup&revision=HEAD