Cannot boot from initrd into RAID1

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Hi list,

well, I won't bother you with the whole story, so just the important
facts. I have to use initrd because I need to preload the module for the
 SATA Controller (4port Marvell). I have 4 disks with /<root> and a few
other partitions on RAID1 and others on RAID5. I made a raidtab config
and build the arrays with no problems, created fstab an can mount all
partitions from my boot/rescue system just fine. The problem is booting
the system. After loading the SATA module, linuxrc tries to mount
/dev/md0 (which is supposed to be /<root>) and fails with input/output
error. ^D -> rescue shell let me do cat /proc/mdstat wich shows
something like:
<identities>  [raid1 raid5]

but no arrays. I wonder if I need a statically built binary of mdadm or
thelike in initrd to initialize the arrays or should a proper configured
kernel just do fine?

thanks
 Paul

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