debian sid grub-pc, lvm on raid10, unknown filesystem

[Martin Kraus]

Hello. 
I'm trying to use debian grub-pc 1.96+20090523-1 with lvm root on raid10. Grub
works with LVM over raid1, and grub works over raid10, but LVM over raid10
get's me: 

unknown filesystem

when booting or using grub-probe for testing. The same problem is when using
raid0 over raid1 and LVM. 

I'm building core.img using biosdisk pc raid mdraid lvm ext2 modules, but I
guess until grub-probe works, grub won't work.

I hoped to avoid building separate /boot.

any suggestions?

thanks
mk