[koi]

Hi I have a problem.
I have a debian etch stable.
I made this setup:
3 hd.
3 x 1 gb for /boot raid 1 (out of lvm)
3 x 15 gb for / raid 5 (lvm)
3 x 20 gb for /home raid 5 (lvm)
3 x 256 mb for swap raid 5 (lvm)

I made all during the installation process. I have used lvm on raid 5 partitions.
I have never used lvm before, "only" raid.

The problem is that i have always recompiled kernel by vanilla sources, and i never used initrd cause the "important" things i am usual to put "built in " in the kernel configuration.

This time, with lvm, it doesn't work:
so: Do I have left something out of the kernel? (is dm-mod the part about lvm, right?) ?
Do I need initrd the same?

The error I get during boot is (after raid is corretly started):
VFS: cannot open root device "mapper/name-of-the-volume" or unknown-block (0,0)
Please append a correct "root=" boot option
md0 (driver?)*
kernel panic not syncing vfs: unable to mount root fs on unknown-block (0,0)

* md0 is the raid 5 metadevice

Thans in advance.