As far as I know, as long as you have device-mapper loaded before udev starts, it should find them fine (i.e., udev is not in and of itself an issue, to the best of my knowledge).
How are you loading device-mapper?
CONFIG_BLK_DEV_DM=y
rebuilt the kernel with lvm and device-mapper built-in. I reboot, I get the same thing I have every time. /etc/dm* doesn't exist which makes sense because my raid set /dev/md0 seems to have vanished.
things are clearly sequenced wrong. I probably need to defer the auto detection of the raid array until after udev comes up. I think the md code runs before the I see the ide detection code come up for the raid drives.
---eric
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