can't mount root during freebsd-update 7.0 -> 8.1 on amd64

[joost at jodocus.org]

Hi

I'm trying to upgrade a amd64 box from 7.0-RELEASE to 8.1-RELEASE with
freebsd-update. After the first reboot the 8.1R GENERIC kernel loads (I'm
using a custom kernel, so at this point the generic kernel is loaded
manually)
It then claims it can't mount /

One thing that's odd is that instead of finding ad4s1a it finds ad4a. Same
for the other filesystems. It however can't find init on this device.

Did I miss something important in src/UPDATING?


Thanks


Joost Bekkers