[NanoBSD] Can't use boot0cfg for changing the booting slice

[John Hein]

Olivier Cochard-Labbé wrote at 17:09 +0200 on Aug  7, 2009:
 > I meet a problem under FreeBSD 7.2 and 8.0-current (nanoBSD) using
 > boot0cfg: I can't use boot0cfg for changing the booting slice.
 > Here is my problem:
 > I'm using the FreeBSD Boot manager on a system with MBR partitions.
 > The active slice is the partition 1, but I want to boot from the slice 2.
 > 
 > Then I use boot0cfg like that:
 > 
 > sysctl kern.geom.debugflags=16
 > boot0cfg -s 2 -v /dev/ad0
 > sysctl kern.geom.debugflags=0
 > 
 > But, after the reboot my system still reboot from the slice 1 (but the
 > boot loader show correctly that the default choice is now the 2)!
 > Where is my problem ?

Are you sure you're booting from slice 1?
Is fstab on slice 2 pointing to slice 1?