mountroot prompt in the middle of updating - can't get past it

Boris Samorodov bsam at
Thu Dec 9 07:10:45 UTC 2010

On Wed, 8 Dec 2010 11:49:41 -0800 Kurt Buff wrote:

> All,

> I have a Lenovo T61 with a 100g HD that I dual boot with FreeBSD
> 8.0-STABLE amd64 and Windows XP.

> FBSD is on ad0s2a, with ad0s2b as swap, and XP on ad0s1a.

> Yesterday I booted up FBSD, started xfce4, started a terminal session,
> su'ed to root and did the following - running a generic kernel:

> # cd /usr/src
> # make buildworld
> # make buildkernel
> # make installkernel

> Then I exited xfce4, did sudo shutdown -r now, and got a mountroot
> prompt that I now can't get past.

> I can get to the loader prompt, and lsdev shows the following:

>    cd devices:
>    disk devices:
>          disk0:     BIOS drive C:
>             disk0s1: NTFS/HPFS
>                 disk0s2a:  FFS
>                 disk02sb:  swap

> when I use '?' at the mountroot prompt I get:

>    List of GEOM managed disk devices:
>       acd0
>    Loader variables:
>    vfs.root.mountfrom=ufs:/dev/ad0s2a
>    vfs.root.mountfrom.options=rw

> I've tried entering the following at the mountroot prompt, with no success:
>    ufs:/dev/ad0s2a
>    ufs:/ad0s2a
>    ufs:ad0s2a
>    ffs:/dev/ad0s2a

> and several other variations that I've found while googling, but no
> success anywhere.

> Does anyone have thoughts on how to remedy this?

Just for the last question:
Try to load an old kernel. (Type "boot /boot/kernel.old" at loader

WBR, bsam

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