Unable to mount / in read - write mode

Popof Popof popof.fpn at gmail.com
Tue Nov 4 10:57:05 PST 2008

I recently tried to update my FreeBSD 6.0 to FreeBSD 7.0.
I don't know where but I made a mistake and I am always booting on the 6.0
The problem is that I have an error during boot process:

mount option <rw> is unknown
> mount: /dev/ad0s2a : Invalid argument
> Mounting root filesystem rw failed, startup aborted
> Boot interrupted

Its seems that tools have correctly upgraded (man mount let me see that I
use the FreeBSD 7 version of mount) but not the kernel.

Does someone has an idea to allow me to use my filesystem in read write mode

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