installed ATA RAID, now cannot boot - get mountroot prompt

[Lowell Gilbert]

"DA Forsyth" <iwrTech at iwr.ru.ac.za> writes:

> I'm searching the web for answers on this too, but so far nothing 
> useful.  hard to know what question to ask the search engines!

"I made a mistake in rc.conf, or another startup file, and now I
cannot edit it because the filesystem is read-only. What should I do?"
http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/admin.html#RCCONF-READONLY