[coreboot] [PATCH] xcshell: serial shell for early debugging

Michael Gold mgold at ncf.ca
Tue Jul 14 18:55:20 CEST 2009

On Tue, Jul 14, 2009 at 08:38:15 -0700, ron minnich wrote:
> I like it. We talked about something like this in v3. How would you
> feel about putting in emergency flash upgrade support :-)

I like the flash upgrade idea, but I'm not sure how to do it yet (in a
generic way).  Any suggestions?

I think it might be possible without any changes by marking the part of
the ROM containing xcshell as cacheable, and then using pokes to rewrite
the rest of the chip.  It would be slow, but a small flash upgrade
program could be uploaded that would do the rest of the work more

My original idea was that one would set up CAR, upload code, and jump to
it; this would allow the system to be extended without having to include
much code.  It doesn't work, at least on my Pentium 3, but the same
thing could be done with RAM once it's initialised (or with flash for
occasional use).

-- Michael
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