[coreboot] SimNOW debugger syntax help

Myles Watson mylesgw at gmail.com
Tue Oct 21 23:03:56 CEST 2008

> -----Original Message-----
> From: Marc Jones [mailto:Marc.Jones at amd.com]
> Sent: Tuesday, October 21, 2008 2:50 PM
> To: Myles Watson
> Cc: Coreboot; Jordan Crouse
> Subject: Re: SimNOW debugger syntax help
> Myles Watson wrote:
> > Marc, Jordan, or another SimNOW user,
> >
> > f[b|w|d|q] <Address range> <Value> [,[l|p]] Fill physical(default) or
> > linear Memory
> >
> > I wanted to fill the VGA RAM with a pattern, but I can't figure out the
> > syntax for an <Address range>.  It keeps freezing the simulator.  Could
> > you give me an example for filling 1M of memory in physical address
> > space with some pattern?
> >
> > I would have expected the [,[l|p]] to come after the <Address range>
> too.
> >
> > Thanks,
> > Myles
> fd 100000 10001f ,p 5a5a5a5a
> worked for me. You are right about the ,p. I am not sure why it would be
> freezing unless the mem map is really screwed up and it is going
> somewhere bad.

Thanks.  It looks like the IO addresses are getting through to the VGA card,
but I can't find the memory addresses changing for the buffer memory.  This
should help me look.

I set a breakpoint on c0040 since that's the string that gets copied to the
display memory.  The first time it gets accessed is when the ROM gets copied
to c0000, but the next time is the right one.


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