Re: Linux Post codes during runtime, possibly OT

H. Peter Anvin
2001-01-25T23:11:15Z

"Richard B. Johnson" wrote:
>
> On Thu, 25 Jan 2001, H. Peter Anvin wrote:
>
> > Matthew Dharm wrote:
> > >
> > > It occurs to me that it might be a good idea to pick a different port for
> > > these things. I know a lot of people who want to use port 80h for
> > > debugging data, especially in embedded x86 systems.
> > >
> >
> > Find a safe port, make sure it is tested the hell out of, and we'll
> > consider it.
> >
> > -hpa
> >
>
> You could use the DMA scratch register at 0x19. I'm sure Linux doesn't
> "save" stuff there when setting up the DMA controller.
>

Does that break the BIOS in any way, shape, or form? Again, someone gets
to make a patch and then test the hell out of it... and find the random
Olivetti which hooks the screen up to the A20M# signal and other weird
crap.

-hpa

--
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"Unix gives you enough rope to shoot yourself in the foot."