cvs commit: src/sys/boot/i386/cdboot cdboot.s

John Baldwin jhb at
Tue Apr 11 22:27:50 UTC 2006

On Tuesday 11 April 2006 17:03, Maxim Sobolev wrote:
> John Baldwin wrote:
> > On Tuesday 11 April 2006 10:34, Maxim Sobolev wrote:
> >> boo1 does the same - timeout loop. My small research seemingly suggests 
> >> that doing A20 via the BIOS is not very reliable and may not work on all 
> >> machines.
> > 
> > Can you test a patch for pxeboot?  It looks to be the one other place that
> > goes near the A20 line.
> > 
> >
> Done. Returning to the subject, loader's version of A20-enabling routine 
> suffers from the very same problem (libi386/gatea20.c), but luckily we 
> don't use this routing in the loader at all. I suspect that it relies on 
> A20 being enabled by previous boot stages.

Did you test it for the non-legacy case as well? :-P  I already took
care of the loader's A20 hack. :)

John Baldwin <jhb at>  <><
"Power Users Use the Power to Serve"  =

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