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Date: Tue, 11 Apr 2006 14:03:37 -0700
From: Maxim Sobolev <sobomax@FreeBSD.org>
Organization: Sippy Software, Inc.
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To: John Baldwin <jhb@FreeBSD.org>
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Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/boot/i386/cdboot cdboot.s
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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.
> 
> http://www.FreeBSD.org/~jhb/patches/pxe_a20.patch

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.

-Maxim