Date: Tue, 11 Apr 2006 14:03:37 -0700 From: Maxim Sobolev <sobomax@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/boot/i386/cdboot cdboot.s Message-ID: <443C19A9.1000108@FreeBSD.org> In-Reply-To: <200604111358.41929.jhb@freebsd.org> References: <200604110439.k3B4dTOD072774@repoman.freebsd.org> <200604110818.20705.jhb@freebsd.org> <443BBE7F.6060906@FreeBSD.org> <200604111358.41929.jhb@freebsd.org>
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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
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