Date: Tue, 11 Apr 2006 08:18:19 -0400 From: John Baldwin <jhb@freebsd.org> To: Maxim Sobolev <sobomax@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: <200604110818.20705.jhb@freebsd.org> In-Reply-To: <200604110439.k3B4dTOD072774@repoman.freebsd.org> References: <200604110439.k3B4dTOD072774@repoman.freebsd.org>
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On Tuesday 11 April 2006 12:39 am, Maxim Sobolev wrote: > sobomax 2006-04-11 04:39:29 UTC > > FreeBSD src repository > > Modified files: > sys/boot/i386/cdboot cdboot.s > Log: > When enabling A20 put upper limit on amount of time we wait for the > keyboard controller to get ready (65K x ISA access time, visually around 1 > second). If we have wait more than that amount it's likely that the > hardware is a legacy-free one and simply doesn't have keyboard controller > and doesn't require enabling A20 at all. > > This makes cdboot working for MacBook Pro with Boot Camp. You'll probably need to do the same for boot1 and I think BTX. Alternatively, you should see how the loader is handling A20 and do that in the various boot programs instead (I think there's a PR somewhere about using a BIOS call instead of frobbing the keyboard controller directly that supposedly fixes things like USB keyboards in the loader.) =2D-=20 John Baldwin <jhb@FreeBSD.org> =A0<>< =A0http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org
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