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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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