Date: Mon, 18 Feb 2008 13:30:03 GMT From: Eamon.Roque@arf.fak12.uni-muenchen.de To: freebsd-amd64@FreeBSD.org Subject: Re: amd64/111955: [install] Install CD boot panic due to missing BIOS smap on 5.5 through to 7.0-Current Snapshot 200704 Message-ID: <200802181330.m1IDU3Ud055029@freefall.freebsd.org>
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The following reply was made to PR amd64/111955; it has been noted by GNATS.
From: Eamon.Roque@arf.fak12.uni-muenchen.de
To: "John Baldwin" <jhb@freebsd.org>
Cc: bug-followup@freebsd.org,
Eamon.Roque@arf.fak12.uni-muenchen.de
Subject: Re: amd64/111955: [install] Install CD boot panic due to missing
BIOS smap on 5.5 through to 7.0-Current Snapshot 200704
Date: Mon, 18 Feb 2008 14:06:53 +0100 (CET)
Would the amd64 kernel work the same way?
I was able to boot the x86 cds, although I had to specify the physical
memory size.
The amd64 8.0-Current bootonly cd from Feb.7, 2008 panics as before
because of the failed SMAP call.
HTH
Eamon Roque
> So the SMAP problem is that in the one BIOS I looked at, the SMAP BIOS
> call
> only works from real mode. Even if invoked from virtual 86 mode, the BIOS
> call fails. FreeBSD only calls the BIOS SMAP call from virtual 86 mode
> both
> in the loader and in the i386 kernel. The fix is quite complicated and
> involves rewriting the boot code to invoke BIOS calls from real mode
> rather
> than virtual 86 mode.
>
> --
> John Baldwin
>
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