Date: Sun, 27 Jul 2003 22:03:57 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: grog@FreeBSD.org Cc: freebsd-mobile@FreeBSD.org Subject: Re: Mapping Video BIOS? Message-ID: <20030727.220357.65159779.imp@bsdimp.com> In-Reply-To: <20030728040157.GP45069@wantadilla.lemis.com> References: <20030728032653.GA37499@wantadilla.lemis.com> <20030727.214235.20045695.imp@bsdimp.com> <20030728040157.GP45069@wantadilla.lemis.com>
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In message: <20030728040157.GP45069@wantadilla.lemis.com>
"Greg 'groggy' Lehey" <grog@FreeBSD.org> writes:
: Sure. The data at offset 0xc0000 are:
:
: C000:0000 55 AA 78 E9 44 06 00 00-00 00 00 00 00 00 00 00 U.x.D...........
:
: The 0xaa55 is the BIOS signature ("Here be a BIOS"), and the 0x78 is
: the length byte (120 sectors, or 60 kB). That's how orm0 knows the
: end address.
:
: > I don't think that it suggests that things are 'unmapped'...
:
: If the area between 0xcc000 and 0xcffff had been mapped, orm0 would
: have found this too:
:
: C000:F000 55 AA 08 E8 6D 0B CB 11-FE 02 00 00 00 00 00 00 U...m...........
08 -> 4k
It could also be that there's a bug in orm that's missing it...
Warner
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