On Sunday, 27 July 2003 at 21:42:35 -0600, M. Warner Losh wrote: > In message: <20030728032653.GA37499_at_wantadilla.lemis.com> > "Greg 'groggy' Lehey" <grog_at_FreeBSD.org> writes: >> On Saturday, 26 July 2003 at 22:18:59 -0600, M. Warner Losh wrote: >>> In message: <20030727015903.GJ45069_at_wantadilla.lemis.com> >>> "Greg 'groggy' Lehey" <grog_at_FreeBSD.org> writes: >>>> Presuming that it's the ROM driver, I get this in the dmesg I posted: >>>> pnpbios: Bad PnP BIOS data checksum >>> >>> That's likely the problem. However, PnP BIOS information isn't the >>> same thing that the orm[sic] driver probes for. >> >> They look related. I've now found the orm output: >> >> orm0: <Option ROMs> at iomem 0xe0000-0xe3fff,0xdf800-0xdffff,0xd0000-0xd17ff,0xc0000-0xcefff on isa0 >> >> The last one is the video BIOS. It's interesting to note that it >> doesn't report the 4 kB BIOS at 0xcf000, which suggests that at this >> point the 16 kB area is already unmapped. > > Hmmmm, The list comes from scanning the "ISA HOLE" for certain memory > signatures. These signatures have a length in them that say "I'm a > rom that's X long". 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........... >> I've worked around the problem by compiling the video BIOS into the X >> server and not trying to access the BIOS in the machine. Obviously >> not a solution, but it works for the moment. I'd really like to track >> down the problem. Does anybody have an idea? > > I don't, I'm sorry. Understood. I was hoping that somebody else might have some ideas. Greg -- See complete headers for address and phone numbers
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