Re: Mapping Video BIOS?
Greg 'groggy' Lehey <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.mobile,gmane.os.freebsd.current |
|---|---|
| Organization | The FreeBSD Project |
| Message-ID | <[email protected]> |
On Sunday, 27 July 2003 at 22:03:57 -0600, M. Warner Losh wrote: > In message: <[email protected]> > "Greg 'groggy' Lehey" <[email protected]> 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 Correct. It should have shown a BIOS from 0xcf000 to 0xcffff > It could also be that there's a bug in orm that's missing it... Sure, but given the other indications, that's not so likely. Greg -- See complete headers for address and phone numbers
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