On Tue, Jun 05, 2018 at 06:09:54PM +0300, Nikolay Ivanets wrote: > > As far as I know, QEMU should be able to tell SeaBIOS the exact > > geometry to use (eg, via qemu -hdachs c,h,s[,t] option). If you're > > not getting the expected behavior, be sure to include the seabios log > > file - see: https://www.seabios.org/Debugging > > > > Here is geometry when I have with patched bios (Windows boot): > drive 0x000f57f0: PCHS=16383/16/63 translation=lba > LCHS=1024/255/32 s=143305920 > > Here is geometry I have with original Seabios (boot fails): > drive 0x000f0bd0: PCHS=16383/16/63 translation=lba > LCHS=1024/255/63 s=143305920 > > Qemu limits what we can specify in CHS to 16383, 16 and 63 > respectively and I don't see any combinations which will perform > necessary translation from PCHS=16383/16/63 to LCHS=1024/255/32.
If I understand it correctly, you're looking for LCHS=1024/255/32. I don't know why QEMU wont let you specify heads=255, but short of doing that, I don't see a way for SeaBIOS to obtain that logical mapping. The disk geometry translation stuff is arcane - the SeaBIOS code is translated from the original Bochs bios code. If it needs to be enhanced, it would require both a qemu patch (to specify the desired translation/geometry) and a seabios patch (to implement it). -Kevin _______________________________________________ SeaBIOS mailing list [email protected] https://mail.coreboot.org/mailman/listinfo/seabios
