Kevin O'Connor <ke...@koconnor.net> wrote: > > 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
Kevin, Why is QEMU disk geometry limited to 16 heads: https://lists.gnu.org/archive/html/qemu-discuss/2015-04/msg00019.html Here is similar discussion about disk image required 32 sectors/track: https://lists.gnu.org/archive/html/qemu-devel/2008-06/msg00380.html The problem is that Qemu takes total number of sectors (based on disk size) and reports maximum allowed PCHS=16383/16/63 which Seabios cannot translate to required LCHS=1024/255/32 under no circumstances because 63 sectors/track is hardcoded. So Volume Boot Record cannot be loaded and thus, Operating System. One more report for your reference: https://www.veritas.com/support/en_US/article.100006632 So it looks like such a disk images cannot be booted under Qemu + Seabios. I realize that it is impossible to make a BIOS to automatically adopt translation to satisfy all use-cases. The only way I see is to provided an alternative build of Seabios where alternative No of sectors/track is used for translation instead of hard-coded value of 63. This might be configured via "make menuconfig" for example. I can work on this if you find it acceptable. -- Mykola Ivanets _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios
