Kevin O'Connor wrote: > > SeaBIOS can be used for booting legacy OS and also Linux is still using > > CMOS address 0x10 to configure floppy controller. Under these assumptions > > it makes sense to allow boot from CMOS defined floppy drives. > > There was never really a standard for the layout of CMOS nor for the > encoding of floppy type.
Ralf Brown's interrupt list disagrees: --8<-- CMOS.LST ----------R10-------------------------------- CMOS 10h - IBM - FLOPPY DRIVE TYPE Note: a PC having a 5 1/4 1.2 Mb A: drive and a 1.44 Mb B: drive will have a value of 24h in byte 10h. With a single 1.44 drive: 40h. Bitfields for floppy drives A/B types: Bit(s) Description (Table C0007) 7-4 first floppy disk drive type (see #C0008) 3-0 second floppy disk drive type (see #C0008) (Table C0008) Values for floppy drive type: 00h no drive 01h 360 KB 5.25 Drive 02h 1.2 MB 5.25 Drive - note: not listed in PS/2 technical manual 03h 720 KB 3.5 Drive 04h 1.44 MB 3.5 Drive 05h 2.88 MB 3.5 drive 06h-0Fh unused SeeAlso: #C0007 -->8-- > Currently, SeaBIOS doesn't use CMOS for anything when configured for > coreboot mode and I think we should keep it that way. The first either 15 or 48 bytes are explicitly reserved on all coreboot mainboards and coreboot checksums bytes 16-45 when built to use an option table. > If you have a machine with a floppy drive that you'd > like to use with coorboot+SeaBIOS then you can set the "etc/floppy0" > or "etc/floppy1" cbfs files to activate support in SeaBIOS. That's fine, but why reject the de-facto standard method? Kind regards //Peter _______________________________________________ SeaBIOS mailing list -- seabios@seabios.org To unsubscribe send an email to seabios-le...@seabios.org