Hi,

Attached patch fixes some issues in the floppy disk controller:
- Enhance reset support (external and software)
- Use MAX_FD constant when possible
- Support up to 4 drives if MAX_FD is set to 4
- Fix DOR register, which should be writable at any time
- Let MSR return 0x20 when non-DMA transfer is happening
- Don't assume caller wants to read whole track at once
- Add seek to next sector when in non-DMA mode
- Fix non-DMA write, which was stopping after only 1 byte
- Better handling of status0/status1/status2
- Fix floppy drive in BeOS (FD_CMD_READ_SECTOR/FD_CMD_WRITE_SECTOR)
- Remove sun4m quirk on DOR and IRQ handling

Credits to Stuart Brady to help me to debug some issues...

Changelog v1 to v2:
- Fix non-DMA write, which was stopping after only 1 byte
Changelog v2 to v3:
- Update to current CVS
Changelog v3 to v4:
- Store state in floppy registers instead of another variables
- Better handling of status0/status1/status2
- Fix floppy drive in BeOS (FD_CMD_READ_SECTOR/FD_CMD_WRITE_SECTOR)
- Remove sun4m quirk on DOR and IRQ handling


To Blue Swirl, floppy disk is now read (I can see FD_CMD_READ commands),
but filesystem is still not recognized.
It seems that it tries 3 differents reads, 4 times. Maybe to try to 
recognize 3 filesystems?

Hervé