It worked in the sense that it appeared as /dev/sda but I couldn't actually
use it as a drive - I didn't try scsifmt on it via the emulator (but see
the end of the message).
>
> > > Look for scsifmt.lsm and you'll find my low-level SCSI formatter that I
> > > wrote for Zip drives. I believe that ATAPI even uses the same command
> > > numbers, but failing that, you could always try using the ide-scsi emulation
> > > in the kernel... :)
> >
> > Ok, that could be very useful. At the moment I'm hoping that the LS120
> > supports "FORMAT_UNIT" which should make it very easy.
>
> >From drivers/block/ide-floppy.c:
>
> /*
> * ATAPI floppy drive packet commands
> */
> #define IDEFLOPPY_FORMAT_UNIT_CMD 0x04
>
> Coincidence that it's 0x04, the same as SCSI's FORMAT_UNIT command?
I hadn't noticed until your message that the command bytes are listed
in ide-floppy.c but it isn't a coincidence as ATAPI commands are based
on SCSI commands.
Since it's quite easy to construct a packet command within the kernel I
just added an ioctl command to ide-floppy which sends a FORMAT_UNIT to the
drive. It doesn't work and I get the following error
ide-floppy: hdb: I/O error, pc = 4, key = 5, asc = 24, ascq = 0
however this is actually encouraging because sense key 5/asc 24 means
that there was an error in the command parameter block but the command
_was_ recognised (you get asc=20 back for an invalid command).
I had sent a parameter block of all zeros which is what scsifmt does
so I'm not sure that using the scsi emulation and scsifmt would be
more successful. I don't know if the format command follows the SCSI
standard - I do have some details for a SCSI disk but playing with the
most likely values (interleave mainly) doesn't seem to produce a
result.
So it's back to the drawing board for the moment.
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