cvs commit: src/sys/dev/fdc fdc.c

[Pyun YongHyeon]

On Tue, Jul 11, 2006 at 10:56:30PM -0700, Maxim Sobolev wrote:
 > Jung-uk Kim wrote:
 > >On Tuesday 11 July 2006 08:49 pm, Jung-uk Kim wrote:
 > >>jkim        2006-07-12 00:49:47 UTC
 > >>
 > >>  FreeBSD src repository
 > >>
 > >>  Modified files:
 > >>    sys/dev/fdc          fdc.c
 > >>  Log:
 > >>  Assume floppy disk is not inserted when we have exhausted
 > >>retries.  This significantly reduces booting time when there is
 > >>broken floppy disk drive, controller, cable, BIOS, etc.
 > >>  When the floppy controller interface is correctly implemented,
 > >>disk change signal (DSKCHG) is reflected in the Digital Input
 > >>Register (DIR) at 0x3f7. However, there are many cases that the
 > >>signal is unusable.  Moreover, some BIOS does not reserve the port
 > >>at all.  In those cases, the register may not function.
 > >>
 > >>  Revision  Changes    Path
 > >>  1.311     +3 -0      src/sys/dev/fdc/fdc.c
 > >
 > >Linux device driver seems to have 'broken_dcl' boot time option to 
 > >work around this issue, i.e., assuming disk change for every floppy 
 > >disk access, which is quite ugly, IMHO.  Does anybody have better 
 > >idea to fix these cases?
 > 
 > Not really relevant, but who cares about floppy in 2006 when one can buy 
 > 256MB USB flash for the price of the pack of floppies? ;-)
 > 
 > No offense intended, just curious.
 > 

I think it's very valuable boot device for sparc64 and really like
to add fdc(4) for sparc64. The fdc(4) patch I wrote basically worked
but dd(1) performance on Ebus based ultrasparcs was poor when a
single block(512bytes) is used. The same issue was observed on some
old i386 machine too but the root cause is not yet known.

-- 
Regards,
Pyun YongHyeon