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From: kuku@acds.physik.rwth-aachen.de (Christoph Kukulies)
Newsgroups: comp.unix.bsd
Subject: door open with disk inserted problem (fd.c patch)
Date: 4 Jan 1993 17:05:57 GMT
Organization: I.Physikalisches Institut RWTH-Aachen
Lines: 42
Distribution: world
Message-ID: <1i9qplINN37c@urmel.informatik.rwth-aachen.de>
Reply-To: kuku@acds.physik.rwth-aachen.de
NNTP-Posting-Host: acds.physik.rwth-aachen.de
Keywords: patch fix kludge hack fd.c door open
For about half a year I have been living with a behaviour of the
386BSD floppy driver which showed up in not recognizing the presence
of the fd controller when a disk was inserted and the door was left open.
Booting the fd has never been a problem. I always was blaming
some strange BIOS or hardware property for being responsible until
some genious mind kicked me to perhaps try it with door open and disk removed.
I did and the problem could be worked around. I did not like this workaround,though, because all too often I forget a floppy in the slot and system uptime is a precious resource - you know. Anyway, here is something
what I would not call a patch because it lacks the proper format, but for applying the fix manually, I leave it here for everyone's convenience:
------------------------- file /sys/i386/isa/fd.c --------------------
/*
!* probe for existence of controller
*/
fdprobe(dev)
struct isa_device *dev;
{
fdc = dev->id_iobase;
/* see if it can handle a command */
+ outb(fdc+fdout,0);
+ DELAY(100);
+ outb(fdc+fdout,4);
if (out_fdc(NE7CMD_SPECIFY) < 0) {
fdc = 0;
return(0);
}
out_fdc(0xDF);
out_fdc(2);
return 1;
}
----------------------------------- end of fix --------------------------
--
--Chris
Christoph P. U. Kukulies
kuku@acds.physik.rwth-aachen.de
*** Error code 1
Stop.