Re: Floppy access by dd fails for 2.6.26-rc2 to final, possibly evenearlier

[Rene Herman]

On 23-07-08 02:46, Gene Heskett wrote:

> On Tuesday 22 July 2008, Wakko Warner wrote:
> > Gene Heskett wrote:
> > > I just been advised by private email that I an not the only one who has
> > > lost the use of his floppy drive via dd.  The corresponder noted that he
> > > had a copy of DSL with a 2.4.something kernel, and his drive worked
> > > flawlessly while booted to DSL.
> > >
> > > So now there are at least 2 floppy users wandering in the wilderness
> > > looking for water.  We need it to support 20 year old computers without a
> > > TCP stack or network cards.
> > I guess I'll chime in.  I'm not sure this is the same problem or not, but my
> > Alpha AS1000a (EV56 5/400) has never successfully been able to read the
> > floppy.  I always get garbage.  The drive does work as I can use the RCU
> > from floppy from the Arc BIOS.
> > Linux sees this device as a 2.88mb floppy.  It is a 1.44mb and the
> > information in the Arc BIOS is set to 1.44mb (I don't think it matters, I
> > boot from SRM, not sure how to set the floppy there)
> >
> > I also do not see any errors or other useful messages in the logs.
> Neither do I. It registers as
> Jul 20 22:56:59 coyote kernel: [   16.297661] Floppy drive(s): fd0 is 1.44M
> Jul 20 22:56:59 coyote kernel: [   16.312758] FDC 0 is a post-1991 82077
>
>
> > Jun  1 15:23:06 narf kernel: [4262383.309846] Floppy drive(s): fd0 is 2.88M
> > Jun  1 15:23:06 narf kernel: [4262383.324494] FDC 0 is a National
> > Semiconductor PC87306
> >
> > I tried forcing to use a specific type:
> > Jun  1 16:21:38 narf kernel: [4194206.301784] floppy0: setting CMOS code to
> > 4 Jun  1 16:21:38 narf kernel: [4194206.301784] Floppy drive(s): fd0 is
> > 1.44M Jun  1 16:21:38 narf kernel: [4194206.314479] FDC 0 is a National
> > Semiconductor PC87306
> >
> > But that failed even worse with errors on sector 0.  (NOTE the floppy was
> > good)
>
> Glad to know I'm not the only one, there are 3 of us now.

Am not reproducing on 2.6.26, so it's at least not just everyone. Normal 
floppy works fine here:

root@7ixe4:~# mkfs.minix /dev/fd0
480 inodes
1440 blocks
Firstdatazone=19 (19)
Zonesize=1024
Maxsize=268966912

root@7ixe4:~# mount /dev/fd0 /mnt/floppy
root@7ixe4:~# echo BAR >/mnt/floppy/FOO
root@7ixe4:~# umount /mnt/floppy
root@7ixe4:~# dd if=/dev/fd0 of=floppy.img
2880+0 records in
2880+0 records out
1474560 bytes (1.5 MB) copied, 48.1893 s, 30.6 kB/s
root@7ixe4:~# mount -o loop floppy.img /mnt/floppy
root@7ixe4:~# cat /mnt/floppy/FOO
BAR
root@7ixe4:~# umount /mnt/floppy
root@7ixe4:~# dd if=floppy.img of=/dev/fd0
2880+0 records in
2880+0 records out
1474560 bytes (1.5 MB) copied, 99.3359 s, 14.8 kB/s
root@7ixe4:~# mount /dev/fd0 /mnt/floppy
root@7ixe4:~# cat /mnt/floppy/FOO
BAR

Rene.
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