RE: [Xen-users] floppy problems in dom0

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> I'm using xen-2.0.6 with a 2.6.11.10 kernel in dom0 on a dual 
> Athon machine. In dom0, I have problems accessing the floppy 
> drive. Most time sectors can be read, but very slowly due to 
> timeouts etc., and sometimes a sector fails alltogether.

It would be interesting to know what happens if you try the unstable
tree (after a make uninstall).

The floppy driver in xen linux is PIO mode only -- DMA can't be used as
the memory pages may be above the 16MB ISA DMA zone.

Ian
 
> First I thought that the disk itself is damaged, but a few 
> tries later (several disks in 3 floppy drives) I realized 
> that the dom0 kernel must have some kind of problem... All 
> the disks work in all drives except in the one in the Xen 
> machine. I see the following kernel messages in my syslog:
> 
>   floppy0: unexpected interrupt
>   floppy0: sensei repl[0]=80
>   floppy0: -- FDC reply errorfloppy0: unexpected interrupt
>   floppy0: sensei repl[0]=80
>   floppy0: -- FDC reply errorfloppy0: unexpected interrupt
>   floppy0: sensei repl[0]=80
>   floppy0: -- FDC reply errorfloppy0: unexpected interrupt
>   floppy0: sensei repl[0]=80 
>   
>   floppy driver state
>   -------------------
>   now=5458913 last interrupt=5458633 diff=280 last called 
> handler=00000000
>   timeout_message=floppy start
>   last output bytes:
>   e6 80 5458595
>   0 90 5458595
>   1b 90 5458595
>   0 90 5458595
>   a 90 5458595
>   2 90 5458595
>   12 90 5458595
>   1b 90 5458595
>   ff 90 5458595
>   e6 80 5458613
>   0 90 5458613
>   1b 90 5458613
>   0 90 5458613
>   c 90 5458613
>   2 90 5458613
>   12 90 5458613
>   1b 90 5458613
>   ff 90 5458613
>   8 90 5458633
>   8 80 5458633
>   last result at 5458633
>   last redo_fd_request at 5458613
>   80
>   status=80
>   fdc_busy=1
>   cont=c02c6d44
>   current_req=cb917838
>   command_status=-1
>   
>   floppy0: floppy timeout called
>   end_request: I/O error, dev fd0, sector 983
> 
> (sector numbers vary, of course)
> 
> Looks somehow like is has to do with interrupts, right? :) I 
> also wonder that the floppy irq has a really high counter in 
> /proc/interrupts. It increments by 17055 just by mounting the 
> disk (ext2 filesystem). Isn't that much too much?
> 
> Anybody know this effect or have a solution?
> 
> Roman
> (please Cc replies to me, I'm not subscribed to the list)
> 
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