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SubjectRe: epic100 in current -ac kernels
On Fri, 9 Feb 2001, Francois Romieu wrote:

> ARND BERGMANN <std7652@et.FH-Osnabrueck.DE> écrit :
> > On Thu, 8 Feb 2001, Francois Romieu wrote:
> >
> > > >
> > > > Working epic100 drivers:
> > > > - 2.4.0
> > > > - 2.4.0-ac9
> > >
> > > Could you give a look at ac12 (fine here) ?
> > >
> > No, does not work, same problem.
> The modifications between ac9 and ac12 come from the new DMA
> mapping.
What about 2.4.0-ac5? That had the same problem as -ac12. Did it also have
the new DMA mapping?

> They added a bug for the (already buggy ?) big-endian
> machines. I would be surprised that something has *always* been
> missing in the driver and your hardware triggers it*. IMHO the culprit
> is to be found elsewhere.
Yes, I'm pretty sure the problem is not only the epic100 driver, now that
I have done some more investigation. With the broken drivers (I tried
2.4.0-ac12 and 2.4.1-ac5), something generates an enourmous amount of
interrupts as soon as I run 'ifconfig eth0 up'. Within 10 seconds, I got
roughly 950000 interrupts on IRQ11, instead of 30!
After disabling the usb-uhci (I was using the JE driver) in the BIOS
setup, the system reproducibly locked up hard a few seconds after
'ifconfig eth0 up' instead of just getting slow.
Unfortunately, I have no way to also disable the sound card, but at least
it does not make a change if the sound driver is loaded or not.

> I'd like to know what it's worth to share an irq with a pio audio card.
On Monday I can ask the system administrator for the keys so I can open
the machine and put the card into another slot. Right now, USB, sound and
network are hardwired to the same IRQ, that's how the system arrived here.

Arnd <><

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