Date: Fri, 9 Oct 1998 17:09:35 +0200 (MET DST) From: Christoph Weber-Fahr <listmail@helena.callcenter.systemhaus.net> To: helbig@Informatik.BA-Stuttgart.DE (Wolfgang Helbig) Subject: Re: what's wrong with a1 and irq 2 ? Message-ID: <199810091511.RAA10239@helena.otelo-call.de> In-Reply-To: <199810090803.KAA00546@RVC1.Informatik.BA-Stuttgart.DE> from Wolfgang Helbig at "Oct 9, 98 10:03:16 am"
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Hello,
> > > In theory, yes. But you have to take into account that on some
> > > systems IRQ9 is hardwired on some VGA adaptors. If you can take
> > > an other IRQ it's better not using IRQ9.
> >
> > I'm willing to try it. But... the AVM driver doesn't support IRQ9 either.
> > So again - should it be possible to simply add irq 9 to the probe
> > code in order to make it work (provided nothing else uses that) ?
>
> Please give it a try!
I did (see below).
> There seem to be two different flavours of the
> AVM-card around. Older ones, where you have to jumper the IRQ line
> and newer ones, where the IRQ line is set by software.
It is a revision 2.0 card. 8 bit. It has jumpers for IRQ 2,3,4,5,6,7
and IO 200, 240, 300, 340. (I never saw a newer one. Are those 16-bit
cards ?)
> The newer ones don't support IRQ 9. But it's quite possible that
> your card does support it.
It does, indeed.
Ok, I tried it. The good news is, it works. ISDND doesn't give errors,
I can connect to my internet provider via PPP and am currently running
load tests.
The bad news is, it indeed seems to compete with the vga card for the
interrupt. It seems to win, though, most of the time - the console
appears sluggish with lag times up to a second (while telnet
access works just fine).
Another observation I made is that the card seems to put a heavy interrupt
load on the machine. Top gives an interrupt load of around 10% while the
card is under load, with occasional (rare) peaks up to 50 %. This is
a 486/50 (ISA only) System.
Is this a general problem with this card or is the IRQ 2 issue involved
here ?
> I don't have access to the AVM user manual.
I do. Although it is not clear if the manual came with that particular
card....
> Which IRQs are possible
> according to the AVM docs? If IRQ9 (= IRQ 2) doesn't work, please
> try out some "save" IRQ like IRQ 5, after removing the other card
> which uses this IRQ now.
Unfortunately this would kill the system (it is made up from old and
garbage parts, an undocumented multi-io/ide card blocks irqs 3,4 and 7,
an 8-bit Future-Domain TMC845 SCSI controller occupies irq 5. Two small
hard drives (one IDE, one SCSI) contain the system and a little bit free
space.
(no, it's not "my" system, I've set it up for a for a few friend's club,
mostly from donated parts. Yes, I'll probably go looking for better
parts Real Soon Now (TM) :-)
Regards
Christoph Weber-Fahr
P.S. Should I try to submit a formal 'patch' for the avm driver
to accept IRQ2 (it's utterly trivial) ?
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