[4780] in linux-scsi channel archive
Re: AHA1542 and IRQ
daemon@ATHENA.MIT.EDU (Matthias Andree)
Thu Oct 1 13:22:32 1998
Date: Thu, 1 Oct 1998 17:43:51 +0200
From: Matthias Andree <mandree@sx1.HRZ.Uni-Dortmund.DE>
To: linux-scsi@vger.rutgers.edu
Mail-Followup-To: linux-scsi@vger.rutgers.edu
In-Reply-To: <360F6910.80785D65@Altroconsumo.inet.it>; from Michele Nicosia on Mon, Sep 28, 1998 at 11:46:40AM +0100
On Mon, Sep 28, 1998 at 11:46:40AM +0100, Michele Nicosia wrote:
> i'm having trouble with the AHA 1542cf card that do not have the dip
> siwthces for setup irq.I can choose the io address and then when ths
> sytem go up th eirq is autodetectd...BAD.Yes it detect the irq 15 that
> is used buy the ide second channel and so the system says impossible toi
> use or somthing else that irq.I found on the source that the system
> accept parmaters via append of the lilo, but uit doesnt'accept the IRQ,
> it accept the ioaddress, and after tin the source i found that it can
> search itself the right IRQ, 15,14,12,11,9. Ineed to setup it manually,
> to the 9th, but it is possible to do?? where i have to setup it , i
> suppose via lilo, but no info are provided about the irq...please i need
> info.
The Adaptec 1542CF is NOT an ISA Plug & Play card! Linux does however
PROPERLY detect the IRQ that the AHA 1542 uses, which in your case
conflicts with the secondary IDE channel.
There is, however, a way to set the IRQ: boot-up your machine and find
out which interrupts are yet unused (car /proc/interrupts or lsdev),
then shutdown -h and power-down the machine and enable the Adaptec BIOS
(DIP-switches 6 to 8 IIRC). Upon the next boot, you will be offered
"Press CTRL-A for SCSI-Select[tm] utility". Once you see that message,
press CTRL-A and choose Configure Adapter (or similar), you will have
the chance to set the IRQ to (IIRC) 9 .. 12 or 15. Save the settings.
If your Adaptec scans the SCSI bus upon boot while you don't need it,
you can safely disable the advanced configuration options "system boot
controlled by SCSI BIOS" and "dynamically scan bus for devices". You
can as well - after setting and saving the new IRQ - shutdown the
machine again and disable the BIOS by setting the DIP switches
appropriately. See the manual or the bottom side of your Adapter, there
should be a self-adhesive label explaining the switch settings.
--
Matthias Andree
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