Subject: Re: How do I fix "siop0: couldn't map interrupt" on AlphaServer 1000A?
To: Paul Mather <>
From: Chris Rupnik <>
List: port-alpha
Date: 05/26/2003 19:42:46
Hi Paul,
 I would have to say that I have seen a similar problem. On Freebsd (I know,
thats not netbsd) my 2100A cannot probe anything on hose#2, whereas SRM can
see it just fine. I suspect that both Free/Net-BSD are doing the mapping in
a similar fashion.

----- Original Message ----- 
From: "Paul Mather" <>
To: <>
Cc: "Manuel Bouyer" <>
Sent: Monday, May 26, 2003 2:43 PM
Subject: Re: How do I fix "siop0: couldn't map interrupt" on AlphaServer

> On Mon, May 19, 2003 at 10:20:49PM +0200, Manuel Bouyer wrote:
> => > Does anyone know of an
> => > easy fix to get this working?  Will simply moving it to another slot
> =>
> => This is worth a try, it may work. Note that your siop0 is on pci1,
> => all your other devices are on pci0. Try moving it to a slot on pci0,
> => likely a problem with pci1 itself
> Well, I finally got some time to power down and open up the
> AlphaServer 1000A.  The non-working SCSI card was, indeed, plugged
> into a slot on PCI bus 2 (as it is designated on the motherboard).
> Because PCI bus 1 was full, I ended up having to swap the SCSI card
> with one of the two network cards.
> So, now I have two working siop devices (hooray!:), but now only one
> working network device (boo:), and so lose the ability to NAT I was
> providing for an ailing DEC 3000/500S.  Anyway, I can live with that.
> One odd side-effect of switching the cards is that tlp0 and tlp1
> switched around.  I guess anything populating PCI bus 2 gets probed
> before anything on PCI bus 1.  However, it seems that anything plugged
> into PCI bus 2 won't work (at least in this 1000A), because of the
> "unable to map interrupt" problem. :-(
> Does anyone have an AlphaServer 1000A in which cards plugged into PCI
> bus 2 work under NetBSD?  The devices in the one here show up and test
> okay under SRM, BTW.
> Cheers,
> Paul.
> e-mail:
> "Without music to decorate it, time is just a bunch of boring production
>  deadlines or dates by which bills must be paid."
>         --- Frank Vincent Zappa