From: Steve McCrystal 
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@Date: Thu, 24 Jul 2003 18:10:29 CDT
Subject: Re: os2 irq concept question
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** Reply to note from BITDOGER  Thu, 24 Jul 2003
20:22:23 +0000 
 
   
> i thought with my limited past experiences of irq conflicts in 
installing older warp3&4, 
> that os/2 is RRRREEEAAALLLLLYYYY sensitive  to irq conflicts...when i
did a pci-sniffer its 
> said that irq 11 was  shared by 3 periphials and irq 5 was shared by
another 2 periphials,  so 
> how is eCs 1.1 going to see these periphials in RMVIEW or the 
hardware gui list in setup? let 
> alone drive the lan connection that's  on irq 11(or 5)? 
 
I assume you installed Warp3 on ISA hardware. In that case, 3 devices on
IRQ11, for example,   
would be an IRQ conflict. On a PCI bus machine IT IS NOT!  This is how the
PCI bus is designed to   
work, and work it does.  
 
Here's the tail end of the data from the PCI sniffer run on my machine: 
 
IRQ's dedicated to PCI : 11 
The ROM PCI IRQ routing table appears to be OK. 
 
IRQ Summary: IRQs 11,14,15 are used by PCI devices 
Shared IRQs: IRQ 11 is shared by 6 PCI Devices 
 
Note the last line. It is correct, and again, this is how the PCI bus is
intended to work. Forget   
about "conflicts" on the higher IRQs (because they aren't really
what you think they are). Two   
(or more) devices sharing a PCI bus gateway IRQ are being good neighbors,
not combatants. 
 
Regards, 
 
Steve 
 




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