Bug 23953 - setserial changes irq setting for irq 9
setserial changes irq setting for irq 9
Product: Red Hat Linux
Classification: Retired
Component: setserial (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Tim Waugh
David Lawrence
Depends On:
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Reported: 2001-01-13 11:39 EST by Bill Gorder
Modified: 2007-04-18 12:30 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-10-19 09:03:04 EDT
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Description Bill Gorder 2001-01-13 11:39:24 EST
I have a PCI modem (US Robotics model 3CP5610A).  The bus walk places 
the modem at port 0xd400 and irq 9 (from /proc/pci).  I use setserial 
to set the port and irq values, but setserial changes my irq 9 request 
to irq 2.  The man page for setserial has the statement, "On AT class 
machines, IRQ2 is seen as IRQ9 and Linux will interpret it in this 
way."  This may be fine for AT class machines, but this is disaster for 
PCI - irq 2 is assigned to the process controller for cascade 

This technique for configuring PCI modems is documented at 
http://www.o2.net/~gromitkc/3cp5610.txt with a pointer to this page 
from Red Hat.
Comment 1 Tim Waugh 2001-10-19 09:02:59 EDT
What exactly are the bad effects that you see? 
Comment 2 Tim Waugh 2001-10-19 09:36:49 EDT
Apprently this works fine in 7.1.  Closing.

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