From owner-freebsd-mobile  Wed Oct 11 17:32:54 2000
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To: Wesley Morgan <morganw@chemicals.tacorp.com>
Cc: freebsd-mobile@freebsd.org, yergeau@gloworm.Stanford.EDU
Subject: Re: FW: Linksys 10/100 PCMCIA card 
In-reply-to: Your message of "Wed, 11 Oct 2000 18:14:50 -0400."
             <Pine.BSF.4.21.0010111812130.93169-100000@volatile.chemicals.tacorp.com> 
Date: Wed, 11 Oct 2000 17:32:43 -0700
From: Dan Yergeau <yergeau@gloworm.Stanford.EDU>
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AFAICT, pccardd uses the free IRQ pool information specified in
/etc/defaults/pccard.conf, /etc/pccard.conf, or via the "-I"
argument to pccardd.  It does not query
the kernel for conflicts.  I don't even think that there is a way
for a user-level program to query the kernel to see which IRQ's have
been assigned to any device, but I'm not a kernel hacker.

The code for IRQ selection in
/usr/src/usr.sbin/pccard/pccardd/cardd.c:assign_driver() is

	/* Allocate a free IRQ if none has been specified */
	if (conf->irq == 0) {
		int     i;
		for (i = 1; i < 16; i++)
			if (pool_irq[i]) {
				conf->irq = i;
				pool_irq[i] = 0;
				break;
			}
		if (conf->irq == 0) {
			logmsg("Failed to allocate IRQ for %s\n", cp->manuf);
			return (NULL);
		}
	}

In any case, ensuring that there aren't IRQ conflicts seems to be
currently left up to the user.  This is discussed in the old PAO FAQ
(http://www.jp.FreeBSD.org/PAO/) and in messages in the
freebsd-mobile archives.  It just doesn't appear to be mentioned
loud enough in the documentation.


Dan


>Just some input -- I found that my PCMPC100v2 card was continually
>assigned an irq that did not work, thus i was forced for manually
>configure it based on the settings it was given under windows. I guess
>that the OS does not test for irq conflicts with the other subsystems (in
>my case it was conflicting with the built-in modem).


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