From owner-freebsd-hackers  Fri May 25  8:56:39 2001
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To: j mckitrick <jcm@freebsd-uk.eu.org>
Subject: Re: removing inb()/outb() from devices 
Cc: freebsd-hackers@FreeBSD.ORG
In-reply-to: Your message of "Fri, 25 May 2001 16:40:34 BST."
		<20010525164033.A21603@dogma.freebsd-uk.eu.org> 
References: <20010525164033.A21603@dogma.freebsd-uk.eu.org>  <20010523171539.A43898@dogma.freebsd-uk.eu.org> <200105250206.f4P26wl39972@billy-club.village.org> 
Date: Fri, 25 May 2001 09:56:45 -0600
From: Warner Losh <imp@village.org>
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In message <20010525164033.A21603@dogma.freebsd-uk.eu.org> j mckitrick writes:
: In the probe routines, the values of the hardware ports are changing from
: one chipset to the next.  Throughout the ppc driver, the regular macros are
: used to access the parallel port control registers, but in the probe routine
: it reverts to inb/outb, probably because it makes no sense to allocate a
: port for 2 or three operations, then deallocate it and choose another one.

Yes, but it does make sense to do that.  Some busses you cannot access
the resources until they have been activated.  pcmcia comes to mind :-).

Warner

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