Date: Wed, 25 Sep 1996 13:01:35 -0700 From: David Greenman <dg@root.com> To: "Mike Durian" <durian@plutotech.com> Cc: Stefan Esser <se@ZPR.Uni-Koeln.DE>, Bruce Evans <bde@zeta.org.au>, freebsd-hackers@freebsd.org Subject: Re: Special Cycles on the PCI bus Message-ID: <199609252001.NAA07021@root.com> In-Reply-To: Your message of "Wed, 25 Sep 1996 13:20:36 MDT." <199609251920.NAA22022@pluto.plutotech.com>
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>On Wed, 25 Sep 1996 20:06:25 +0200, Stefan Esser <se@zpr.uni-koeln.de> wrote: >> >>Well, but those are only used for config space accesses, >>and config space is normally not touched at all, after >>the PCI probe and attach are complete. > > I tracked down those accesses to 0xfca0. They are completely >normal. That is just where the ahc's I/O space got mapped. >The accesses were caused by the code in aic7xxx.c:ahc_scsi_cmd(). Hmmm, this is starting to get interesting to me. This also happens to be the same place where we've seen hangs on P6 machines when doing lots of ahc disk I/O. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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