Date: Thu, 30 Jul 1998 07:43:46 -0500 (CDT) From: Mike Isely <isely@enteract.com> To: Doug Ledford <dledford@dialnet.net> Cc: Mike Isely <isely@pobox.com>, Chris Pirih <proverbs@wolfenet.com>, aic7xxx Mailing List <AIC7xxx@FreeBSD.ORG>, rgb@phy.duke.edu Subject: Re: Puzzle for Doug... Message-ID: <Pine.BSI.3.95.980730073543.20193A-100000@nathan.enteract.com> In-Reply-To: <35C02F51.AE4D577C@dialnet.net>
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On Thu, 30 Jul 1998, Doug Ledford wrote:
> Mike Isely wrote:
>
> > Note that in order for this theory to be right, such an access has to get
> > past the system's page tables first.
>
> Which should never happen and is outside the control of the aic7xxx driver
> anyway.
Except page mapping (on x86 at least) has a 4KB granularity. Are
memory-mapped PCI devices required to address-decode the entire 4KB? Or
does that chipset "know" that such a 4KB block is all "device" and
therefore doesn't try to parity-check any of it? Perhaps the aic7xxx
software is accessing a device register which happens to not exist on the
aic7890. Well that's probably a stretch.
I'll be quiet now...
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