From owner-freebsd-questions  Fri Jun 22 13:40:50 2001
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From: "Drew Derbyshire" <avatar+pop3@kew.com>
To: <questions@freebsd.org>
Subject: AHC and memory mapped I/O?
Date: Fri, 22 Jun 2001 16:40:37 -0400
Organization: Kendra Electronic Wonderworks (http://www.kew.com/kendra)
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From LINT ...

# The aic7xxx driver will attempt to use memory mapped I/O for all PCI
# controllers that have it configured only if this option is set.
Unfortunately,
# this doesn't work on some motherboards, which prevents it from being the
# default.
options         AHC_ALLOW_MEMI

How much does this help performance, and more importantly, how does one know
if it DOESN'T work on a machine?

-ahd-


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