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Re: port-amd64/38682: PCI_BUS_FIXUP is missing from amd64 port

The following reply was made to PR port-amd64/38682; it has been noted by GNATS.

From: "Jared D. McNeill" <>
Subject: Re: port-amd64/38682: PCI_BUS_FIXUP is missing from amd64 port
Date: Sun, 18 May 2008 10:25:49 -0400

 Andrew Doran wrote:
 >  It would be nice to do this by default. A comment from Linux
 >  drivers/pci/setup-bus.c:
 >  138    PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
 >  139    requires that if there is no I/O ports or memory behind the
 >  140    bridge, corresponding range must be turned off by writing base
 >  141    value greater than limit to the bridge's base/limit registers.
 >  How does it fail at run time without the FIXUP option?
 Without my patch and FIXUP option, the bridge only has i/o accesses 
 enabled, so cbb and fwohci can't map mem space.
 FYI I moved bus and addr fixup options to x86 last night, and I'm now 
 running a kernel with PCI_BUS_FIXUP and PCI_ADDR_FIXUP instead of the 
 patch posted in the PR.
 If you want to turn on those two options by default, I'm all for it.

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