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

["Jared D. McNeill" <jmcneill%invisible.ca@localhost>]

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

From: "Jared D. McNeill" <jmcneill%invisible.ca@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: port-amd64-maintainer%netbsd.org@localhost, 
gnats-admin%netbsd.org@localhost, 
 netbsd-bugs%netbsd.org@localhost
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.
 
 Cheers,
 Jared