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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" <jmcneill%invisible.ca@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
> 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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