Messages in this thread | | | Date | Sat, 22 Dec 2007 09:20:06 -0500 | From | Jeff Garzik <> | Subject | Re: [patch] Make MMCONFIG space (extended PCI config space) a driver opt-in issue |
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Arjan van de Ven wrote: > Hi, > > Linus really wants the extended (4Kb) PCI configuration space (using MCFG acpi table etc) to be opt-in, since there's many issues with it and most drivers don't even use/need it. The idea behind opt-in is that if you don't use it, you don't get to suffer the bugs... > > Booted on my 64 bit test machine; sadly it has a defunct BIOS that doesn't have a working MCFG. > > > From: Arjan van de Ven <arjan@linux.intel.com> > Subject: Make MMCONFIG space a driver opt-in > > There are many issues with using the extended PCI configuration space > (CPU, Chipset and most of all BIOS bugs). This while the vast majority of drivers > and devices don't even use/need to use the memory mapped access methods since they > don't use the config space beyond the traditional 256 bytes. > > This patch makes accessing the extended config space a driver choice, via the > > pci_enable_ext_config(pdev)
Yuck. And, Linus is just being silly. Wait a year then turn on MMCONFIG :) It took PCI MSI a while to mature, but is finally getting there.
Jeff
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