On Fri, 14 May 2010 16:32:07 -0700 "H. Peter Anvin" <hpa@xxxxxxxxx> wrote: > On 05/14/2010 04:28 PM, Jesse Barnes wrote: > > On Fri, 14 May 2010 16:20:45 -0700 > > "H. Peter Anvin" <hpa@xxxxxxxxx> wrote: > > > >> On 05/14/2010 03:47 PM, Jesse Barnes wrote: > >>> > >>> Wow and they're using cards that want to use I/O space? Funky. It's > >>> too late to get this into 2.6.34, but that can't be what you were > >>> expecting... I don't see a problem with getting something like this in > >>> for 2.6.35. > >>> > >> > >> Most cards on the market provide I/O BARs as a convenience to legacy > >> BIOSes; they don't need the I/O BAR functionality from inside a > >> full-featured OS. There are a few, key, exceptions, mainly in the form > >> of legacy-interface devices like UARTs and VGA (note that VGA has its > >> own routing bits and is therefore unaffected by this problem.) > > > > Yeah, it's the "legacy" part that I'm questioning. I'm just lamenting > > that it's dying off so slowly... > > > > And yes, VGA is an unfortunate standard. > > > > I'm not lamenting that fact, because my experience is that what ends up > replacing it is often far worse. Consider UARTs -- no MMU dependencies > at all, can be accessed with four lines of assembly, and compare it to > EHCI debug port, the driver for which is over 900 lines in the Linux > kernel -- and that assumes that you're already in flat mode. Heh, you're so old and crufty! -- Jesse Barnes, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
