On Thu, 8 Nov 2007 23:57:48 -0500 Jeff Garzik <jeff@xxxxxxxxxx> wrote: > On Thu, Nov 08, 2007 at 11:44:22PM -0500, Mark Lord wrote: > > Jeff Garzik wrote: > > >On Thu, Nov 08, 2007 at 10:29:37PM -0500, Mark Lord wrote: > > >>And I might even privately patch my own kernels to map the ACHI > > >>BAR in the cases where the BIOS didn't... > > > > > >The inability to do this in the general case is the main reason why > > >AHCI was not unconditionally enabled, even in IDE mode, when it was > > >originally added... :/ > > .. > > > > Yeah, that one's always puzzled me. > > It's just software, so why don't we do it? In the PCI layer, that > > is? > > Ah, but it's not just software: when trying to find bus address > space for the BAR, we don't know if we are stomping on magic hardware > resources the BIOS has conveniently failed to tell us about. > > So while in all likelihood you will have no problem finding a > suitable bus address to use, as a generalized rule it is a far more > difficult proposition. > another thing to test before doing this everywhere is suspend/resume. This would use the hardware in a way the bios doesn't expect, and sadly that kind of thing tends to royally b0rk the suspend/resume code often (but of course not always). -- If you want to reach me at my work email, use arjan@xxxxxxxxxxxxxxx For development, discussion and tips for power savings, visit http://www.lesswatts.org - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
