> > Take the ACPI handle, go look for _GTF, _SDD etc and believe the > > firmware. Nothing else works. > > Actually, that's dangerous. For example, you must not do _STM/_GTM on > ahci becuase _STM/_GTM access PCI config registers which must not be > accessed in achi modes and some BIOSen supply the same _STM/_GTM nodes > whether the controller is in ata_piix mode or ahci mode. Also, on ICH8, > the association gets quite weird due to PCI device splitting. You can end up with _SDD methods for SFF format controllers (or what we think of as SFF format controllers) when we don't have the knowledge to drive them in their full super-whizzo method (eg Marvell) > The ACPI spec says the layout is dependent on controller interface and I > can see reasons why we need to follow that but not the other way > around. Do you have counter-examples? The first problem is the words "the spec". Agreed that STM/GTM are not safe except when expected (and not always safe when they are) but that ought to be ok as we then set all the modes properly ourselves afterwards. - 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
