On Fri, Dec 09, 2005 at 06:58:41AM -0500, Jeff Garzik wrote: > If this is for hotswap, as I noted, libata doesn't need this at all. > > If the hardware supports it, then libata will support it directly. > There is no ACPI-specific magic, because ACPI does nothing but talk to > the same hardware libata is talking to. If libata knows how to talk to the random hardware attached to a Dell laptop hotswap bay, I'll be amazed. Ejecting the drive generates a system management interrupt, which then causes the ACPI code to check a register in a block of machine-specific registers and generate an ACPI notification. As far as I can tell, the controller has no say in the matter at all - the Intel specs seem to suggest that ICH6 doesn't generate a hotswap interrupt unless you're using AHCI (which this hardware doesn't). So, as far as I can tell, there /is/ ACPI-specific magic on current-generation hardware. If we're lucky, they'll move to AHCI in future and implement things properly there - but I wouldn't count on it. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
