Re: RFC: ACPI/scsi/libata integration and hotswap

[Jeff Garzik]

Matthew Garrett wrote:
> On Fri, Dec 09, 2005 at 07:16:43AM -0500, Jeff Garzik wrote:
>
>
> > libata will immediately notice the ejection without ACPI's help.
>
>
> http://linux.yyz.us/sata/sata-status.html claims that ICH6 doesn't 
> support hotswap. The Intel docs seem to say the same thing. Pulling the 
> drive out generates an ACPI interrupt but not a PCI one. I'm really 
> happy to be wrong here, it's just that everything I've been able to find 
> so far suggests that ACPI is the only way to get a notification that the 
> drive has gone missing :)

ICH6 and ICH7 support it just fine, through the normal SATA PHY 
registers.  ICH5 only support it if you are clever :)

Further, although one can detect hot-unplug on ICH5, hotplug is probably 
not detectable without polling or SMI.

	Jeff


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