Tejun Heo wrote:
ahci 1.2 has an exciting! new feature called BIOS/OS handoff which
basically is there to allow BIOS to keep tinkering with the controller
even after OS starts executing. I have no idea what this is useful
for but it's there and we need to do it.
This patch implements the handoff as FIXUP_HEADER as the controller
needs to be claimed before the OS changes any configuration including
IRQ routing.
I'm yet to see any controller which actually requires this, so it's
not for inclusion yet. Maybe keep this in a separate branch?
RFC, DON'T COMMIT
We probably need to do this...
it's not a controller requirement but a BIOS one, so in theory even an
existing, deployed AHCI 1.2 platform could suddenly require BIOS/OS
handoff, if a BIOS update suddenly starts doing new and weird stuff in SMI.
Note that we need to do BIOS/OS handoff upon resume as well as at boot time.
Jeff
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