On 12/17/2009 12:34 AM, Jeff Garzik wrote:
On 06/17/2008 11:37 PM, 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
---
drivers/pci/quirks.c | 109
+++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 109 insertions(+)
Looking through old emails... did AMD ever confirm the usefulness of
this patch? Is it actually needed in the field? I'm guessing the silence
implies "No"... :)
Well, we only implemented the feature bit displaying for the BOH
"capability" recently, so I guess we wouldn't likely have seen it if
something did advertise it. However, it's true I don't know why any sane
BIOS would want to do this. Can't hurt to have the support, however..
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