[Skiboot] [PATCH 1/2] pci: Add a framework for quirks

[Benjamin Herrenschmidt]

On Mon, 2017-02-20 at 11:04 +1100, Gavin Shan wrote:
> Ok. Thanks for the explanation. It's reasonable to apply the quirk in
> skiboot then. the back-door is LPC to AHB bridge? In PATCH[2/2],
> ast_ahb_readl() is used to check SoC revision from some SCU register.

The iLPC2AHB more precisely. When we close it completely later on we'll
have a different way for skiboot to grab that from the BMC, possibly
via a special MBOX packet.

The Linux driver today uses a second backdoor in the VGA device but
we want to close it.

Cheers,
Ben.