On 2017-05-25 10:58:45, Laszlo Ersek wrote:
> 
> If you add a patch to the series where you change the DEPEX of
> PciHostBridgeDxe to
> 
>   gEdkiiIoMmuProtocolGuid OR gEdkiiIoMmuAbsentProtocolGuid
> 
> then the maintainer (Ray or Jiewen I think) will likely reject that
> patch, because afterwards, all platforms that include PciHostBridgeDxe
> would suddenly have to produce gEdkiiIoMmuAbsentProtocolGuid, minimally.

I haven't worked with it, but it does appear that feature PCD's can be
used to conditionally add new depex values.

$ git grep -e '|.*Pcd' -- '*.inf'

I'm not sure if that feature works with depex 'OR'.

Regarding IoMmuAbsent or IoMmuDetectionAttempted, they seem similar.

-Jordan
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