[Skiboot] [PATCH 2/2] phb4: set PBCQ Tunnel BAR for tunneled operations

[Benjamin Herrenschmidt]

On Tue, 2017-11-07 at 14:19 +0100, Philippe Bergheaud wrote:
> 
> I understand that the Tunnel BAR value is chosen by the device logic,
> within the regular BARs assigned to the device at power-on (an entire
> BAR, or a subset). The Tunnel BAR value is fetched by the device driver,
> that passes it to skiboot, to set the PBCQ Tunnel BAR Response register.
> 
> I think that this patch is required. I cannot see how to reverse the
> information flow.

Why would it be chosen by the device ? I don't understand...

Ben.