On 11/3/2016 12:58 PM, Sinan Kaya wrote:

quoted

quoted

This is the crucial point I have failed to communicate clearly: the
PNP0C02 resource is *always* required, even if the MCFG is correct.

Interesting...

It looks like there is a lot of lessons learnt here from history.

I think this requirement is only true if your system DDR space and PCIe
space overlaps in the memory map. I understand that Intel systems allow
sharing of these two memory ranges. An OS could potentially reclaim this
address range.

If there is no overlap and PCI is not enabled, there can't be any SW entity
to reclaim this space. 

Did I miss something?

For protection, it makes sense to reserve this range. I'm trying to understand
who would claim this range.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.