Hi Jeremy,

Am 05.08.21 um 23:11 schrieb Jeremy Linton:

The PFTF CM4 is an ACPI platform that is following the PCIe SMCCC
standard because its PCIe config space isn't ECAM compliant and is
split into two parts. One part for the root port registers and a
moveable window which points at a given device's 4K config space.
Thus it doesn't have a MCFG (and really any MCFG provided would be
nonsense anyway). As linux doesn't support the PCIe SMCCC standard
we key off a linux specific host bridge _DSD to add custom ECAM
ops and cfgres. The cfg op selects between those two regions, as
well as disallowing problematic accesses, particularly if the link
is down because there isn't an attached device.

i just want to inform you, that i recently submitted the inital patch
series for DT support regarding CM4 [1].

I left out anything related to PCIe (including downstream changes to
pcie-brcmstb).

Best regards
Stefan

[1] - https://marc.info/?l=linux-arm-kernel&m=162782110325813&w=2



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