So I think we should write generic MCFG and ECAM support from scratch
for arm64. Something like this:
- Add an acpi_mcfg_init(), maybe in drivers/acpi/pci_mcfg.c, to be
called from acpi_init() to copy MCFG info to something we can
access after __init. This would not reserve resources, but
probably does have to ioremap() the regions to support
raw_pci_read().
As said, ECAM and ACPI specific code was isolated in previous patch.