Patrick Rudolph has posted comments on this change. ( https://review.coreboot.org/19818 )
Change subject: sb/intel/bd82x6x: Disable unused bridges ......................................................................
Patch Set 3:
On my x200/ICH9 all SB PCIe functions seem to support hotplug. How is the situation on bd82x6x?
All ports support hotplug. But you won't use all of them. For that reason you can select which of them are used (for Express card) by using a devicetree array. On my board with current devixetree, no ports would be disabled as two are in use and one is marked hotplug let. It's only useful if you remove on the PCIe devices (like WiFi card).