Bill XIE has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/31631 )
Change subject: mb/lenovo/t430s: Open PCIe port #5 for Thunderbolt controller ......................................................................
Patch Set 1:
Currently, under Debian GNU/Linux (stable and testing), the Thunderbolt controller is identified as a PCIe switch (each port of the switch is identified as a device, and connected with an internal PCI bus). If a device is coldplugged in Thunderbolt port, the whole PCI subtree containing the Thunderbolt controller will be enumerated successfully, but if a device is hotplugged, only the PCIe port of the controller facing upstream is brought up, without everything behind it.