Warn when a device took longer than usual to appear.
Use the PDS bit to detect if a root port has a downstream
device connected and warn if enumeration failed.
Test: On Lenovo X220 all PCIe device are visible, thus the
added code path is never taken.
Change-Id: I86b498b89d672b239d9951e116dc3680030666a6
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78229
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2fcef78ff8