Change in coreboot[master]: mb/lenovo/t440p: Disable second PEG device

[Angel Pons (Code Review)]

Attention is currently required from: Nico Huber, Arthur Heymans, Alexander Couzens, Patrick Rudolph.
Hello Nico Huber, Arthur Heymans, Patrick Rudolph,

I'd like you to do a code review. Please visit

https://review.coreboot.org/c/coreboot/+/55687

to review the following change.

Change subject: mb/lenovo/t440p: Disable second PEG device
......................................................................

mb/lenovo/t440p: Disable second PEG device

PEG bifurcation is strapped to x8/x8 on this board, but only the first
port is used. Disable the PEG device at 00:01.1 because it is unused.

Should fix booting with commit ae999503f62ef8a3b9b2756a2810d29c383a009e
(nb/intel/haswell/pcie.c: Add missing pre-ASPM init). The `config_of()`
function call added in that commit makes coreboot die if any PEG device
that is enabled by strapping is not present in the devicetree. While it
is true that the PEG code should not use `config_of()`, this PEG device
should still be disabled on this board as it is never used.

Change-Id: I16809e081f9a56ba2f1fdfcb4b8289d75161056b
Signed-off-by: Angel Pons 
---
M src/mainboard/lenovo/t440p/devicetree.cb
1 file changed, 1 insertion(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/87/55687/1

diff --git a/src/mainboard/lenovo/t440p/devicetree.cb b/src/mainboard/lenovo/t440p/devicetree.cb
index 1713387..b7588ea 100644
--- a/src/mainboard/lenovo/t440p/devicetree.cb
+++ b/src/mainboard/lenovo/t440p/devicetree.cb
@@ -24,6 +24,7 @@

device pci 00.0 on  end	# Host bridge
    	device pci 01.0 on  end	# PCIe Bridge for discrete graphics
+		device pci 01.1 off end	# Unused PCIe Bridge
    	device pci 02.0 on  end	# Internal graphics VGA controller
    	device pci 03.0 on  end	# Mini-HD audio