[coreboot-gerrit] Change in ...coreboot[master]: soc/skl: set IGD resources only if device is enabled

[Maxim Polyakov (Code Review)]

Hello Patrick Rudolph, Angel Pons, Matt DeVillier, Paul Menzel, build bot (Jenkins), Nico Huber, Patrick Georgi,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/32467

to look at the new patch set (#3).

Change subject: soc/skl: set IGD resources only if device is enabled
......................................................................

soc/skl: set IGD resources only if device is enabled

If the Intel IGD device pci 02.0 is disabled or undefined in
the device tree, then internal graphics pre-allocated memory
and GFX-VT MMIO memory for virtualization won`t be allocated
in the SoC address space.

Thus, patch resolves the FSP-S hang problem on Skylake/ Kaby
Lake processors when the IGD device is disabled. This should
provide to run FSP 2.0-based coreboot on these CPUs families
without integrated graphics card.

The following boards were used for testing:

- Asrock H110M-DVS board (desktop i5-6600) & NVIDIA GTX 1060
  as external GPU.

Virtualization and GFX 3D acceleration with nouveau driver
  still works well  (tested on VirtualBox 5.1.38 with Ubuntu
  18.04.1 as guest and host OS)

- Intel KBL-R U RVP board (mobile i5-8350u) without GFX.

Payload: tianocore edk2-stable201811-216-g51be9d0.

Change-Id: Id7a0cba582d83e3fe7e8d20342ee219cdd369a53
Signed-off-by: Maxim Polyakov 
---
M src/soc/intel/skylake/include/soc/systemagent.h
M src/soc/intel/skylake/romstage/romstage_fsp20.c
M src/soc/intel/skylake/romstage/systemagent.c
M src/soc/intel/skylake/systemagent.c
4 files changed, 38 insertions(+), 18 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/67/32467/3