[coreboot-gerrit] Change in coreboot[master]: soc/{apl,glk}: Allow to select the primary graphics device

[Maxim Polyakov (Code Review)]

Attention is currently required from: Nico Huber, Mario Scheithauer, Angel Pons, Werner Zeh.
Maxim Polyakov has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/39374 )

Change subject: soc/{apl,glk}: Allow to select the primary graphics device
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Patch Set 32:

(1 comment)

File src/soc/intel/apollolake/chip.h:

https://review.coreboot.org/c/coreboot/+/39374/comment/9e41e918_74f4bfd2 
PS17, Line 45: PRIMARY_AUTO = 0,
             : 	PRIMARY_IGD  = 2,
             : 	PRIMARY_PCI  = 3,
> I don't have an external adapter at the moment, but I will try to contact the company's engineers so […]

If ONBOARD_VGA_IS_PRIMARY is set, coreboot/tianocore shows the splashscreen/setup menu only on the display connected to IGD and there is nothing on the display with an external GPU.