[M] Change in coreboot[master]: drivers/intel/gma: Hook up libgfxinit in romstage

[Subrata Banik (Code Review)]

Attention is currently required from: Bora Guvendik, Zhixing Ma, Anil Kumar K, Hannah Williams, Cliff Huang, Tarun Tuli, Nico Huber, Michał Żygowski, Jérémy Compostella, Paul Menzel, Angel Pons, Arthur Heymans.

Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/70276 )

Change subject: drivers/intel/gma: Hook up libgfxinit in romstage
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Patch Set 23:

(1 comment)

File src/soc/intel/common/block/graphics/graphics.c:

https://review.coreboot.org/c/coreboot/+/70276/comment/98122d87_0a602686 
PS23, Line 181: 	if (CONFIG(HWBASE_STATIC_MMIO)) {
> Not really as the GOP driver uses its own BAR address anyway which is way more into the middle the 2GB memory hole.
> [INFO]:[InitializeGfxMmioBase()]:[GfxMmio Base address: 0xAF000000]

Is this even when we are overriding GtMmAdd UPD with 0xfa00_0000. if yes, then this is wrong. FSP/GFX PEIM should reuse the IGD base and avoid overriding.

0xAF00_0000 is default DSC value for GtMmAdd UPD unless overridden by bootloader.