Attention is currently required from: Nico Huber, Ravishankar Sarawadi, Tim Wawrzynczak, Paul Menzel, Raj Astekar, Patrick Rudolph.
Ethan Tsao has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61389 )
Change subject: soc/intel/graphics: Create Kconfig for mapping graphic memory base
......................................................................
Patch Set 19:
(2 comments)
File src/soc/intel/common/block/graphics/Kconfig:
https://review.coreboot.org/c/coreboot/+/61389/comment/5fc37921_fcb3a3f1
PS19, Line 26: to
: reach at DSM
Unless the hardware changed significantly, it's up to the graphics driver […]
In future platform, GMADR is replaced by LMEMBAR which is fixed map to DSM/GSM.
There is document 643504(FAS) mention it.
GTT size is "fixed" at 8MB(which it is WIP to update in external document).
https://review.coreboot.org/c/coreboot/+/61389/comment/0a0b7f1c_136477f1
PS19, Line 29: GTT_SIZE
DSM used to mean the space of system DRAM that is pre-allocated for graphics, […]
Yes, the hardware process behind BAR 2(0x18) is changed in future platform. It forward to DSM/GSM while access BAR 2.
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