mb/google/zork: Add Kconfig to set IGD UMA allocation via APCB

Add a Kconfig choice to select the IGD UMA allocation, which selects a
precompiled ACPB binary with the corresponding UMA value set. Default
to the previous value (128MB) for non-ChromeOS builds, and 64MB for
ChromeOS as that is the value used there.

TEST=build/boot google/morphius, verify UMA size changes with selection
via dxdiag tool under Windows.

Change-Id: I6debd10527c33ce37ef3ada20955c8f7b7500039
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84237
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/zork/Kconfig

@@ -301,4 +301,25 @@ config CHROMEOS_WIFI_SAR
 	select SAR_ENABLE
 	select USE_SAR
 
+choice
+	prompt "UMA Memory Allocation"
+	default ZORK_UMA_SIZE_64MB if CHROMEOS
+	default ZORK_UMA_SIZE_128MB
+	help
+	  The amount of system memory allocated for the integrated GPU.
+
+config ZORK_UMA_SIZE_64MB
+	bool "64MB"
+
+config ZORK_UMA_SIZE_128MB
+	bool "128MB"
+
+config ZORK_UMA_SIZE_256MB
+	bool "256MB"
+
+config ZORK_UMA_SIZE_512MB
+	bool "512MB"
+
+endchoice
+
 endif # BOARD_GOOGLE_BASEBOARD_TREMBYLE || BOARD_GOOGLE_BASEBOARD_DALBOZ

src/mainboard/google/zork/spd/Makefile.mk

@@ -5,7 +5,16 @@ SPD_SOURCES_DIR=$(dir $(word 1, $(SPD_SOURCES)))
 APCB_SOURCES=$(foreach f, $(basename $(notdir $(SPD_SOURCES))), $(obj)/APCB_$(f).gen)
 
 # APCB binary with magic numbers to be replaced by apcb_edit tool
-APCB_NAME=data.apcb
+ifeq ($(CONFIG_ZORK_UMA_SIZE_64MB),y)
+APCB_NAME=uma_64.apcb
+else ifeq ($(CONFIG_ZORK_UMA_SIZE_128MB),y)
+APCB_NAME=uma_128.apcb
+else ifeq ($(CONFIG_ZORK_UMA_SIZE_256MB),y)
+APCB_NAME=uma_256.apcb
+else ifeq ($(CONFIG_ZORK_UMA_SIZE_512MB),y)
+APCB_NAME=uma_512.apcb
+endif
+
 APCB_PATH=$(src)/mainboard/$(MAINBOARDDIR)
 
 $(obj)/APCB_%.gen:	$(SPD_SOURCES_DIR)%.hex \