Kconfig: Allow native vga init to be selectable for SeaBIOS payload

Change-Id: I1508f3d3c56cb9afbf4a23355831549552a62866
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/6891
Tested-by: build bot (Jenkins)
Reviewed-by: Kevin O'Connor <kevin@koconnor.net>
Reviewed-by: Martin Roth <gaumless@gmail.com>

src/Kconfig

@@ -642,6 +642,17 @@ config SEABIOS_MALLOC_UPPERMEMORY
 	  hardware.  In general, if this is desired, the option will be
 	  set to 'N' by the chipset Kconfig.
 
+config SEABIOS_VGA_COREBOOT
+	prompt "Include generated option rom that implements legacy VGA BIOS compatibility" if PAYLOAD_SEABIOS
+	default n
+	depends on !VGA_BIOS && MAINBOARD_DO_NATIVE_VGA_INIT
+	bool
+	help
+	  Coreboot can initialize the GPU of some mainboards.
+
+	  After initializing the GPU, the information about it can be passed to the payload.
+	  Provide an option rom that implements this legacy VGA BIOS compatibility requirement.
+
 choice
 	prompt "GRUB2 version"
 	default GRUB2_MASTER
@@ -689,6 +700,11 @@ config PAYLOAD_FILE
 	depends on PAYLOAD_SEABIOS
 	default "payloads/external/SeaBIOS/seabios/out/bios.bin.elf"
 
+config PAYLOAD_VGABIOS_FILE
+	string
+	depends on PAYLOAD_SEABIOS && SEABIOS_VGA_COREBOOT
+	default "payloads/external/SeaBIOS/seabios/out/vgabios.bin"
+
 config PAYLOAD_FILE
 	depends on PAYLOAD_FILO
 	default "payloads/external/FILO/filo/build/filo.elf"

src/arch/x86/Makefile.inc

@@ -349,6 +349,7 @@ seabios:
 			CONFIG_SEABIOS_MASTER=$(CONFIG_SEABIOS_MASTER) \
 			CONFIG_SEABIOS_STABLE=$(CONFIG_SEABIOS_STABLE) \
 			CONFIG_SEABIOS_THREAD_OPTIONROMS=$(CONFIG_SEABIOS_THREAD_OPTIONROMS) \
+			CONFIG_SEABIOS_VGA_COREBOOT=$(CONFIG_SEABIOS_VGA_COREBOOT) \
 			CONFIG_CONSOLE_SERIAL=$(CONFIG_CONSOLE_SERIAL) \
 			CONFIG_TTYS0_BASE=$(CONFIG_TTYS0_BASE) \
 			CONFIG_SEABIOS_MALLOC_UPPERMEMORY=$(CONFIG_SEABIOS_MALLOC_UPPERMEMORY) \