x86: Add Video BIOS Table (VBT) related Kconfig options

This adds Kconfig options for Video BIOS Table which is normally
required if you are using an Intel FSP firmware that is complaint
with spec 1.1 or later to initialize the integrated graphics device.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/Kconfig

@@ -558,6 +558,40 @@ config VGA_BIOS_ADDR
 	  address of 0xfff90000 indicates that the image will be put at offset
 	  0x90000 from the beginning of a 1MB flash device.
 
+config HAVE_VBT
+	bool "Add a Video BIOS Table (VBT) image"
+	depends on HAVE_FSP
+	help
+	  Select this option if you have a Video BIOS Table (VBT) image that
+	  you would like to add to your ROM. This is normally required if you
+	  are using an Intel FSP firmware that is complaint with spec 1.1 or
+	  later to initialize the integrated graphics device (IGD).
+
+	  Video BIOS Table, or VBT, provides platform and board specific
+	  configuration information to the driver that is not discoverable
+	  or available through other means. By other means the most used
+	  method here is to read EDID table from the attached monitor, over
+	  Display Data Channel (DDC) using two pin I2C serial interface. VBT
+	  configuration is related to display hardware and is available via
+	  the ACPI OpRegion or, on older systems, in the PCI ROM (Option ROM).
+
+config VBT_FILE
+	string "Video BIOS Table (VBT) image filename"
+	depends on HAVE_VBT
+	default "vbt.bin"
+	help
+	  The filename of the file to use as Video BIOS Table (VBT) image
+	  in the board directory.
+
+config VBT_ADDR
+	hex "Video BIOS Table (VBT) image location"
+	depends on HAVE_VBT
+	default 0xfff90000
+	help
+	  The location of Video BIOS Table (VBT) image in the SPI flash. For
+	  example, base address of 0xfff90000 indicates that the image will
+	  be put at offset 0x90000 from the beginning of a 1MB flash device.
+
 config ROM_TABLE_ADDR
 	hex
 	default 0xf0000