Kconfig: Create RAMPAYLOAD kconfig

This patch enables coreboot flow to skip ramstage as
individual stage to load payload. Instead it is expected
to load payload from postcar stage.

Change-Id: I839f2d34a93b69ca6bf3de6594e2ad9f66ee7135
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32618
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: ron minnich <rminnich@gmail.com>

src/Kconfig

@@ -277,6 +277,21 @@ config BOOTSPLASH_FILE
 	  The path and filename of the file to use as graphical bootsplash
 	  screen. The file format has to be jpg.
 
+config RAMPAYLOAD
+	bool "Enable coreboot flow without executing ramstage"
+	default n
+	depends on ARCH_X86
+	help
+	  If this option is enabled, coreboot flow will skip ramstage
+	  loading and execution of ramstage to load payload.
+
+	  Instead it is expected to load payload from postcar stage itself.
+
+	  In this flow coreboot will perform basic x86 initialization
+	  (DRAM resource allocation), MTRR programming,
+	  Skip PCI enumeration logic and only allocate BAR for fixed devices
+	  (bootable devices, TPM over GSPI).
+
 endmenu
 
 menu "Mainboard"