diff --git a/src/mainboard/amd/onyx/Kconfig b/src/mainboard/amd/onyx/Kconfig
index ce1b980359..260a498c65 100644
--- a/src/mainboard/amd/onyx/Kconfig
+++ b/src/mainboard/amd/onyx/Kconfig
@@ -4,6 +4,11 @@ config BOARD_SPECIFIC_OPTIONS
 	def_bool y
 	select SOC_AMD_GENOA
 	select MISSING_BOARD_RESET
+	select BOARD_ROMSIZE_KB_32768
+
+config FMDFILE
+	default "src/mainboard/amd/onyx/board.fmd"
+
 
 config MAINBOARD_DIR
 	default "amd/onyx"
diff --git a/src/mainboard/amd/onyx/board.fmd b/src/mainboard/amd/onyx/board.fmd
new file mode 100644
index 0000000000..a5118c3ef5
--- /dev/null
+++ b/src/mainboard/amd/onyx/board.fmd
@@ -0,0 +1,8 @@
+FLASH 32M {
+	BIOS 16M {
+		COREBOOT(CBFS)
+		FMAP 4K
+		RW_VPD 8K
+		RO_VPD 8K
+	}
+}