diff --git a/openpower/configs/hostboot/romulus.config b/openpower/configs/hostboot/romulus.config
index 3d8aaad..af8a85e 100755
--- a/openpower/configs/hostboot/romulus.config
+++ b/openpower/configs/hostboot/romulus.config
@@ -1,6 +1,8 @@
-# The Serial Flash Controller is the AST2400 BMC.
-set   SFC_IS_AST2500
+# The BMC MBOX Protocol is used to access PNOR
+unset SFC_IS_AST2500
 unset SFC_IS_AST2400
+set   PNORDD_IS_BMCMBOX
+unset PNORDD_IS_SFC
 unset BMC_DOES_SFC_INIT
 unset SFC_IS_IBM_DPSS
 set   ALLOW_MICRON_PNOR
@@ -45,8 +47,8 @@
 
 # Compile in hostboot runtime PRD
 set HBRT_PRD
-unset HTMGT
-unset START_OCC_DURING_BOOT
+set HTMGT
+set START_OCC_DURING_BOOT
 
 #PNOR flags
 unset PNOR_TWO_SIDE_SUPPORT
diff --git a/openpower/configs/romulus_defconfig b/openpower/configs/romulus_defconfig
index 6f1540a..9d83f85 100644
--- a/openpower/configs/romulus_defconfig
+++ b/openpower/configs/romulus_defconfig
@@ -42,7 +42,7 @@
 BR2_OPENPOWER_POWER9=y
 BR2_HOSTBOOT_CONFIG_FILE="romulus.config"
 BR2_OPENPOWER_MACHINE_XML_GITHUB_PROJECT_VALUE="romulus-xml"
-BR2_OPENPOWER_MACHINE_XML_VERSION="301279cbdb3595ad1bbdce4d9d2189db0470a62a"
+BR2_OPENPOWER_MACHINE_XML_VERSION="4a9a504238c6cb965c1288ace63b938fa23fe6ba"
 BR2_OPENPOWER_MACHINE_XML_FILENAME="romulus.xml"
 BR2_OPENPOWER_SYSTEM_XML_FILENAME="ROMULUS_hb.system.xml"
 BR2_OPENPOWER_MRW_XML_FILENAME="ROMULUS_hb.mrw.xml"