diff --git a/openpower/configs/hostboot/p9dsu.config b/openpower/configs/hostboot/p9dsu.config
index 52ff4c9..9791f1b 100644
--- a/openpower/configs/hostboot/p9dsu.config
+++ b/openpower/configs/hostboot/p9dsu.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
@@ -15,12 +17,12 @@
 unset DJVPD_WRITE_TO_HW
 set DJVPD_READ_FROM_PNOR
 set DJVPD_WRITE_TO_PNOR
-unset MEMVPD_READ_FROM_HW
-unset MEMVPD_WRITE_TO_HW
+set MEMVPD_READ_FROM_HW
+set MEMVPD_WRITE_TO_HW
 set MEMVPD_READ_FROM_PNOR
 set MEMVPD_WRITE_TO_PNOR
-unset PVPD_READ_FROM_HW
-unset PVPD_WRITE_TO_HW
+set PVPD_READ_FROM_HW
+set PVPD_WRITE_TO_HW
 set PVPD_READ_FROM_PNOR
 set PVPD_WRITE_TO_PNOR
 unset CDIMM_FORMAT_FOR_CVPD
@@ -63,6 +65,6 @@
 # set for trace debug to console
 set CONSOLE_OUTPUT_TRACE
 
-unset CONFIG_SECUREBOOT
-unset CONFIG_TPMDD
-unset CONFIG_TPM_NUVOTON
+unset SECUREBOOT
+unset TPMDD
+unset TPM_NUVOTON