diff --git a/plat/intel/soc/stratix10/include/s10_system_manager.h b/plat/intel/soc/stratix10/include/s10_system_manager.h
index 802386c..4500c6f 100644
--- a/plat/intel/soc/stratix10/include/s10_system_manager.h
+++ b/plat/intel/soc/stratix10/include/s10_system_manager.h
@@ -59,6 +59,11 @@
 #define S10_CCU_NOC_CPU0_RAMSPACE0_0		0xf7004688
 #define S10_CCU_NOC_IOM_RAMSPACE0_0		0xf7018628
 
+#define S10_SYSMGR_CORE(x)			(0xffd12000 + (x))
+#define SYSMGR_MMC				0x28
+#define SYSMGR_MMC_DRVSEL(x)			(((x) & 0x7) << 0)
+
+
 #define DISABLE_L4_FIREWALL	(BIT(0) | BIT(16) | BIT(24))
 
 void enable_nonsecure_access(void);
diff --git a/plat/intel/soc/stratix10/soc/s10_system_manager.c b/plat/intel/soc/stratix10/soc/s10_system_manager.c
index 48f37d7..a2ed5a3 100644
--- a/plat/intel/soc/stratix10/soc/s10_system_manager.c
+++ b/plat/intel/soc/stratix10/soc/s10_system_manager.c
@@ -86,5 +86,8 @@
 
 	mmio_clrbits_32(S10_CCU_NOC_CPU0_RAMSPACE0_0, 0x03);
 	mmio_clrbits_32(S10_CCU_NOC_IOM_RAMSPACE0_0, 0x03);
+
+	mmio_write_32(S10_SYSMGR_CORE(SYSMGR_MMC), SYSMGR_MMC_DRVSEL(3));
+
 }