diff --git a/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb b/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
index 00c3e0020e..54d2a69a0f 100644
--- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
+++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_u/devicetree.cb
@@ -9,6 +9,7 @@ chip soc/intel/cannonlake
 	register "FspSkipMpInit" = "1"
 	register "SmbusEnable" = "1"
 	register "ScsEmmcEnabled" = "1"
+	register "ScsEmmcHs400Enabled" = "1"
 
 	register "usb2_ports[0]" = "USB2_PORT_TYPE_C(OC0)"
 	register "usb2_ports[1]" = "USB2_PORT_MID(OC0)"
diff --git a/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb b/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
index 086d650737..bb75605b11 100644
--- a/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
+++ b/src/mainboard/intel/cannonlake_rvp/variants/cnl_y/devicetree.cb
@@ -9,6 +9,7 @@ chip soc/intel/cannonlake
 	register "FspSkipMpInit" = "1"
 	register "SmbusEnable" = "1"
 	register "ScsEmmcEnabled" = "1"
+	register "ScsEmmcHs400Enabled" = "1"
 
 	register "usb2_ports[0]" = "USB2_PORT_TYPE_C(OC0)"
 	register "usb2_ports[1]" = "USB2_PORT_TYPE_C(OC0)"