diff --git a/rv1108/BoardConfig-lock-evb-sl-v10.mk b/rv1108/BoardConfig-lock-evb-sl-v10.mk
index a193051..2c6ead9 100644
--- a/rv1108/BoardConfig-lock-evb-sl-v10.mk
+++ b/rv1108/BoardConfig-lock-evb-sl-v10.mk
@@ -38,6 +38,7 @@ export RK_LOADER_POWER_HOLD_GPIO_GROUP=3
 export RK_LOADER_POWER_HOLD_GPIO_INDEX=12
 export RK_LOADER_EMMC_TURNING_DEGREE=0
 export RK_LOADER_BOOTPART_SELECT=0
+export RK_LOADER_PREISP_EN=1
 
 ########################################
 #            Kernel Config             #
diff --git a/rv1108/BoardConfig-lock-evb-sl-v11.mk b/rv1108/BoardConfig-lock-evb-sl-v11.mk
index 1a35652..3750009 100644
--- a/rv1108/BoardConfig-lock-evb-sl-v11.mk
+++ b/rv1108/BoardConfig-lock-evb-sl-v11.mk
@@ -38,6 +38,7 @@ export RK_LOADER_POWER_HOLD_GPIO_GROUP=3
 export RK_LOADER_POWER_HOLD_GPIO_INDEX=14
 export RK_LOADER_EMMC_TURNING_DEGREE=2
 export RK_LOADER_BOOTPART_SELECT=0
+export RK_LOADER_PREISP_EN=1
 
 ########################################
 #            Kernel Config             #