diff --git a/rv1126_rv1109/BoardConfig-38x38-spi-nand-ab.mk b/rv1126_rv1109/BoardConfig-38x38-spi-nand-ab.mk
index 43f2c72..f1cdeb9 100644
--- a/rv1126_rv1109/BoardConfig-38x38-spi-nand-ab.mk
+++ b/rv1126_rv1109/BoardConfig-38x38-spi-nand-ab.mk
@@ -5,9 +5,9 @@ export RK_CHIP=RV1126
 # Target arch
 export RK_ARCH=arm
 # Uboot defconfig
-export RK_UBOOT_DEFCONFIG=rv1126-ab
-# Uboot defconfig fragment, config rk-sfc.config if sdcard upgrade
-export RK_UBOOT_DEFCONFIG_FRAGMENT=rk-sfc.config
+export RK_UBOOT_DEFCONFIG=rv1126
+# Uboot defconfig fragment, config rk-sfc.config if sdcard upgrade, rv1126-ab.config for AB system bootup
+export RK_UBOOT_DEFCONFIG_FRAGMENT="rv1126-ab.config rk-sfc.config"
 # Uboot update loader (spl)
 export RK_LOADER_UPDATE_SPL=true
 # Uboot image format type: fit(flattened image tree)
diff --git a/rv1126_rv1109/BoardConfig-uvcc-spi-nand.mk b/rv1126_rv1109/BoardConfig-uvcc-spi-nand.mk
index ce1d6d9..5e5773c 100644
--- a/rv1126_rv1109/BoardConfig-uvcc-spi-nand.mk
+++ b/rv1126_rv1109/BoardConfig-uvcc-spi-nand.mk
@@ -5,10 +5,9 @@ export RK_CHIP=RV1126
 # Target arch
 export RK_ARCH=arm
 # Uboot defconfig
-#export RK_UBOOT_DEFCONFIG=rv1126
-export RK_UBOOT_DEFCONFIG=rv1126-ab
-# Uboot defconfig fragment, config rk-sfc.config if sdcard upgrade
-export RK_UBOOT_DEFCONFIG_FRAGMENT=rk-sfc.config
+export RK_UBOOT_DEFCONFIG=rv1126
+# Uboot defconfig fragment, config rk-sfc.config if sdcard upgrade, rv1126-ab.config for AB system bootup
+export RK_UBOOT_DEFCONFIG_FRAGMENT="rv1126-ab.config rk-sfc.config"
 # Uboot image format type: fit(flattened image tree)
 export RK_UBOOT_FORMAT_TYPE=fit
 #export RK_SPL_DEFCONFIG=rv1126