diff --git a/configs/Merrii_A80_Optimus_defconfig b/configs/Merrii_A80_Optimus_defconfig
index c5d1f40..2b96f6b 100644
--- a/configs/Merrii_A80_Optimus_defconfig
+++ b/configs/Merrii_A80_Optimus_defconfig
@@ -12,5 +12,6 @@
 CONFIG_USB1_VBUS_PIN="PH4"
 CONFIG_USB3_VBUS_PIN="PH5"
 CONFIG_AXP_GPIO=y
+CONFIG_SYS_MONITOR_LEN=786432
 CONFIG_SYS_I2C_SUN8I_RSB=y
 CONFIG_AXP809_POWER=y