diff --git a/Inc/board_config.h b/Inc/board_config.h
index 47b3c6e..a341040 100644
--- a/Inc/board_config.h
+++ b/Inc/board_config.h
@@ -36,15 +36,15 @@
 
 /******************************************************************************/
 
-#define RS485_RCU            RCU_USART0
+#define RS485_RCU            RCU_USART1
 #define RS485_GPIO_RCU       RCU_GPIOA
 #define RS485_GPIO_PORT      GPIOA
 #define RS485_TX_PIN         GPIO_PIN_2
 #define RS485_RX_PIN         GPIO_PIN_3
-#define RS485_PHY            USART0
+#define RS485_PHY            USART1
 #define RS485_BAUDRATE       115200U
 #define RS485_EN_PIN         GPIO_PIN_1
-#define RS485_IRQ            USART0_IRQn
+#define RS485_IRQ            USART1_IRQn
 
 /******************************************************************************/
 
diff --git a/LD/gd32e23x_flash.ld b/LD/gd32e23x_flash.ld
index 405de65..f48d452 100644
--- a/LD/gd32e23x_flash.ld
+++ b/LD/gd32e23x_flash.ld
@@ -12,8 +12,8 @@ _Min_Stack_Size = 0x400; /* required amount of stack */
 /* Memories definition */
 MEMORY
 {
-    FLASH (rx)  : ORIGIN = 0x08000000, LENGTH = 16K
-    RAM (xrw)   : ORIGIN = 0x20000000, LENGTH = 4K
+    FLASH (rx)  : ORIGIN = 0x08000000, LENGTH = 64K
+    RAM (xrw)   : ORIGIN = 0x20000000, LENGTH = 8K
 }
 
 /* Sections */