diff --git a/CMakeLists.txt b/CMakeLists.txt
index 893f6d1..a09b683 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,6 +45,7 @@ set(TARGET_C_SOURCES
     "BSP/Peripheral/src/ch32v30x_tim.c"
     "BSP/Peripheral/src/ch32v30x_usart.c"
     "BSP/Peripheral/src/ch32v30x_wwdg.c"
+    "src/board.c"
     "src/ch32v30x_it.c"
     "src/main.c"
     "src/syscalls.c"
diff --git a/README.md b/README.md
index 0956394..f7be033 100644
--- a/README.md
+++ b/README.md
@@ -26,10 +26,11 @@ The first file is used for CH32V303 devices, which lacks of the following periph
 * USBHS
 * DVP
 
-** Change the startup file to the correct version for the hardware in use. **
+*** Change the startup file to the correct version for the hardware in use. ***
 
 ### Compilers
-These MCUs uses something called "RISC-V4A" core with Chinese documentation provided.
+These MCUs uses something called "RISC-V4F" core with Chinese documentation provided:
+* Implemented RV32IMAFC ABI
 
 Here is the list of features proprietary or incompatible with upstream toolchain:
 * Fast IRQ handlers: uses a special attribute of `interrupt`, which value is `WCH-Interrupt-fast`
\ No newline at end of file
diff --git a/include/board.h b/include/board.h
new file mode 100644
index 0000000..1f7acd4
--- /dev/null
+++ b/include/board.h
@@ -0,0 +1,4 @@
+#ifndef BOARD_H
+#define BOARD_H
+
+#endif
\ No newline at end of file
diff --git a/src/board.c b/src/board.c
new file mode 100644
index 0000000..518671d
--- /dev/null
+++ b/src/board.c
@@ -0,0 +1,5 @@
+#include "ch32v30x_conf.h"
+
+void BOARD_LED_Init(void) {
+    
+}
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 65f80a5..5e6a0da 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,7 +2,7 @@
 
 #include <stdio.h>
 
-#include <debug.h>
+#include "debug.h"
 
 int main(void) {