remove useless code

bsp/wch/risc-v/Libraries/ch32_drivers/drv_eth.c

@@ -1,15 +1,11 @@
 /*
- * File      : drv_usart.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006-2024, RT-Thread Development Team
+ * Copyright (c) 2006-2024, RT-Thread Development Team
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2021-09-09     WCH        the first version
+ * 2021-09-09     WCH          the first version
  */
 
 #include "board.h"
@@ -21,7 +17,6 @@
 #include "lwipopts.h"
 #include <drv_eth.h>
 
-//#define DRV_DEBUG
 #define LOG_TAG              "drv.eth"
 #include <drv_log.h>
 

bsp/wch/risc-v/Libraries/ch32_drivers/drv_eth.h

@@ -1,16 +1,13 @@
 /*
- * File      : usart.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2009, RT-Thread Development Team
+ * Copyright (c) 2006-2024, RT-Thread Development Team
  *
- * The license and distribution terms for this file may be
- * found in the file LICENSE in this distribution or at
- * http://www.rt-thread.org/license/LICENSE
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2021-09-09     WCH        the first version
+ * 2021-09-09     WCH          the first version
  */
+
 #ifndef __DRV_ETH_H__
 #define __DRV_ETH_H__
 #include "rthw.h"
@@ -26,20 +23,12 @@
     #define USE_GIGA_MAC
     #ifndef USE_GIGA_MAC
         #define USE_FAST_MAC
-        //#define USE_RMII
     #endif
 #endif
 
 #define ETH_RXBUFNB        6
 #define ETH_TXBUFNB        6
 
-#if 0
-#define USE_LOOP_STRUCT  1
-#else
-#define USE_CHAIN_STRUCT  1
-#endif
-
-
 typedef struct
 {
     u32 length;