--- uboot_old/arch/arm/cpu/astcommon/ast_eth.c	2017-06-07 17:50:47.399409700 +0800
+++ uboot/arch/arm/cpu/astcommon/ast_eth.c	2017-06-07 18:54:49.387532644 +0800
@@ -774,6 +774,44 @@
 	return 0;
 }
 
+int ast_eth_reset(void) 
+{ 
+       int use_num; 
+       int i; 
+       u32 reg; 
+       struct eth_device *dev; 
+ 
+#ifdef CONFIG_NET_MULTI 
+       if(CONFIG_SPX_FEATURE_GLOBAL_NIC_COUNT > 0) 
+               use_num = CONFIG_SPX_FEATURE_GLOBAL_NIC_COUNT; 
+       else 
+               use_num = 1; 
+#else 
+       use_num = 1; 
+#endif 
+    for (i = 0; i < use_num; i ++) { 
+               dev = (struct eth_device *) malloc(sizeof(struct eth_device)); 
+               dev->iobase = ast_eth_reg_addr_base[i]; 
+ 
+               reg = ast_eth_read_reg(dev, MACCR_REG); 
+               reg |= MACCR_SW_RST; 
+               ast_eth_write_reg(dev, reg, MACCR_REG); 
+               udelay(1000); 
+ 
+               reg = ast_eth_read_reg(dev, MACCR_REG); 
+               reg |= MACCR_SW_RST; 
+               ast_eth_write_reg(dev, reg, MACCR_REG); 
+               udelay(1000); 
+ 
+               do { 
+                       reg = ast_eth_read_reg(dev, MACCR_REG); 
+                       udelay(1000); 
+               } while (reg & MACCR_SW_RST); 
+       } 
+       free(dev); 
+       return 1; 
+}  
+
 int ast_eth_initialize(bd_t *bis)
 {
 	unsigned int scu_reg;