报错背景
原本配置好的uboot，具体启动开发板突然报错超时
开发板启动时报错
Hit any key to stop autoboot: 0 FEC1 Waiting for PHY auto negotiation to complete......... TIMEOUT ！ Using FEC1 device TFTP from server 192.168.19.100; our IP address is 192.168.19.101 Filename 'zImage'. Load address: 0x80800000 Loading: * ARP Retry count exceeded; starting again FEC1 Waiting for PHY auto negotiation to complete......... TIMEOUT ！
原因分析：
网线松动了
解决办法
接好网线，重新启动即可。
![解决Dev-C++ [Error] ‘for‘ loop initial declarations are only allowed in C99 or C11 mode](https://ucc.alicdn.com/images/user-upload-01/30b967cf81fc43129a6f63726ee16432.png?,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Z5ZnVnb3lmYQ==,size_16,color_FFFFFF,t_70?x-oss-process=image/resize,h_160,m_lfit)
![[Error] ‘for‘ loop initial declarations are only allowed in C99 mode](https://ucc.alicdn.com/images/user-upload-01/img_convert/45e886c36126f909b65535693c185792.png?x-oss-process=image/resize,h_160,m_lfit)