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说明： 开发板：硬石YS-H7Pro, 芯片stm32h743iit6
开发工具：win10系统，ip固定为192.168.2.201; IDE为rt-thread studio 2.0
项目配置：按芯片型号添加RT-Thread v4.02项目；board.h取消eth部分相应注释，启动lan8720驱动；stm32h7xx_hal_conf中取消HAL_ETH_MODULE_ENABLED注释；board.c中添加eth_msp初始化及phy_reset函数；rt-thread设置添加LWIP，取消DHCP，固定ip为192.168.2.100
其他：默认drvers下面的drv_eth驱动报错，从art-pi的sdk中拷贝drv_eth.c及drv_eth.h，并修改phy_reset部分；
问题：
编译下载后，网络连接状态正常，不过报DMA发送失败，双向ping不通。 \ | / RT - Thread Operating System
/ | \ 4.0.2 build Feb 2 2021
2006 - 2019 Copyright by rt-thread team
lwIP-2.0.2 initialized!
[I/sal.skt] Socket Abstraction Layer initialize success.
[W/drv.emac] eth transmit frame faild: 8
msh >
RT-Thread shell commands:
ifconfig - list the information of all network interfaces
ping - ping network host
dns - list and set the information of dns
netstat - list the information of TCP / IP
version - show RT-Thread version information
list_thread - list thread
list_sem - list semaphore in system
list_event - list event in system
list_mutex - list mutex in system
list_mailbox - list mail box in system
list_msgqueue - list message queue in system
list_mempool - list memory pool in system
list_timer - list timer in system
list_device - list device in system
exit - return to RT-Thread shell mode.
help - RT-Thread shell help.
ps - List threads in the system.
free - Show the memory usage in the system.
reboot - Reboot System
msh >ifconfig
network interface device: e0 (Default)
MTU: 1500
MAC: 00 80 e1 17 3d 22
FLAGS: UP LINK_UP INTERNET_DOWN DHCP_DISABLE ETHARP BROADCAST IGMP
ip address: 192.168.2.100
gw address: 0.0.0.0
net mask : 255.255.255.0
dns server #0: 0.0.0.0
dns server #1: 0.0.0.0
msh >ping 192.168.2.201
[W/drv.emac] eth transmit frame faild: 24
[W/drv.emac] eth transmit frame faild: 24
[W/drv.emac] eth transmit frame faild: 24
ping: from 192.168.2.201 icmp_seq=0 timeout
[W/drv.emac] eth transmit frame faild: 18
[W/drv.emac] eth transmit frame faild: 18
ping: from 192.168.2.201 icmp_seq=1 timeout
ping: from 192.168.2.201 icmp_seq=2 timeout
[W/drv.emac] eth transmit frame faild: 18
[W/drv.emac] eth transmit frame faild: 18
[W/drv.emac] eth transmit frame faild: 18
ping: from 192.168.2.201 icmp_seq=3 timeout
msh >[W/drv.emac] eth transmit frame faild: 18
[W/drv.emac] eth transmit frame faild: 18
[W/drv.emac] eth transmit frame faild: 18  
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