Phytool is a Linux command for MDIO register access, this provides an easy way to read and write registers of a PHY. This tool is already integrated into TI SDK’s but can be downloaded by entering the following sudo apt-get install -y net-tools.

Phytool command:

• phytool read ethx/PHYADDRESS/desiredRegister
• phytool write ethx/PHYADDRESS/desiredRegister writeValue

root@j7-evm:~# phytool read eth1/10/0x0    //Read Register 0x0
0x1140                                              //Result  
root@j7-evm:~# phytool write eth1/10/0x0 0x0140     //Write Reg 0x0 = 0x0140
root@j7-evm:~# phytool read eth1/10/0x0             //Read again to confirm write command
0x0140