IMX6SX UBOOT PHY

[2548903578]

I am using the IMX6SX chip with 800M frequency and yocto to build the file. The uboot version number is 2020.04-5.4.24-2.1.0. Because we don't need a gigabit network, the AR8031 network chip is replaced with a KSZ8081 chip, using the RMII interface. But no matter how I modify the two files git/board/freescale/mx6sxsabresd/mx6sxsabresd.c and git/include/configs/mx6sxsabresd.h, they have no effect. What should I do to make KSZ8081 work properly? In addition, we use an external crystal oscillator as the clock source.

[2548903578]

I found that the network used the device tree and entered the function fecmxc_probe. I want to ask if this function initializes the RMII/RGMII interface? How can I modify this file and the device tree file to achieve my function?

[joanxie]

this is my porting experience on imx7d, maybe you can refer to it

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/Porting-KSZ9031on-the-imx7DPorting-KSZ90...

you also can refer to the another topic:

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/Using-KSZ9031-PHY-On-i-MX8MM-and-L5-4-24...

[2548903578]

Hi,joanxie 

Thank you very much for your reply. Now my board can communicate with ksz8081, but the network is unavailable. I guess it is related to changing RGMII to RMII and providing clock source through external crystal oscillator, but I am not sure how to modify this.

[joanxie]

could you share your uboot environment with me? by command "printenv"

[2548903578]

スポイラ

Can someone help me? thank you very much.

[2548903578]

Does anyone know, can provide an example