imx6 ar8031 chip

dngnstjd — Mon, 21 Dec 2020 03:26:28 GMT

Hi, I am using ar8031 ethernet chip on imx6q board.

Link up message is displayed on terminal.

but, does not ping.

I used an oscilloscope to measure the signal levels of RGMII_CLK (ENET_REF_CLK) and RGMII_TXC.

RGMII_CLK (ENET_REF_CLK) : 1.4V

RGMII_TXC : 1.2V

I think, The signal level seems too low.

Can I solve this problem by adjusting the impedance on the device tree?

I have already changed the value a few times, but there is no change.

Thank you!!!

Re: imx6 ar8031 chip

igorpadykov — Mon, 21 Dec 2020 04:44:21 GMT

Hi dngnstjd

one can check enet voltage levels using Table 2-9. Gigabit Ethernet Recommendations

Best regards
igor