Downclock Ethernet Phy

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

Hello,

i am trying to downclock Ethernet Phy of Xavier NX to 60% to get extended Cable reach with a Broadrreach BCM548811 in Reverse MII Mode.

So, i removed the 25Mhz oscillator on Xavier NX and replaced it with 15Mhz oscillator.
In “tegra194-a02-bpmp-p3668-a00.dtb” i modified clocks for eqos_axi, eqos_rx and eqos_tx.
At boot time i got Message: “eqos 2450000.ether_qos: eqos_clock_enable failed”.
What is wrong? Or is it possible at all?

Thanks in advance.

4

We don’t quite understand what you are trying and the real use case, but to change the parts on the board is not able to support.