Downclock Ethernet Phy


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.

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.