I am using the MPC8572E processor.
MPC8572 eTSECs is connected Marvell 88E1111 single PHY.
The mode between MAC and PHY is RGMII.
ethernet link partner support 1Gbps.
at room temperature.... ethernet working fine.
but, at low temperature ... ethernet link is not establishing.
strictly speaking, repeat link up and down infinitely.
In this state, Transmit clock(TSECn_GTX_CLK) is not working, drive low.
What causes the TSECn_GTX_CLK not working ?
What registers are available for debugging?
Thank you for your help.