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Linux: Ethernet not getting up on AM335x

Tool/software: Linux

Hello all,

we are using SOM with AM335x processor .Carrier board is custom.Booting procedure is done.

we are getting g_ether ready in boot sequence.

but when we connect Ethernet cable, we are not seeing anything with dmesg.link is not getting up.

i have made eth0 dhcp in /etc/network/interfaces

starting network interfaces...
RTNETLINK answers: File exists
udhcpc (v1.20.2) started
Sending discover...
Sending discover...
Sending discover...
No lease, failing
[   16.134857] net eth1: CPSW phy found : id is : 0x7c0f1
udhcpc (v1.20.2) started
Sending discover...
Sending discover...
Sending discover...
No lease, failing

these are response line during boot.same response i found when i made eth0 up via  "ifup eth0".

what could be issue??is it problem from driver layer?what else i should do??

same Images for BSP are working with EVM of same SOM series.In EVM ethernet is working.

can anyone explain meaning of line "[   16.134857] net eth1: CPSW phy found : id is : 0x7c0f1"????