DP83867IR: MII Loopback in u-boot

Hi Lakshmi,

You can use reg<0x0000> = 0x4140 for enabling MII loopback for 1G. You can refer to the register mapping for reg0x0000 in the datasheet.

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Regards,
Gokul.

Hello Gokul,

I am setting following register values  for MII loopback test

0x0 - 0x4140

0x16 - 0x4

0xFE - 0xE720

1F - 0x4000

set ipaddr - 192.168.1.2

Able to ping to same ip address. Is this test is sufficient to confirm MII loopback is working as expected or Do I need to test in different way?

Thanks in advance,

Lakshmi Shetty

Hi Lakshmi,

MII loopback is loopback where data from the MAC is looped back again to the MAC without any processing.
For the MII loopback, setting 0x0000 is sufficient and 0x0016 is not needed. Having the 0x0016 register write doesn't do any harm.

For testing MII loopback, we enable data transfer from the MAC and check if the same is received back.

The IP address pin happens in the MAC(processor here). Can you please check with the processors team on whether this indicates that the loopback?
From the limited knowledge I have, I think if you are able to ping the same IP, it means the loopback looks okay.

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Regards,
Gokul.