DP83822I: Linux/DP83822: Can' t ping using zynq to transplant Linux

Hello Kailyn,

Here are a few comments on the schematic and attached screenshots:

1. Please confirm that the power supply filtering caps are present in the schematic as shown in "Figure 36. Power Connections". Also although it looks like you are able to access registers with no problem because 0x0002 and 0x0003 reads are correct, the MDC pin does not require a pullup resistor, only MDIO does.
2. Based on your screenshot of register 0x0001 contents it looks like the auto-negotiation process was not completed, can you confirm the link partner is also capable of auto-negotiation and is set for this? Also please send me the read back value of register 0x0004, 0x0005 and 0x0010.

Thanks,

Vibhu

Hi Vibhu，

Thank you very much for your reply.

The readback value of related register is as following:

register 0x00 is 0x3100
register 0x01 is 0x7849
register 0x02 is 0x2000
register 0x03 is 0xa240
register 0x04 is 0x1e1
register 0x05 is 0x0
register 0x06 is 0x4
register 0x09 is 0x0
register 0x0a is 0x100
register 0x0d is 0x0
register 0x0e is 0x0
register 0x0f is 0x0
register 0x12 is 0x0
register 0x13 is 0x800
register 0x14 is 0x0
register 0x15 is 0x0
register 0x16 is 0x100
register 0x17 is 0x2c1
register 0x18 is 0x400
register 0x19 is 0x801f
register 0x1a is 0x0
register 0x1b is 0x7d
register 0x1c is 0x5ee

Best regards

Kailyn

Hello Kailyn,

Based on your screenshot of register 0x0001 contents it looks like the auto-negotiation process was not completed, can you confirm the link partner is also capable of auto-negotiation and is set for this? Also please send me the read back value of register 0x0004, 0x0005 and 0x0010.

PHYSTS register 0x0010 will tell you whether the auto-negotiation process is complete or not, currently 0x0005 does not show any link capability from the link partner, it may not be set to auto-negotiation, please check.

Thanks,

Vibhu

Hello Vibu,

Thank you very much. According to the customer feedback, the auto-negotiation has no problem and  the link speed is 100M, but couldn't Ping.

The value of register 0x0004, 0x0005 and 0x0010 is listed as above.

0x04 is 0x1e1

0x05 is 0x0

0x0a is 0x100

Best regards

kailyn

Hello Kailyn,

Do you have an update on the above?

Thanks,

Vibhu

Hello Kailyn,

I am closing this thread, please re-open a new thread if further support is needed.

Thanks,

Vibhu