LS1021A : net eth0: could not attach to PHY

[sukruthrameshba]

Hi, 

Pavel‌

I am using custom-made eval board in which LS1021A is populated.

We are evaluating gigabit ethernet PHYs using this evaluation boards.

Attached the log file for more information on BSP, U-Boot.

Sometimes, on power-on it doesn't detect the PHY. 

"

starting network interfaces...
[ 5.132126] net eth0: could not attach to PHY "

However, On doing the hard reset It detects the PHY.

Attached log file for both the scenarios.

Can you please help me out in resolving this issue?

Thanks in advance.

Regards,

Sukruth

[yipingwang]

Hello SUKRUTH RAMESH BABU,

According to your description, it sees that this problem is caused by the unstable hardware. Please monitor the MAC/PHY interface activity with a scope and check for HW specification.

Please try to do PHY status detection under u-boot, please modify the following section in the file include/configs/ls1021atwr.h in u-boot source code according to the Ethernet port MDIO PHY addresses on your custom board, then rebuild u-boot and deploy it to your target board.

#define TSEC1_PHY_ADDR                  2
#define TSEC2_PHY_ADDR                  0
#define TSEC3_PHY_ADDR                  1

Please check the mido PHY information

=> mdio list
FSL_MDIO0:
0 - AR8031/AR8033 <--> eTSEC2
1 - AR8031/AR8033 <--> eTSEC3
2 - AR8031/AR8033 <--> eTSEC1

Read PHY related registers with the following commands.

mdio read <PHY address> <REGISTER Address>

Example, The link partner (“copper side”) link status bit is in Register #1 on the PHY.
=> mdio read eTSEC1 1
Reading from bus FSL_MDIO0
PHY at address 2:
1 - 0x796d

Have a great day,
TIC

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