PROCESSOR-SDK-AM69A: How to read/write MAC address in EEPROM?

Daniel Cheng1

Mastermind 7615 points

Part Number: PROCESSOR-SDK-AM69A

Tool/software:

Hi Expert,

How to read/write MAC address in EEPROM?

Thanks

Daniel

6 months ago

0 Tanmay Patil 6 months ago

TI__Mastermind 41850 points

Hi Daniel,

You can use generic i2c drivers to do read/write in EEPROM. After youu read the address in u-boot, you can pass them to linux kernel.

See "probe_daughtercards()" function in "board/ti/j721e/evm.c" in u-boot for reference.

Regards,
Tanmay

0 Glendon Chen 5 months ago in reply to Tanmay Patil

Prodigy 80 points

Hi Tanmay,

I have the same problem.
I can read and write EEPROM, but I don't know what the MAC ADDR offset is. 
as shown in the figure below

I found a table that shows MAC_adrs, but I still don't know the correct address. 
As shown in the red box below:

Is there a more specific offset you can provide?

Best Regards,
Glendon.

0 Doredla Sudheer Kumar 4 months ago in reply to Glendon Chen

TI__Guru 73850 points

Hi,

It looks duplicate to below E2E.
PROCESSOR-SDK-AM69A: How to read/write MAC address in EEPROM?

Please refer to the latest post from above E2E, which clarifies the EEPROM Identifications of J784S4.
From your EEPROM Dump, there is no indication of a MAC address present.

Best Regards,
Sudheer

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PROCESSOR-SDK-AM69A: How to read/write MAC address in EEPROM?