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PROCESSOR-SDK-AM64X: Bypassing EEPROM for custom board

Abin Raj
Prodigy 160 points
Part Number: PROCESSOR-SDK-AM64X


Hi, I am trying to bring up processor SDK 8.0 Linux on my custom board based on AM64 GPEVM.

Based on my logs, I think that the U-boot fails to load due to EEPROM not having the required data. I have an EEPROM at a different address than the EVM. I would like to know how we can achieve the following:

1. How can we bypass or hardcode values for AM64 GPEVM ? Since board is based on GPEVM, I would like to boot with settings for GPEVM. I tried to set the board name to "AM64-GPEVM" in the u-boot/board/ti/common/board_detect.c, but it seems like we need more than just the board name for this to take place.

    //strlcpy(ep->name, am_ep.name, TI_EEPROM_HDR_NAME_LEN + 1);
     strlcpy(ep->name, "AM64-GPEVM", TI_EEPROM_HDR_NAME_LEN + 1);

2. Could you share the data and storage address so that I can try programming the EEPROM with this data.

First option is preferred as it would free my EEPROM for other data storage. Any help is appreciated Slight smile

  • 0
    Prodigy 160 points

    Also tried to remove "TI_I2C_BOARD_DETECT" from the Kconfig file. The EEPROM error goes away, but remaining boot logs is the same

  • 0 in reply to Abin Raj
    TI__Guru 72070 points

    Hi Abin,
    The EEPROM board_ID info can be referenced in "u-boot/board/ti/common/board_detect.h" file.
    I'm attaching a log file I captured on AM64x GP EVM for reading EEPROM board_ID via I2C cmds @u-boot prompt for your reference.
    Best,
    -Hong

    Fullscreen am64x_gp_evm_eeprom_read.txt Download 
    => i2c dev 0
Setting bus to 0
=> i2c md 0x50 0x0.2 0x100
0000: aa 55 33 ee 01 fc 00 10 2e 00 41 4d 36 34 2d 47    .U3.......AM64-G
0010: 50 45 56 4d 00 00 00 00 00 00 45 32 30 31 30 31    PEVM......E20101
0020: 30 31 45 32 00 00 30 31 30 31 30 38 32 31 00 00    01E2..01010821..
0030: 00 00 00 00 30 31 33 36 11 02 00 10 29 13 c2 00    ....0136....)...
0040: 08 00 70 f1 0f 76 ff 0d 70 f1 0f 76 ff 0e 70 f1    ..p..v..p..v..p.
0050: 0f 76 ff 0d 70 f1 0f 76 ff 0d 00 00 00 00 00 00    .v..p..v........
0060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
0070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
0090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
00a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
00b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
00c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
00d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
00e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
00f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
=>

  • 0 in reply to Hong Guan64
    Prodigy 160 points

    Is there a way that I can bypass eeprom check by hardcoding these values ?

  • 0 in reply to Abin Raj
    TI__Guru 72070 points

    Hi Abin,
    Have you tried something like below? I didn't try it myself since EEPROM was pre-programmed with the board info on AM64x GP EVM.
    In "u-boot/board/ti/common/board_detect.c", add "return 1;" at the start of the function board_ti_k3_is().

    The other option is populating SRAM @TI_AM6_EEPROM_DATA with the AM64x GP EVM board info in your code instead of filling it via reading EEPROM.

    #define TI_AM6_EEPROM_DATA ((struct ti_am6_eeprom *) \
				TI_SRAM_SCRATCH_BOARD_EEPROM_START)

    Best,
    -Hong

  • 0 in reply to Hong Guan64
    Prodigy 160 points

    Will it affect any functionalities of the board as I see some MAC values being used from the EEPROM ?

    Could you maybe try it out and share the results from your end?

  • 0 in reply to Abin Raj
    TI__Guru 72070 points

    Hi Abin,
    I'll check on MAC dependency, and get back to you earlier next week.
    There's no easy way to run it on AM64x GP EVM since EEPROM was pre-programmed with the board info.
    Best,
    -Hong

  • 0 in reply to Hong Guan64
    Prodigy 160 points

    Hi , any updates on all open questions ?