TDA4VM: SOC_I2C2 devices and automation header

Hi David,

Which SDK are you using or planning to use?

David Dominguez Moises said:

1. Can I remove the ina226 current monitors without FW impact?

Yes this could be removed but you might see error prints from ina22x drivers during Linux boot.

David Dominguez Moises said:

3. Also, will never boot from EEPROM. Can I remove the EEPROM without FW impact?

Should be okay as well.

David Dominguez Moises said:

EVM has a board ID EEPROM. Is there any dependency to it? Can I remove it without FW impact? 

It can boot without that. There might be some messages on the u-boot logs.

David Dominguez Moises said:

Is the io expander for bootmode pins used by SoC or only automation header? Can this io expander be removed without FW impact?

I will let my colleague Robert answer that.

Best Regards,
Keerthy

The IO expander for BOOTMODE is used by the automation header.  Yes - can be removed without impact to FW/SW.

Hi Keerthy, Robert,

Thanks for the information. The SDK we are planning to use is PROCESSOR-SDK-RTOS-J721E_07.03.00.07 which seems to be the latest RTOS release for TDA4VM. We want to use the vision apps so it seems the RTOS SDK is what we need.

• Please confirm if your previous comments apply to this SDK too.
• Also, per the previous response the board should boot without board ID EEPROM , but would there be any misconfiguration on the system because of its absence?

Thanks,

David

David,

Keerthy will need to help answer this.  I know SW reads the Board ID EEPROM and gets board name, revision, etc information and makes decisions based on that information.

Keerthy J could you confirm on the last 2 questions please +  a new one:

David Dominguez Moises said:

• Please confirm if your previous comments apply to this SDK too.
• Also, per the previous response the board should boot without board ID EEPROM , but would there be any misconfiguration on the system because of its absence?

To avoid impact or misconfiguration. Can I just put the same eeprom and put the contents that the SoC expects on an EVM? Where could I get these contents from, If I were going to do this.

Hi David,

U-boot directory: board/ti/j721e/evm.c

int checkboard(void)
{
        struct ti_am6_eeprom *ep = TI_AM6_EEPROM_DATA;

        if (do_board_detect())
                /* EEPROM not populated */
                printf("Board: %s rev %s\n", "J721EX-PM1-SOM", "E2");
        else
                printf("Board: %s rev %s\n", ep->name, ep->version);

        return 0;
}

So it is taking some default string if eeprom not populated. So that is why i mentioned it would boot.

There could be mis-configuration due to that.

David Dominguez Moises said:

Please confirm if your previous comments apply to this SDK too.

Yes Robert's comments apply to this SDK too.

My board EEPROM Contents read: J721EX-PM2-SOM  E6

That is where u-boot picks it from.

Robert Eschler: Can you help David with contents of EEPROM?

Best Regards,
Keerthy

Below are EEPROM contents for J721EX SOM.  Version numbers might be different.