AM62A7-Q1: Custom Board Boot Up Fails

Jagadeesh Pichandi

Part Number: AM62A7-Q1
Other Parts Discussed in Thread: AM62A7

Tool/software:

Hi Team,

We have made a custom board of AM62A7 with reference EVM board schematic. Below are the steps we have followed for booting.

1) Power up the device and validated the PMIC Voltages

2) Tried connecting with UART SOC/MCU but did not get Console output

3) Since we didn't get UART and we have followed the Debugging Tips from TI

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1358039/faq-board-bring-up-tips-for-sitara-devices-am64x-am243x-am62x-am62ax-am62px

4) Checked MCU_RESETSTAT and RESETSTAT signals both are high as recommended

5) Checked BOOTMODE signals are set correctly for the boot Source

* Tried with SD Card MMC1, not getting Clock Signal

* Tried with eMMC, not getting clock signal

6) We have checked the Voltage levels of Power Sequence Rails and it is proper

Please guide us to solve the above issue.

Also would like to mention that device takes current from 100 to 150mA.

Thanks,

Jagadeesh

8 months ago

0 Kallikuppa Sreenivasa 8 months ago

TI__Guru**** 198979 points

Hello Jagadeesh

Thank you for the query.

Would you be able to share the custom board schematics for a quick review.

Regards,

Sreenivasa

0 Jagadeesh Pichandi 8 months ago in reply to Kallikuppa Sreenivasa

Prodigy 30 points

Hi Sreenivasa,

Thanks for the response. I hope this is public forum and we have restriction to share the Schematics.

Can we start a new thread on private forum or any other way?

Regards,

Jagadeesh

0 Kallikuppa Sreenivasa 8 months ago in reply to Jagadeesh Pichandi

TI__Guru**** 198979 points

Hello Jagadeesh

Thank you.

You should be able to share over private message if that is an option.

Regards,

Sreenivasa

0 Kallikuppa Sreenivasa 8 months ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 198979 points

Hello Jagadeesh

Based on quick check, i am not able to see any noticable error.

Couple of suggestions

Can you reduce the 1K series resistors connected between bootmode resistors and the bootmode input of SOC 4 X 4 resistor arrays to 0R. RA4..RA6

Can you measure the clock output connected to SOC ( confirm the parallel R and C are DNI)

Could you configure the boot switch to boot mode, set115K baud and verify if you can see C characters being sent out?

Regards,

Sreenivasa

0 Kallikuppa Sreenivasa 8 months ago in reply to Kallikuppa Sreenivasa

TI__Guru**** 198979 points

Hello Jagadeesh

I did not hear from you, i assume you are able to make some progress.

Regards,

Sreenivasa

0 Jagadeesh Pichandi 8 months ago in reply to Kallikuppa Sreenivasa

Prodigy 30 points

Hi Sreenivasa,

We do not have zero ohm array with that package, so ordering today and will check and revert back soon.

Also we have checked Clock connected to SOC signal name " SoC_CLKIN" and getting the clock signal properly.

Furthermore, I respectfully request technical support from Texas Instruments for debugging the board. Given our location in Bangalore, we would like to inquire whether it is possible to bring the board to the Texas Instruments office in Bangalore for debugging purposes.

Regards,

Jagadeesh

0 Kallikuppa Sreenivasa 8 months ago in reply to Jagadeesh Pichandi

TI__Guru**** 198979 points

Hello Jagdeesh,

Thank you.

Jagadeesh Pichandi said:
Furthermore, I respectfully request technical support from Texas Instruments for debugging the board. Given our location in Bangalore, we would like to inquire whether it is possible to bring the board to the Texas Instruments office in Bangalore for debugging purposes.

You need to contact the TI sales team you are working with.

regards,

Sreenivasa

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AM62A7-Q1: Custom Board Boot Up Fails