Power sequencing issue on TX2

As I know, TX2 uses BPMP to detect power sequencing. The system can only boot successfully when power waveforms meet the requirements described in the Power Sequencing section.
I’m wondering if it’s possible to delay the detection of power sequencing, in order to avoid the power instability issue at initial power on caused by hardware problems. For example, delay the BPMP power detection by 1 second after power on.

Hi wwwaaa,

Are you using the devkit or custom board for TX2?
What’s your Jetpack version in use?

Do you mean that you want to add 1s delay in BPMP before power detection?

Hi @KevinFFF
Yes, I would like the TX2 BPMP to be able to delay the detection of power sequencing.
My Jetpack version is 4.6, and I’m using our own carrier board. Due to defects in the design and usage of this board, the power supply tends to jitter when initially powered on, which may cause the power sequencing to fail to meet boot conditions and prevent successful boot.
The power supply on the board stabilizes after 1 second. So I’m wondering if it’s possible to configure the BPMP to delay power supply monitoring by 1 second, in order to allow the TX2 to boot properly.

Hi @KevinFFF

I’m looking forward to your reply.

Hi wwwaa,

Sorry, the modified bpmp fw is not verified and we won’t provide this to user.
Could you help to refer the design guide and the devkit for power sequence?

Can I modify the bpmp firmware myself?

bpmp firmware is not open source. So it cannot be modified.

how about configuring the MB1 Boot Configuration Table, is it possible to fulfill my needs

You could configure the MB1 configuration files, but it seems no related items for delaying boot time.

When powering up the TX2, if the power supply is found not meeting the sequencing requirements, the TX2 will enter what state?

You could check the serial console log and know what’s its current state.

which console? tx2 debug uart or bpmp debug uart

You could refer to the following instruction to get the serial console log.
Serial Console - NVIDIA Jetson TX2 - JetsonHacks

If you are using the custom board, you may ask the vendor for the serial console output.

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