Xeon D-1559 Circuit Board Restarts Instead Of Shutdown

[Siddhartha]

Hi.

We have made a custom circuit board using the Xeon D-1559 processor.

Whether we use Windows 10 / CentOS 8 (Linux):

1. Our attempts to shutdown (poweroff) through GUI & command line don't work.

    1.1. The circuit board goes through the usual steps to shutdown.

    1.2. But after no signal is detected by our monitor (after scanning through VGA, DVI & HDMI), after a few seconds, the board restarts.

2. The only way we can poweroff is to manually switch off the chassis which contains our circuit board. Normal & long press on the circuit board's power button also does the same restart mentioned above, instead of shutdown.

3. So far,  we've tried the following steps:

    3.1. Turned off Wake on LAN in the BIOS. We searched in the BIOS for Wake on USB, but we couldn't find such a setting.

    3.2. Tried some power management options in Windows 10 / CentOS 8 (Linux) according to suggestions we found on the Internet.

But nothing has worked. What do you advise ?

Thanks.

[Siddhartha]

Should have typed:

2. The only way we can poweroff is to manually switch off the chassis which contains our circuit board. Normal & long press on the circuit board's power button also cause the same restart mentioned above, instead of shutdown.

[Siddhartha]

Hi.

Related questions below:

    Viewing the Xeon D-1559 as a black box on a circuit board:

        1. Are there signals we can check on an oscilloscope and determine that:

            1.1.  the processor will shutdown ? (Where are these signals on the circuit board ?)

            1.2. the processor will restart ? (Where are these signals on the circuit board ?)

        2. Is there a manual / other document with descriptions of:

            2.1. the shutdown & restart process ? 

            2. 2. the signals mentioned in question 1 ?

Thanks.

[Diego_INTEL]

Hello @Siddhartha,

Thank you for contacting Intel Embedded Community.

Just to clarify, this processor is not supported anymore as you may see in the following link:

https://www.intel.com/content/www/us/en/support/articles/000022396/processors.html

As for your questions, you may check the power rails, specifically the S0 to S5-G3 sequence, you can use this document:

https://www.intel.com/content/www/us/en/secure/content-details/554566/grangeville-platform-reset-and-power-sequencing-white-paper.html?DocID=554566

But you will need a Premier account to get access to it.

Best regards,

@Diego_INTEL 

[Siddhartha]

Hi.

Thanks @Diego_INTEL. We were able to get the Reset & Power Sequencing document.

When we tried to shutdown:

    1. PLTRST_N went low & then went high. (We think it shouldn't go high.)

So we are checking our setup. If you have suggestions, please let us know.

Thanks.