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PROCESSOR-SDK-AM437X: Automatic reboot after shutdown.

kazuki
Prodigy 60 points
Part Number: PROCESSOR-SDK-AM437X
Other Parts Discussed in Thread: AM4376, TPS65216

Tool/software:

Hi

We are developing the custom board with AM4376 based on AM437x-EVM.
SDK : PROCESSOR-SDK-AM437X-06.03.00.106

To fix the frequency to 1GHz, we changed the device tree as below.

 		dcdc2: regulator-dcdc2 {
 			regulator-name = "vdd_mpu";
-			regulator-min-microvolt = <912000>;
-			regulator-max-microvolt = <1378000>;
+			regulator-min-microvolt = <1298500>;
+			regulator-max-microvolt = <1351500>;
 			regulator-boot-on;
 			regulator-always-on;
 		};

This change is causes the automatic reboot after we execute the "poweroff" command.
Before this change, the "poweroff" command works normally.
(No automatic reboot.)

Could you please let us know why this change causes this issue?

We are using TPS65216 as PMIC. It is changed from AM437x-EVM.

Thanks.

Best regards,

  • 0
    TI__Guru**** 173441 points

    Hi Kazuki,

    there are other ways to fix the frequency to 1GHz. Instead of modify the region of dcdc2 in kernel devicetree, can you please remove opp50-300000000 to oppturbo-800000000 in cpu0_opp_table in kernel devicetree, and only keep oppnitro-1000000000 to see the board still have the auto reboot problem?

  • 0 in reply to Bin Liu
    Prodigy 60 points

    Hi

    We just change cpu0_opp_table and keep oppnitro-1000000000.
    The board still has the auto reboot problem.

    If we don't change the device tree and set "scaling_setspeed" to fix the frequency to 1GHz with the following commands,
    the board have no the auto reboot problem.

    echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 1000000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

    We don't know why changing the device tree causes the auto reboot problem.

    Do you have any ideas?

  • 0 in reply to kazuki
    TI__Guru**** 173441 points

    Hi Jazuki,

    Can the issue be reproduced on the EVM?

  • 0 in reply to Bin Liu
    Prodigy 60 points

    Hi,

    We cannot reproduce this issue with on the EVM.

    Does using TPS65216 as PMIC have any effect?

  • 0 in reply to kazuki
    TI__Guru**** 173441 points

    I don't have enough information yet to conclude if the PMIC is the problem.

    In both of the working and failure case on your board, can you please probe the PMIC power rails during Linux boot, to see if there is any difference?