AM620-Q1: mcu only config

xiao-an lei

Part Number: AM620-Q1

Tool/software:

In the description of ti, the MCU only mode of AM62X does not support configuring the MCU as a wake-up source in version 10.00.070.04. If so, how do we configure it

5 months ago

0 Anshu Madwesh 5 months ago

TI__Mastermind 18745 points

Hello,

Please see the Userspace command directly above where you circled.

In newer SDK, the qos_latency is the contrstraint sent to the DM firmware to determine which low power mode to enter.

Best Regards,

Anshu

0 Anshu Madwesh 5 months ago in reply to Anshu Madwesh

TI__Mastermind 18745 points

Hello,

For more details about the latency constraint, see the TISCI documentation: https://downloads.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html#tisci-msg-lpm-set-latency-constraint

The number written to this SYSFS entry will determine which low power mode to enter. 100 can be used for MCU Only mode.

Thanks,

Anshu

0 xiao-an lei 5 months ago in reply to Anshu Madwesh

Intellectual 420 points

Hello,

I don't really understand how to configure the MCU ONLY in

https://downloads.ti.com/tisci/esd/latest/2_tisci_msgs/pm/lpm.html#tisci-msg-lpm-set-latency-constraint

Do I need to modify the code in the SDK of 11.00.09.04 to implement the MCU only function?

If you want to modify the source code of the SDK, please ask whether the SDK version 10.00.07.04 we use supports modifying the source code to implement MCU ONLY

0 Anshu Madwesh 5 months ago in reply to xiao-an lei

TI__Mastermind 18745 points

Hello,

As stated in the Linux SDK documentation, the only command before suspending is

echo 100 > /sys/devices/system/cpu/cpu0/power/pm_qos_resume_latency_us

https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_00_07_04/exports/docs/linux/Foundational_Components/Power_Management/pm_low_power_modes.html#mcu-only

There are no other changes required.

Thanks,

Anshu

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AM620-Q1: mcu only config