SK-AM62-LP: LPM UART AWAKE in SK-AM62-LP sample

Hello,

Does this also occur with using RTC as the wakeup source?

Please share any changes made to the device tree and the MCU IPC firmware.

MCU UART wakeup is handled by the MCU IPC firmware.

Thanks,

Anshu

Hi, There is no changes, the binary is original download from TI website. Currently, i'm only using prebuild image and binary. How to make RTC as the wakeup source. Is it like the example LPM DMTimer Wakeup?

Hi Anshu,

I found some guideline for RTC as wakeup source and the result is in the picture below. It still not wake up and reset the system after around 2-3min.

Any advises

Hi Anshu, 

Can you provide this file k3-am625-sk-lpmdemo.dtb ?

Thanks,
CWL

Hi Anshu,

Alternative way, can you please provide me all the required .appimage (m4, r5, a53, linux), either methods load by uart_bootloder.py python script or flash NOR/NAND by uart_uniflash.py) python script into SK-AM62-LP and linux command to make either deep-sleep or mcu-only LPM mode to work?

Please advise or suggest alternative way if you have any ideas. Thanks.

Best Regards,
CWL

hi Anshu,

I'm also trying to graceful shutdown of remote core from Linux. But it seems the remote core M4 is not response to the echo stop > /sys/class/remoteproc/remoteproc0/state command from Linux. Log as below. Do you have any hints to help?

Hello,

CWL said:

I found some guideline for RTC as wakeup source and the result is in the picture below. It still not wake up and reset the system after around 2-3min.

This information is from an old SDK version. Please use the SDK documentation for your version: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/11_00_09_04/exports/docs/linux/Foundational_Components/Power_Management/pm_low_power_modes.html

CWL said:

Currently, i'm only using prebuild image and binary

Which Image are you using? The default image or something else?

Can you clarify you are using SBL or SPL boot? LPMs are not support with SBL boot.

Thanks,

Anshu

Hi Anshu,

Is there any expected current consumption for all the available low power mode of SK-am62-lP?

Hi Anshu, 

Currently my evk is a GP devices. As following the link provided above, there is a limitation in GP devices.


But I have a FATAL response as picture below. Any advise ?

Hello,

I'm not sure if LPMs have been tested with GP devices. I'll need to check internally and get back to you.

Please refer to the AM62x Power Consumption App Note for information about power consumption: https://www.ti.com/lit/an/spradg1/spradg1.pdf

Partial I/O mode will be < 1mW power consumption. 

Thanks,

Anshu

Hello,

The latest SDKs don't support GP silicon anymore so we haven't tested LPMs with GP silicon.

There was a known bug with LPMs with GP silicon a few years ago that was patched with this commit: https://github.com/OP-TEE/optee_os/commit/31b38740db7f78bcd11b62e19a16fb4fcab64b03

You can try adding this patch and re-building the OPTEE but there is limited support we can provide.

Thanks,

Anshu