Suspend mode on 1051

[michael_fraller]

Hello,

I am currently working on power mode switching on an i.MXRT1051.
Therefore I am evaluating the power modes on the EVKB-IMXRT1050 board.

If my understanding is correct, after a resume from the suspend mode the MCU does not continue after the WFI instruction. The MCU will instead be reset. This is also the behavior of the demo app.

If secure boot (HAB) is enabled on the MCU, what are the consequences for the wake up routine?
Does the ROM bootloader verify the image after waking up from Suspend Mode?

Best regards and many thanks.

[DanielRuvalcaba]

Hi,

I'd recommend you to take a look to AN12085. Specially section 5.2.3.

Regards,

Daniel.

[michael_fraller]

Hi,

Thanks for your fast reply! This is indeed the document I am currently studying.
Unfortunately there is no mention of secure boot.
To further clarify my question:
Does the "CPU reset wake-up" in section 5.2.3.2 mean that the ROM bootloader is booting, and a HAB image authentication is needed?

Best regards and many thanks.

[DanielRuvalcaba]

I would recommend you to take a look to the power_mode_switch SDK example. I believe it will help to understand better the suspend mode in the RT1050.

I hope this helps!

Regards,

Daniel.