i.MX8M POR when 'reboot'

[LinhNguyen]

Hi,

I want to use PSTORE to store kernel panic log into RAM on i.MX8M board. Everything works except the board causes POR instead of software reset whenever panic happens or 'reboot' command.

Tested on some i.MX8M boards (Nitrogen8m, Technexion PICO 8M) and Jetson nano. 'reboot' command on Jetson Nano causes software reset, but same command on i.MX8M always causes POR.

Anyone knows why i.MX8M always causes POR on kernel panic or 'reboot' command?

Thank you.

[LinhNguyen]

Thank you Igor.

I saw the same behavior about POR on reboot command on all platforms I have (Technexion PICO PI IMX8M and IMX8M-mini, Boundary Nitrogen8m SOM, MYD JX8M). None of them supports warm reboot.

Is there any special reason that all i.MX8M platforms don't support warm reboot?
Thank you.

[igorpadykov]

Hi Linh

reason for such behavior may be that in i.MX8MQ EVK reset is implemented through

signal nWDOG U704, PMIC_ON_REQ on p.10 SPF-38820 EVK schematic, resetting pmic

U702A and all board.

Design Files for the i.MX 8M Evaluation Kit (EVKB)

Best regards
igor