Linux freezes when A53_CORE_POR_RESET0 is set to 1.

[Takashi_Kashiwagi]

Hi Community.

I am trying to reset the CA53 core from the CM4 core based on the advice of thread [ What happens to the boot sequence when CA53 Core0 is software reset?  ], but it doesn't work.

When Linux freezes, Linux sometimes outputs a register dump and sometimes does not.

Do I need to do anything special to reset Linux?

Best Regards,

T.Kashiwagi

[igorpadykov · Accepted solution]

Hi Takashi

only reliable linux reset option is through whole board reset as it is done

with signal "nWDOG" --> UM805RE (U704) and working as "PMIC_ON_REQ"

in i.MX8M EVK schematic

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

Other options are not reliable and may cause linux freezing,

one can check comments to set_wdog_reset()

soc.c\imx8m\mach-imx\arm\arch - uboot-imx - i.MX U-Boot 

Best regards
igor
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[Takashi_Kashiwagi]

Hi  Igor.

Thank you for the prompt response.

only reliable linux reset option is through whole board reset as it is done with signal "nWDOG" --> UM805RE (U704) and working as "PMIC_ON_REQ"

OK. As a reminder, the contents of SNVS_LP General Purpose Registers 0 .. 3 are not cleared, right?

Other options are not reliable and may cause linux freezing, one can check comments to set_wdog_reset()

Thank you. This is very helpful. I will try it.

Best Regards,

T.Kashiwagi