STM32MP15x: NRST doesn't work after login prompt occurs

[Dat Tran]

Hi,

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We are working on STM32MP151, with custom linux, no PMIC.

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We have a reset button connect to NRST line, it works fine in Uboot or during linux boots. But right after the login prompt occurs, the reset button is nolonger work. When we hit the button, system seems crashed, no response from command prompt. We have to disconnect power and reconnect again.

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Does anyone have experience with it?

many thanks.

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[Dat Tran]

is there any idea please?

[PatrickF]

Hi @Community member​ 

If your solution does not use STPMIC1, there is a Limitation which could be the root cause of your issue.

Please have a look to ES0438: 2.3.5 Incorrect reset of glitch-free kernel clock switch

See also AN5031 which show the recommended HW if your power solution does not make a power cycle upon NRST activation.

Regards

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[Dat Tran]

Thank you so much, we will take a look at let you know.

[Dat Tran]

Hi @PatrickF​ , we changed our module as your suggestion and the reset button works perfectly.

Thank you so much for the information.