[Dinesh S]

Hi Sir,

Thank you for pointing me to the references and sharing the insights.

I have already reviewed the configurations mentioned in the links, including the device tree and clock settings, as well as the DMA usage for the UARTs. I have tested multiple scenarios, such as disabling the use of DMA for the UARTs and rechecking the clock configurations thoroughly, but unfortunately, I am still unable to get any UART devices initialized.

The kernel continues to show the same error (probe of {40018000.serial} failed with error {-22}), indicating that the issue persists. If you have any further suggestions or specific debugging steps that could help pinpoint the root cause, I would greatly appreciate it.

Best regards,
Dinesh

[Dinesh S]

[    2.465043] stm32-usart: probe of 40018000.serial failed with error -22
[    2.471995] stm32-usart: probe of 40019000.serial failed with error -22
[    2.478636] stm32-usart: probe of 5c000000.serial failed with error -22

i am getting error like this sir

• This reply was modified 1 month ago by Dinesh S.

[Dinesh S]

Thank you sir. but what need to do for the gpio reading from cm4 sir?

[Dinesh S]

Thank you for your response sir. we solved that issue.

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