topic Re: Disable UART Runtime in i.MX Processors

Disable UART Runtime

mathew_k_t — Mon, 18 Nov 2019 06:06:35 GMT

Hi,

I'm working with i. MX6ULL board. I would like to disable debug UART in runtime. How to implement this?

Thanks in advance.

Re: Disable UART Runtime

igorpadykov — Mon, 18 Nov 2019 09:20:58 GMT

Hi mathew_k_t

one can look at general linux suggestions provided on

c++ - How to disable cout output in the runtime? - Stack Overflow

Disable Console Output from External Program (C++) - Stack Overflow

Best regards
igor
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Re: Disable UART Runtime

mathew_k_t — Wed, 20 Nov 2019 06:31:27 GMT

Thank you Igor for your response.

I have gone through the link you provided. I found that those information is for redirecting or stopping debug messages.

But my requirement is different. I would like to disable the UART itself. We have a UART for log in and access sysfs entries. I want to disable this to avoid unauthorized access. I'm looking for a solution other than changing the log in password.

On checking the datasheet, I found UART_Enable bit in the UART Control register1. How can I use that? Is it a solution for what I'm looking for?

Thanks and Regards

Re: Disable UART Runtime

igorpadykov — Wed, 20 Nov 2019 08:30:20 GMT

Hi mathew_k_t

one can also try to gate uart clocks with CCM_CCGRn

registers.

Best regards
igor