> The pinmux registers are protected by the Linux kernel and cannot be
> written to by normal user code.
That's not entirely correct. The pad contol registers in the Control Modul
are protected. But rather than by the Linux kernel, they're protected by
hardware (the CPU). You cannot write access them by the PRUSS. Only
supervisor access by the host CPU can change the values.
I used ("chmod 777 pinmode") to change the permissions. but the problem
> of writing is still remain
>
To adapt pinmuxing, your code has to run under root privilegues. Usually
pinmuxing doesn't change at run time. So you can execute such code in the
boot sequence.
BR
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