alr
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alr's post in Share UART7 GPIO i20/i21 pins was marked as the answer
Thanks again for the idea!
I finally got the UART7/GPIO shared pins working without problems. I´m using gpio_lib.
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alr's post in No audio in A20. was marked as the answer
OK the problem was the Shutdown pin in the external amplifier. The values that the sunxi-codec driver sends to the GPIO pin are switched.
I have to patch the sunxi-codec driver to allow the analog output sound work.