On Tue, Oct 9, 2018 at 9:59 AM Fred Gomes <[email protected]> wrote:
>
> The problem is that I need to configure the pins P28 - P31 (Because I am 
> using the SPI1) and when I ran "config-pin  P9.31 spi_sclk" I got the 
> following error: "Cannot write pinmux file: 
> /sys/devices/platform/ocp/ocp*P9_31_pinmux/state". The same happens for pin 
> P9.28 and P9.29. They seem to not exist in the pinMux list.

P9.28, P9.29, and P9.30 are tied to HDMI audio..

Add this option to /boot/uEnv.txt

disable_uboot_overlay_audio=1

Regards,

-- 
Robert Nelson
https://rcn-ee.com/

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