On the AML-S905X-CC (Le Potato) how does one make use of the GPIO UART headers

[nbe1233]

On the AML-S905X-CC (Le Potato) how does one use the gpio uart headers. In dmesg I see that ttyAML0 is a serial port. Is ttyAML0 the gpio uart headers?

[Da Xue]

On 8/9/2021 at 1:17 AM, nbe1233 said:

On the AML-S905X-CC (Le Potato) how does one use the gpio uart headers. In dmesg I see that ttyAML0 is a serial port. Is ttyAML0 the gpio uart headers?

ttyAML0 is on header 2J1 and it's by default the debug UART

 

You can enable additional UARTs by download this: https://raw.githubusercontent.com/libre-computer-project/libretech-overlays/for-4.13.y/overlays/meson-gxl-s905x-libretech-cc-uarta.dts and using armbian-add-overlays.

 

UART A is on pin 8 and 10. See the header reference: https://docs.google.com/spreadsheets/d/1U3z0Gb8HUEfCIMkvqzmhMpJfzRqjPXq7mFLC-hvbKlE/edit?usp=sharing

[michaels]

Hi

I also want to use the UART on the 40 pin header pins 8 and 10 of the AML-S905X-CC (Le Potato).

I have customized overlays before on the Beaglebone black. 

While the links above are helpful, where can I download the devicetree overlay package.

Is there a tutorial or some documentation on the process.

Thanks