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

I have tried a couple of O/S like Raspbian Stretch Headless and Armbian, and while the boot and work fine, there seems to be no support for the on board UART on the 40 pin header.

I am happy to use any O/S which can provide this.

Do I need to use Device Tree Overlays to enable this?
If so, where can I download the devicetree overlay package and is there a tutorial or some documentation on the process.

If not, how can I use this onboard UART?

Thanks

ADL
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3 Answers3

1

This is what I do

ROOT###### ARNBIAN ONLY

wget https://raw.githubusercontent.com/libre-computer-project/libretech-overlays/for-4.13.y/overlays/meson-gxl-s905x-libretech-cc-i2c-ao.dts

sudo armbian-add-overlay meson-gxl-s905x-libretech-cc-i2c-ao.dts

end ROOT #####

If Ubuntu

git clone https://github.com/libre-computer-project/libretech-wiring-tool.git


cd libretech-wiring-tool
 

sudo make
Petter Friberg
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brad wigton
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  • Hi I'm guessing two different code block in base of system, if not check the edit (you can see there how you can format code) – Petter Friberg Sep 19 '22 at 16:08
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It works for me:

wget https://raw.githubusercontent.com/libre-computer-project/libretech-overlays/for-4.13.y/overlays/meson-gxl-s905x-libretech-cc-uarta.dts

sudo armbian-add-overlay meson-gxl-s905x-libretech-cc-uarta.dts

python3 -m serial.tools.miniterm

--- Available ports:
--- Enter port index or full name:

Never port appears, but the uarta is working in /dev/ttyAML6.

python3
Python 3.10.6 (main, Nov 14 2022, 16:10:14) [GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

    >>> import serial
    >>> ser = serial.Serial()
    >>> ser.baud = 9600
    >>> ser.port = '/dev/ttyAML6'
    >>> ser.open()
    >>> ser.write(str.encode('test'))
    4
    >>>

Serial comm over the port /dev/ttyAML6 works!

Tyler2P
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RAUL GARCIA
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I too was looking for an answer to this and led me here. I know this is older, but I wanted to share what I found to maybe help someone else out. While using the Raspbian port from libretech, you can use the ldto overlay to enable the uart.

sudo ldto enable uart-a

It's part of the wiring tool referenced in the first reply and it appears to be the same .dts file that the other reply mentions. It maps to the referenced /dev/ttyAML6.

Using ldto list listed the overlays available.

listed here:

https://github.com/libre-computer-project/libretech-wiring-tool/tree/master/libre-computer/aml-s905x-cc/dt

John A
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