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le_potato [2023/04/08 22:08] – millerjsle_potato [2024/11/14 02:30] (current) – external edit 127.0.0.1
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 ====== Libre Computing AML-S905X-CC ====== ====== Libre Computing AML-S905X-CC ======
 ===== Resources ===== ===== Resources =====
 +  * Product page: https://libre.computer/products/aml-s905x-cc/
 +  * Pin definitions: https://docs.google.com/spreadsheets/d/1U3z0Gb8HUEfCIMkvqzmhMpJfzRqjPXq7mFLC-hvbKlE/edit#gid=0
 +  * Schematic: {{ ::s905x_6l_170707_v1_0.pdf |}}
 +  * S905X Datasheet: {{ ::s905x_datasheet_v0.3-20170314-wesion.pdf |}} (There is almost certainly a newer version, but this is the one I see the most floating around on the web)
 ===== Notes ===== ===== Notes =====
 ==== Enable UART-A ==== ==== Enable UART-A ====
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   - Clone, build, and install the libretech-wiring-tool   - Clone, build, and install the libretech-wiring-tool
-  - Enable the DTO for UART-A <code> +  - Enable the DTO for UART-A ''sudo ldto enable uart-a'' 
-sudo ldto enable uart-a +  - Check dmesg ''c11084c0.serial: ttyAML6 at MMIO 0xc11084c0 (irq = 49, base_baud = 1500000) is a meson_uart''
-</code> +
-  - Check dmesg <code>c11084c0.serial: ttyAML6 at MMIO 0xc11084c0 (irq = 49, base_baud = 1500000) is a meson_uart</code>+
   - Test with ''minicom'' or whatever   - Test with ''minicom'' or whatever
-  - To persist after reboot, merge: <code>sudo ldto merge uart-a</code>+  - To persist after reboot, merge: ''sudo ldto merge uart-a'' 
 + 
 +Somewhat confusingly, both ''uart-a'' and ''uarta'' exist as device tree overlays. ''uarta'' maps to ''uart-a-rts-cts'' which uses pins 16 and 18 for hardware flow control. 
 +==== Enable i2c and the DS3231 ==== 
 +Specifically, SDA and SCL pins on GPIOs 3 & 4. 
 + 
 +  - Clone, build, and install the libretech-wiring-tool as above 
 +  - Install i2c tools: ''sudo apt install i2c-tools'' 
 +  - Enable the i2c-ao DTO: ''sudo ldto enable i2c-ao'' 
 +  - Check for your devices: ''i2cdetect -y 1'' (DS3231 should be at 0x68) 
 +  - Enable for DS3231 on i2c-ao: ''sudo ldto enable i2c-ao-ds3231'' 
 +  - Check dmesg: <code>[ 4024.485534] rtc-ds1307 1-0068: SET TIME! 
 +[ 4024.488196] rtc-ds1307 1-0068: registered as rtc0 
 +[ 4024.489394] rtc-ds1307 1-0068: setting system clock to 2000-01-01T01:07:25 UTC (946688845)</code> 
 +  - Merge to save: ''sudo ldto merge i2c-ao ; sudo ldto merge i2c-ao-ds3231'' 
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