AM62 UART
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UART
UART Overview
The exposes up to seven LPUART interfaces, some of which are multiplexed with other peripherals.
| Serial Port | Device Node | Device Tree | Note |
|---|---|---|---|
| UART0 | /dev/ttyS0 | main_uart0 | Connected to Symphony board serial console |
| UART2 | /dev/ttyS2 | main_uart2 | Connected to Symphony board J18.7 and J18.9 |
| UART5 | /dev/ttyS5 | main_uart5 | Used on SOM for Bluetooth interface and can be accessible only if the [/blob//recipes-connectivity/bcm43xx-utils/bcm43xx-utils/imx93-var-som/variscite-bt variscite-bt] Systemd service is disabled or SOM without "WBD" and "WB" |
| UART6 | /dev/ttyS6 | main_uart6 | Connected to Symphony board J18.3 and J18.5 |
Testing UART0
Short J18.7 and J18.9 pins and run the following commands:
# stty -F /dev/ttyS0 -echo -onlcr 115200 # cat /dev/ttyS0 & # echo hello > /dev/ttyS0
For each invocation of echo command the "hello" string should appear on the terminal.
Testing UART6
Short J18.3 and J18.5 pins and run the following commands:
# stty -F /dev/ttyS6 -echo -onlcr 115200 # cat /dev/ttyS6 & # echo hello > /dev/ttyS6
For each invocation of echo command the "hello" string should appear on the terminal.
Disabling UART6
To disable UART5 edit arch/arm64/boot/dts/ti/ under kernel source directory and modify
&main_uart6 {
...
status = "okay";
};
to
&main_uart6 {
...
status = "disabled";
};
Other UARTs can be disabled in a similar manner by referencing the table above.