UART2 IMX6UL

maxime_metayer — Wed, 21 Nov 2018 17:11:03 GMT

Hi everyone,

I try to test the uart communication on my CL-SOM-IMX6UL baseboard. I make a loopback test with uart2 (/dev/ttymxc1) but it doesn't works.

I have change my Devicetree like following:

pinctrl_uart2: uart2grp {
fsl,pins = <
MX6UL_PAD_UART2_TX_DATA__UART2_DCE_TX 0x1b0b1
MX6UL_PAD_UART2_RX_DATA__UART2_DCE_RX 0x1b0b1
>;
};

&uart2 {
   pinctrl-names = "default";
   pinctrl-0 = <&pinctrl_uart2>;
   status = "okay";
};

With

dmesg | grep ttymx
I get

[ 0.000000] Kernel command line: console=ttymxc2,115200 root=/dev/mmcblk1p2 rootwait rw ip=dhcp
[ 0.360619] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 58, base_baud = 5000000) is a IMX
[ 0.362383] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 59, base_baud = 5000000) is a IMX
[ 0.363644] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 60, base_baud = 5000000) is a IMX
[ 0.942466] console [ttymxc2] enabled
[ 0.946164] 21fc000.serial: ttymxc5 at MMIO 0x21fc000 (irq = 49, base_baud = 5000000) is a IMX

Can you help me please ?   Thank you in advance.

Romain

Re: UART2 IMX6UL

igorpadykov — Thu, 22 Nov 2018 10:38:52 GMT

Hi Romain

one can try unit tests uart test:

mxc_uart_test\test - imx-test - i.MX Driver Test Application Software

with description in sect.9.23 Universal Asynchronous Receiver/Transmitter (UART)

attached Linux Manual.

Best regards
igor
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