topic Re: UART5 Configuration - sb-fx6 in i.MX Processors

UART5 Configuration - sb-fx6

andrewpalmer — Fri, 01 Jul 2016 15:01:35 GMT

Hi,

I have built a linux yocto image to target a sb-fx6 evaluation kit which works and boots fine. However when linux has booted I only get access to the command console serial port. What I wish to do is configure UART 5 on this board so that linux will recognize it as a serial port.

I realize I need to configure the pins appropriately (because they a multiplexed) but being in fairly unfamiliar territory I have failed to find a suitable example to follow.

From the reference manual I have identified the pad names (UART5_RX_DATA and UART5_TX_DATA) and the registers (IOMUXC_UART5_UART_RS_DATA_SELECT_INPUT ...) but I don't how to apply this to the linux kernel and do a build.

If any one can help point me in the right direction that would be greatly appreciated.

Re: UART5 Configuration - sb-fx6

igorpadykov — Mon, 04 Jul 2016 00:13:54 GMT

Hi Andrew

Sabre AI board uses uart4 and one can look at its configuration in

files uboot/include/configs sabre ai board uart4 mx6qsabreauto.h

(used kernel boot parameter console=ttymxc3,115200)

and imx6qdl-sabreauto.dtsi

http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi?h=imx_4.1.15_1.0.0_ga

just for reference attached Porting Guide.

Best regards

igor

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Re: UART5 Configuration - sb-fx6

andrewpalmer — Mon, 04 Jul 2016 10:22:44 GMT

Thanks Igor,

I think I have found the relevant file;

/arch/arm/boot/dts/imx6qdl-cm-fx6.dtsi

This file has an entry in it for the command console;

/* pins for console */

pinctrl_uart4: uart4grp {

fsl,pins = <

MX6QDL_PAD_KEY_COL0__UART4_TX_DATA 0x1b0b1

MX6QDL_PAD_KEY_ROW0__UART4_RX_DATA 0x1b0b1

};

...

/* console */

&uart4 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_uart4>;

status = "okay";

};

Can I simply add to this file to define uart5? something like;

/* pins for uart5 */

pinctrl_uart5: uart5grp {

fsl,pins = <

MX6QDL_PAD_KEY_COL0__UART5_TX_DATA 0x1b0b1

MX6QDL_PAD_KEY_ROW0__UART5_RX_DATA 0x1b0b1

};

...

/* my uart5 serial */

&uart5 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_uart5>;

status = "okay";

};