I want to change the console port.

[chlim]

I am working in a standalone linux build environment.

The CPU uses i.mx6 solo, and the project base uses i.mx6dl sabresd.

The debug console port from the hardware team is working on a board that has been changed from uart1 to uart3.

I changed console to uart3 in uboot and checked the logs. However, the kernel did not find a way to change it.

The current state is using mfgtools to detect the failure during download, and I want to see console for debugging.

When I run bootm from uboot and enter the kernel, I cofirmed that the value of bootarg is passed to ttymxc2.

The kernel option is CONFIG_CMDLINE = "noinitrd console = ttymxc2,115200".

I added the following code to the device tree "imx6qdl-sabresd.dtsi".

chosen {
  stdout-path = &uart1;
 bootargs = "console=ttymxc2,115200";
 stdout-path = &uart3;
};

  pinctrl_uart3: uart3grp {
  fsl,pins = <
  MX6QDL_PAD_EIM_D24__UART3_TX_DATA 0x1b0b1
  MX6QDL_PAD_EIM_D25__UART3_RX_DATA 0x1b0b1
 >;
 };

&uart3 {
 pinctrl-names = "default";
 pinctrl-0 = <&pinctrl_uart3>;
 status = "okay";
};

How do I see the console in the kernel?

Thank you for your help.

[mahi]

Does your CONFIG_CMDLINE really look like "noinitrd console = ttymxc2,115200"?

In this case remove the spaces before and after the "=".

What does your u-boot environment look like? Probably the bootargs override the kernel config.

I have boards with different console ports, but I never had to configure the "stdout-path" in the device tree. I only set the console parameter in u-boot.

[chlim]

I have verified that the boot loader prints the bootarg correctly.

I set only "noinitrd console=ttymxc0,115200" in the kernel without setting DTB, console will not be output.

[chlim · Accepted solution]

This issue has been resolved.

The problem was that I just downloaded the dtb file incorrectly.

13/5000