i.MX ProcessorsのトピックRe: imx8mn uart1 not getting probed after booting into android/linux

imx8mn uart1 not getting probed after booting into android/linux

tylernol — Wed, 20 Oct 2021 17:50:04 GMT

I am enabling uart1 as is on a board based on the imx8mn evk:

&uart1 { /* BT */

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_uart1>;

assigned-clocks = <&clk IMX8MN_CLK_UART1>;

assigned-clock-parents = <&clk IMX8MN_SYS_PLL1_80M>;

fsl,uart-has-rtscts;

status = "okay";

};

it shows under /proc/device-tree/soc@/... as status okay as well.

however, only uart2 is getting probed:

artemis_evk_8mn:/proc/tty # cat /proc/tty/driver/IMX-uart

serinfo:1.0 driver revision:

1: uart:IMX mmio:0x30890000 irq:33 tx:20 rx:0 RTS|DTR|DSR|CD

I have also enabled it for a53 use under android trusty.

this is branch imx-android-11.0.0_1.0.0

any thing else to check? thanks!

Re: imx8mn uart1 not getting probed after booting into android/linux

Rita_Wang — Thu, 21 Oct 2021 10:06:15 GMT

The default use is the UART2 on i.MX8MN EVK board.

Re: imx8mn uart1 not getting probed after booting into android/linux

tylernol — Thu, 21 Oct 2021 20:11:22 GMT

yes and UART2 works fine. I also want UART1.

poking around in the source for branch imx-android-11.0.0_2.0.0, I see that the android trusty imx RDC init code also puts UART1 in the A53 domain as I want, so I suspect my fix in branch imx-android-11.0.0_1.0.0 is correct.

Re: imx8mn uart1 not getting probed after booting into android/linux

Rita_Wang — Fri, 22 Oct 2021 03:21:21 GMT

You can refer to this thread to modify https://community.nxp.com/t5/Blogs/How-to-Change-i-MX8MM-evk-Linux-Debug-UART/ba-p/1243938