Why GPIO3_PI.01(NFC_INT) is busy?

Autonomous Machines Jetson & Embedded Systems Jetson Nano
#1

Hi all,

My nfc_int_pi1 node is config as below,

nfc_en_pi0 {
                                nvidia,pins = "nfc_en_pi0";
                                nvidia,function = "rsvd0";
                                nvidia,pull = <0x0>;
                                nvidia,tristate = <0x0>;
                                nvidia,enable-input = <0x0>;
                        };

But when I use " root@linux:/home/sercomm# echo 64 > /sys/class/gpio/export" command on our customized board base on the Nano production moudle, it turns out failure.

root@linux:/home/sercomm# echo 64 > /sys/class/gpio/export
    bash: echo: write error: Device or resource busy

But with the same Image and dtb in our Nanno devKit, it is Okay.

What makes it happen?

#2

hello garretzou,

since you’re develop a customized board, had you refer to Jetson Nano Product Design Guide for recommendations and guidelines.
you may also access Jetson Nano Pinmux to have customize and to update the board configuration files.
thanks

#3

The Jetson Nano Pinmux 1.01 is not for R32.3.1.

Thanks

#4

right, we’re now prepare the updated version of Nano pinmux spreadsheet.