Can't export gpio

[Robin_faith]

Hi Vick
This is a case I’ve seen with other developers：

Xavier industrial gpio device or resource busy

Our customized carrier board use 4 x gpio, two of which are occupied,but I did not use these GPIOs for other functions. [image] Calculate the GPIO number from the Pinmux table GPIO4- 290; GPIO5 -503;GPIO20 -291;GPIO21-288 gpiochip2: GPIOs 240-247, parent: platform/max77620-gpio, max77620-gpio, can sleep: gpio-246 ( |gpio_default ) out hi gpio-247 ( |gpio_default ) out hi gpiochip1: GPIOs 248-287, parent: platform/c2f0000.gpio, tegra-gp…

After using echo 56> /sys/class/gpio/export command to control GPIO, it prompts that the device is busy

We calculated the mapping address of GPIO3_PI.00 as 56 (group=0, bank=8, offset=0) according to the guidance in the forum But when I input echo 56> /sys/class/gpio/export, it prompts that the device is busy. What is the reason? How to solve it? Thank you

Are the pin definitions for SDK and PDK the same with same soc?

I’m not sure if SDK is mean Nvidia hardware design , and PDK is customers modify based on NVIDIA solutions？