Tool/software: Linux
I make a module that using "#include <linux/gpio>" library, but it is occur unkown symbol error when i enter "insmod gpio.ko" in board.
Unknown symbol occur when i use function such as gpio_request(),gpio_direction_input(),gpio_direction_output(),gpio_to_irq()...
I think my kernel build without gpio library.
My kernel version is 4.4.32-gadde2ca9f8 and my board is beaglebone black.
What should i do? Do I need to change the kernel configuration file?
Regards,
Boo
