Has anyone attempted to enable GPIOLIB support? Trying to enable support for the pcf8575 I2C GPIO expander requires GPIOLIB to be enabled, however, I am getting compilation errors referring to:
/linux-2.6/drivers/gpio/gpiolib.c:57: error: `ARCH_NR_GPIOS' undeclared here (not in a function) After doing alot of searching I find that ARCH_WANT_OPTIONAL_GPIOLIB must be selected witch I have done via: config ALTERA_DE2 bool "Altera DE2 Development board support" depends on NIOS2 select ARCH_WANT_OPTIONAL_GPIOLIB help Support for the Altera Cyclone Development board. Includes support for 10/100 ethernet, FLASH, SDRAM, VGA, I2C. There seems to be more required but I am not sure where? I am using the 188.8.131.52 kernel. Thank you.