On Fri, 2017-09-01 at 09:12 +0800, Lai Eddy wrote:
> I have just build and run Yocto(Pyro 2.3.1) Linux on my Xeon D1500
> board,
> I want to use the SOC's GPIO pins for a push button, so I use
> "bitbake linux-yocto -c menuconfig" to enable the
> "Device Drivers"-->"GPIO Support"-->"sysfs interface", and also
> enable the "Intel ICH GPIO"
> after the kernel boot on the board, there's a gpiochip available:
> # cd /sys/class/gpio/
> # ls
> exportgpiochip436 unexport
> # more gpiochip436/ngpio
> 76
> but I got an error when I issue the command to export GPIO#1
> # echo 436 > export
> -sh: echo: write error: No such device or address
> # echo 437 > export
> -sh: echo: write error: No such device or address
>
> is there kernel miss configured or something wrong on the operation?
>
Can you also verify with the output of dmesg that the gpio device is
initialized?
Sau!
> Eddy Lai
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