Re: gpioctl on the ODROID C2

[Vincent DEFERT <vincent.defert%posteo.net@localhost>]

You're right, it works in single-user mode.
That's really annoying.

How is that enforced?
I've had a look at gpioctl.c, gpio.c and mesongxbb_pinctrl.c and they 
don't even contain the word 'secure'...


On 07/07/2025 18:00, Brad Spencer wrote:
> Vincent DEFERT <vincent.defert%posteo.net@localhost> writes:
>
> > I'm trying to use the GPIO of the ODROID C2 (as root) but I get an
> > "Operation not permitted" error whatever I do.
> >
> > For instance, when I issue: gpioctl gpio0 set out pp
> > I get gpioctl: GPIOSET: Operation not permitted
> >
> > Interestingly, gpioctl gpio0 list doesn't list anything.
> >
> > dmesg says:
> >
> > [     1.000000] mesonpinctrl0 at simplebus5: Meson GXBB periphs GPIO
> > [     1.000000] gpio0 at mesonpinctrl0: 119 pins
> >
> > ls -l /dev/gpio0 shows:
> >
> > crw-rw-r--  1 root  _gpio  173, 0 Jun 13 03:42 /dev/gpio0
> >
> > Is there anything special I should do to be able to use gpioctl?
>
> securelevel might be in the way.  If possible, try gpioctl in single
> user or arrange for securelevel to be -1, such as compiling a INSECURE
> kernel.