[Gumstix-users] Using GPIO114 as output - can it be done?

[Chris C. <Cot...@ya...>]

Hi all,
I have been trying to use GPIO114 as an output, and failing.  I've checked
the pinmux in u-boot (pin is set to Mode 4), and edited board-overo.c so
that it is no longer used as OVERO_GPIO_PENDOWN.  The kernel lets me export
the pin to userspace and set it as an output.  However setting it high or
low has no effect.  The kernel claims that the pin is set 'high' when I read
it back after setting it, but it is still outputting 'low'.  If set the pin
as an input and attach a signal, I can read its state correctly.  In case it
is significant, I am currently running kernel 2.6.32.

I have also tried setting the line as an output and driving it high in
u-boot; this also appears to have no effect.

I've set the pinmux and configuration for many other pins without problems;
is there anything else 'special' about GPIO114 which prevents me from
driving it as an output, or have I missed something hidden in the
configuration files somewhere?  I'm beginning to wonder whether the Gumstix
has an input - only buffer or something else attached to this pin.  

Thanks in advance,
Chris Cotton.
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