Here is what I get with modinfo on the old driver that works and the new one that doesn't. The only difference is the srcversion which shouldn't matter. Maybe my oe build environment has some residual kernel source from 2.6.36?

appusr@appusr-VirtualBox:~/oe/user.collection/recipes/gpio-event-module/module$ modinfo /media/LINUX/lib/modules/2.6.33/kernel/drivers/gpio/gpio-event-drv.ko 
filename:       /media/LINUX/lib/modules/2.6.33/kernel/drivers/gpio/gpio-event-drv.ko
license:        Dual BSD/GPL
description:    GPIO Event Driver
author:         Dave Hylands
srcversion:     D6FC93A0939510E6EAF8C5F
depends:        
vermagic:       2.6.33 mod_unload modversions ARMv7 


appusr@appusr-VirtualBox:~/oe/user.collection/recipes/gpio-event-module/module$ modinfo /media/LINUX/lib/modules/2.6.33/kernel/drivers/gpio/gpio-event-drv.ko 
filename:       /media/LINUX/lib/modules/2.6.33/kernel/drivers/gpio/gpio-event-drv.ko
license:        Dual BSD/GPL
description:    GPIO Event Driver
author:         Dave Hylands
srcversion:     20A1072B1B75F54E1148FC9
depends:        
vermagic:       2.6.33 mod_unload modversions ARMv7 


On Wed, Mar 16, 2011 at 8:56 PM, Dave Hylands <dhylands@gmail.com> wrote:
Hi,

On Wed, Mar 16, 2011 at 6:28 AM, dtran11 <dtran11@gmail.com> wrote:
>
> Hi Dave,
>
> I switched back to 2.6.33 and am having problems with gpio-event-module.
> This is what the kernel is complaining about:
>
>   modprobe: Failed to load module gpio_event_drv: unknown symbol in module,
> or unknown parameter.
>   gpio_event_drv: disagrees about version of symbol unregister_sysctl_table
>   gpio_event_drv: Unknown symbol unregister_sysctl_table

It sounds like you're using the module built for 2.6.36 on 2.6.33.

You'll need to rebuild the kernel modules so that they match the
kernel version you're using.

You should be able to run modinfo (if it's available on your gumstix),
and the vermagic will show which kernel version a module was built to
work with.

You can also transfer the .ko file from the gumstix to your build
machine and run modinfo from the build machine.

--
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com

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