On Thursday, March 23, 2017 at 8:09:37 PM UTC+5:30= , Daniel Baluta wrote:

On Thu, = Mar 23, 2017 at 4:21 PM, SIMRAN SINGHAL
<singhal...@gmail.com> wrote:
>
>
> On Monday, October 17, 2016 at 5:19:49 AM UTC+5:30, Eva Rachel Ret= uya wrote:
>>
>> On Sun, Oct 16, 2016 at 02:23:58PM -0700, Elizabeth Ferdman wr= ote:
>> > On Sun, Oct 16, 2016 at 10:04:27AM +0800, Eva Rachel Retu= ya wrote:
>> > > Hi Liz,
>> > >
>> > > On Sat, Oct 15, 2016 at 02:07:49PM -0700, Elizabeth = Ferdman wrote:
>> > > ----massive snip----
>> > > > I think that running $ make -j2 && sudo= make modules_install could
>> > > > solve
>> > > > this problem? If I can't do insmod can I ju= st do modprobe?
>> > > >
>> > >
>> > > modprobe is OK to use.
>> > >
>> > Thanks, I used modprobe and the modules were loaded.
>> >
>> > I'm running into this issue in Task 01
>> > When I do 'ls -l /config/iio/devices/dummy/' the = terminal just hangs. I
>> > closed the terminal and tried it a few more times but it = was just
>> > freezing and I had to xkill it. I have been following the= tutorial. I
>> > mounted the configfs at /config, made the modules, loaded= them, ran
>> > mkdir /config/iio/devices/dummy/my_dummy_device.
>> >
>>
>> Hi,
>>
>> I suggest to do 'make clean' again and start from scra= tch.
>> Run 'make menuconfig' and make sure the settings look = like this:
>> {*} Industrial I/O support ---> (instead of module, make th= is built-in,
>> use 'y' instead of 'm')
>> <Descend this option where you'll configure configfs, d= ummy, etc>
>> {*} Enable IIO configuration via configfs (use 'y' ins= tead of 'm')
>> <M> Enable software IIO device support
>> <M> Enable software triggers support
>>
>> Under IIO dummy driver:
>> <M> An example driver with no hardware requirements
>> [*] Event generation support
>> [*] Buffered capture support
>>
>> Compile and install, then boot to that kernel and test if it w= orks.
>
>
> Hi,
>
> I am able to insert module iio_dummy_evgen.ko but when I run
> $ sudo insmod iio_dummy.ko
>
> I got the following error:
> insmod: ERROR: could not insert module iio_dummy.ko: Unknown symbo= l in
> module
>
> And in dmesg I am getting following error:
> iio_dummy: Unknown symbol iio_register_sw_device_type (err 0)
>
> Any Idea?

Find the .c file which exports this symbol. Then look into the Makefile= from the
same directory where you found the .c file and find the CONFIG_ symbol = which
compiles the .c file.

=C2=A0Hi,

it worked for me using modprobe.
=

Daniel.