Re: [Outreachy kernel] IIO Experiment #1 Build Dummy Help

[SIMRAN SINGHAL <singhalsimran0@gmail.com>]

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On Monday, October 17, 2016 at 5:19:49 AM UTC+5:30, Eva Rachel Retuya wrote:
>
> On Sun, Oct 16, 2016 at 02:23:58PM -0700, Elizabeth Ferdman wrote: 
> > On Sun, Oct 16, 2016 at 10:04:27AM +0800, Eva Rachel Retuya 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 just 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 scratch. 
> Run 'make menuconfig' and make sure the settings look like this: 
> {*} Industrial I/O support ---> (instead of module, make this built-in, 
> use 'y' instead of 'm') 
> <Descend this option where you'll configure configfs, dummy, etc> 
> {*} Enable IIO configuration via configfs (use 'y' instead 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 works. 
>

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 symbol in 
module

And in dmesg I am getting following error:
iio_dummy: Unknown symbol iio_register_sw_device_type (err 0) 

Any Idea?
 

>
> Eva 
> > These succeeded: 
> > lsmod | grep dummy 
> > ls -l /sys/bus/iio/devices/iio:device0/ 
> > ls -l /sys/bus/iio/devices/iio_evgen/ 
> > 
> > The one that's no working is 
> > ls -l /config/iio/devices/dummy/my_dummy_device 
> > or 
> > ls -l /config/iio/devices/dummy/ 
> > 
> > Liz 
> > 
> > > Eva 
> > > 
> > > > Thanks, 
> > > > Liz 
> > > > 
> > > > > thanks, 
> > > > > Daniel. 
> > > > 
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