The Industrial Raspberry Pi Forum

Hello,

I'm Roberto, from dynamicstudio GmbH in Poschiavo, Switzerland and I'm new to this forum. We just bought a RevPi connect+ and a DIO to build a small automation station up in the Bernina Pass.

Now, I've got a problem with the piControl module.
A couple of days ago I needed to recompile the kernel (taken from RevolutionPi/linux github) in order to include a custom driver for a touchscreen (Penmount 6000 usb). After compiling the kernel and putting it in to the /boot folder if I do
>> piTest -d
i got the following error "Cannot retrieve device list: No such device"

Now i checked the kernel versions with
>> uname -r
and the version was the same after putting my custom kernel
Of course doing
>> sudo apt install --reinstall raspberrypi-kernel
Solved the problem with piControl but doing that replaced the kernel in which I put the driver for the touchscreen and my touchscreen is no longer working.

Have you got any clue why piControl won't load when using my custom kernel and can I fix this?

Thanks,
Roberto

Dear Roberto, this may be the point where the device tree is missing something here. Have a look at the "revpi-factory-reset" tool. You have to configure the device tree according to your device, i.e. RevPi Core, RevPi Connect, etc.

dirk wrote: ↑19 Sep 2019, 07:06 Dear Roberto, this may be the point where the device tree is missing something here. Have a look at the "revpi-factory-reset" tool. You have to configure the device tree according to your device, i.e. RevPi Core, RevPi Connect, etc.

Hello, and thank you for your reply.

It seems that I can't find any info about revpi-factory-reset. Would you like to give me a link for a tutorial or guide ?

Also when compiling the kernel with my driver, after making the modules with
>> make modules_install
I got the following:
 DEPMOD  4.9.76-rt60-v7+
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol max3191x_get_status
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol preempt_count_add
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol _mutex_lock
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol preempt_schedule
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol preempt_count_sub
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol rt_read_lock
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol _mutex_unlock
depmod: WARNING: /lib/modules/4.9.76-rt60-v7+/extra/piControl.ko needs unknown symbol rt_read_unlock

Another question:
Maybe if something is missing from the kernel I built is because I didn't include it when configuring the build.

I issued the following:
>>KERNEL=kernel7
>>make bcm2709_defconfig
>> make menuconfig --> included my custom driver
>> sudo make -j4 zImage modules dtbs
>> sudo make modules_install

and then copied the entire thing with
>>sudo cp arch/arm/boot/dts/*.dtb /boot/
>>sudo cp arch/arm/boot/dts/overlays/*.dtb* /boot/overlays/
>>sudo cp arch/arm/boot/dts/overlays/README /boot/overlays/
>>sudo scripts/mkknlimg arch/arm/boot/zImage /boot/$KERNEL.img

Is bcm2709_defconfig the right configuration for my RevPi connect or what ?

Thanks,
Roberto

If you login and execute "which revpi-factory-reset" there you go.

Hello Roberto,

the bcm2709_defconfig is not the right configuration, you should also git clone RevolutionPi/kernelbakery (https://github.com/RevolutionPi/kernelbakery) and try to follow the instructions in README to build the kernel for Revolution Pi Connect.

Regards
Simon

Hello Simon,
thanks for the tip, I'll try the next week hoping it will work.

Regards,
Roberto

Hi Roberto,

you are welcome , and feel free to post here if you have further question about this.

Regrads,
Simon