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Registered: ‎10-19-2019

Petalinux, can't access devices

Hi, thank you for reading me

I've tried, like many I suppose, to create a custom driver. Just a basic one for learning purpose (I'm actually more a hardware than a software designer). Subject is about a driver that allows the use to control a bunch of leds.

 

I'm working with 2018.3 design tools

 

On the hardware I have a Axi GPIO IP, plus a zynq processor.

On the software I have a project builded with petalinux tools plus a driver that I've created using the default template provided when using the

petalinux-create -t module ... command

I modified the driver template and, of course my user device tree (see attached)

On the console everything looks okay to me, the kernel is probing for hardware and found my IP with the correct base physical address.

 

console_probe.png

 

 

Now, If we check in the /dev/ repository the device I created is there with the name of "my device"

 

dev.png

 

And same thing in the /sys/class, I have a class caled "myclass" with "mydevice" in it

 

class_.png

 

 

with a cat /proc/devices I finally check that the device has been registered as a character device

 

permissions.png

 

At that point it seems to me that everything is ok since so i tried the following command to test my driver,

echo '1' > /dev/mydevice

But this error message fire :

bug.png

 

Now, I do understand that this approach is definitly not the fastest one to get the job done (knwing that a UIO generic driver is embedded to control gpios) But I'd like to understand the entire process of making a driver.

Does anyone have a idea on this ?

Please, find attached my device tree and the custom driver I've made. Any comments would be appreciated

 

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