Hi I am trying to add a device which is '/dev/gpiomem' in Fedora IOT 37 aarch64. But I can only see '/dev/gpiochip0' and '/dev/gpiochip1' how can I add gpiomem device because the software I am installing is using this device in their code.
or how can I use '/dev/gpiochip0' or '/dev/gpiochip1' in c language.
Thank you

You need to be building a kernel with the bcm2835-gpiomem driver, and the relevant device tree entry.
I suspect Fedora uses the mainline Linux kernel, and neither of those can be upstreamed as they are viewed as a security issue.

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naumanramzan wrote: ↑

Sun Jul 16, 2023 1:55 pm

Hi I am trying to add a device which is '/dev/gpiomem' in Fedora IOT 37 aarch64. But I can only see '/dev/gpiochip0' and '/dev/gpiochip1' how can I add gpiomem device because the software I am installing is using this device in their code.
or how can I use '/dev/gpiochip0' or '/dev/gpiochip1' in c language.
Thank you

suggest you use raspberry os, fedora is fairly crippled on pi devices.

6by9 wrote: ↑

Sun Jul 16, 2023 2:10 pm

You need to be building a kernel with the bcm2835-gpiomem driver, and the relevant device tree entry.
I suspect Fedora uses the mainline Linux kernel, and neither of those can be upstreamed as they are viewed as a security issue.

@6by9 I am completely new to build linux kernel, can you please give me more details about this. Thank you in advance :)

Last edited by naumanramzan on Mon Jul 17, 2023 6:26 am, edited 1 time in total.

naumanramzan wrote: ↑

Mon Jul 17, 2023 6:10 am

6by9 wrote: ↑

Sun Jul 16, 2023 2:10 pm

You need to be building a kernel with the bcm2835-gpiomem driver, and the relevant device tree entry.
I suspect Fedora uses the mainline Linux kernel, and neither of those can be upstreamed as they are viewed as a security issue.

@6by9 I am completely new to build linux kernel, can you please give me more details about this. Thank you in advance :)

I am just a volunteer helper in these forums and don't speak for or on behalf of Raspberry Pi Ltd.

But it is clear that the user whose input you are requesting IS closely affiliated with Raspberry Pi, and is almost certainly a developer working on their own debian-linux-based Operating System, RasPiOS. So perhaps it is inappropriate to be asking for their detailed help to support your use of a third-party alternative.

The documentation that Raspberry Pi have supplied about the Linux Kernel might have some advice that can be applied to your situation? https://www.raspberrypi.com/documentati ... ernel.html

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