[LITMUS^RT] Errors when trying to detect I²C on Raspberry Pi

[Joshua Bakita]

Hello Erick,

I can't think of anything related to LITMUS^RT that could be causing
problems. The modprobe error seems to indicate that something isn't right
with your install of the kernel modules. One quick workaround is to just
build in the i2c-bcm2708 driver into your kernel rather than as a module.
To do this, open your kernel .config file, change CONFIG_I2C_BCM2708=m to
CONFIG_I2C_BCM2708=y, save, and repeat the following steps to rebuild and
install the kernel.

Best,

Joshua Bakita
PhD Student | Real-Time Systems | UNC Chapel Hill

On Sat, Jul 3, 2021 at 6:36 PM Erick Oduniyi <eeoduniyi at gmail.com> wrote:

> Dear All,
>
> I am trying to enable i2c on a Raspberry Pi 3 Model B+ running
> 4.9.80-v7-litmus+ so that I can move a hobby servo; however, I have not
> detected the i2c interfaces.
>
> I have enabled i2c through raspi-config and checked to see that the
> relevant lines within /boot/config.txt were uncommented. I have even tried
> to add the modules manually but still no progress:
>
> [image: Screen Shot 2021-07-03 at 4.34.14 PM.png]
>
> Using a non-Litmus Raspbian OS I can correctly detect and operate the
> servo:
> [image: Screen Shot 2021-07-03 at 3.41.15 PM.png]
>
> So, could something about the Litmus extension be blocking the i2c
> modules? If so, how should I go about getting the interface working again?
> Any guidance/help would be much appreciated!
>
> For reference, I used the guide:
> https://www.litmus-rt.org/doc/litmus-rt-on-raspbian.pdf
>
> Best,
> Erick
> _______________________________________________
> litmus-dev mailing list
> litmus-dev at lists.litmus-rt.org
> https://lists.litmus-rt.org/listinfo/litmus-dev
>
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