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

[Erick Oduniyi]

Hi Marov!

Thank you for the tip. I will try this ASAP.

Best
Erick

On Thu, Jul 8, 2021, 3:49 AM Marov Gazaal <adamagaghz at gmail.com> wrote:

> Hello Erick, I think Jushoa meant to re-enter to the .config of litmus-rt
> using "make menuconfig" command and set the I2C configurations. I searched
> for this inside .config file and I found the path below which may help you:
> "Device Drivers" then "I2C support" then " I2C Hardware support".
> Or:
> Device Drivers" then "Multifunction device drivers".
> I should to tell you I am not expert on this, but I used the first path
> once to appear the I2C ports, so I supposed it may help you.
>
> Regard,
> Marouf
> MSC student, Tishreen university.
>
>
> في الخميس، ٨ يوليو ٢٠٢١ ٦:٢٩ ص Erick Oduniyi <eeoduniyi at gmail.com> كتب:
>
>> Joshua!
>>
>> I am not sure where the kernel config file you're specifying is located
>> (I don't think you mean config.txt or the .config folder):
>> [image: Screen Shot 2021-07-07 at 9.51.45 PM (2).png]
>> Again, I followed this tutorial for installing LITMUS^RT on the Pi:
>> https://www.litmus-rt.org/doc/litmus-rt-on-raspbian.pdf, which I
>> originally thought I followed correctly but now not so much
>>
>> On Tue, Jul 6, 2021 at 8:01 PM Joshua Bakita <jbakita at cs.unc.edu> wrote:
>>
>>> 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
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>>>> litmus-dev at lists.litmus-rt.org
>>>> https://lists.litmus-rt.org/listinfo/litmus-dev
>>>>
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