libcamera, DEBIX Model A, I/O Board, Raspberry Pi Camera 3 and 2.1 and Debix Ubuntu 22.04.5 LTS

Thu Jan 16 11:40:58 CET 2025

> Camera modules are not auto-detected by the kernel.

Thank you - I'd misunderstood that.

> You need to load DT
> overlays corresponding to the module you use. See [1] for an overlay
> that switches the ISP on, and [2] for an overlay that connects the RPi
> camera v2 (both based on v6.11, I need to rebase them on v6.12).

Thank you very much. Would it be better for me to wait until they're 
rebased?

> You don't need a newer Ubuntu version, but you will likely need a newer
> kernel as DT integration for the i.MX8MP ISP has been merged in v6.12
> only. I recommend compiling the kernel and device tree yourself.

Thank you very much, I haven't compiled the kernel myself or used DT 
overlays before so I'm not sure what to do. I think I should install 
dependencies then get the default Ubuntu .config file and build from 
there but I'm not sure and I'm not sure the most efficient way of 
loading the DT overlays (I don't want to do anything that may 
accidentally increase boot time).

Is it more sensible for me to compile the kernel locally on the i.MX8MP 
board with 2 GB RAM and leave it for as long as it takes or would it be 
more sensible for me to do this on a more powerful machine?

at the moment

uname -r #gives 6.1.22 which seems a very old kernel given the pace of 
libcamera development

I tried Debix's Ubuntu and Yocto distributions because i thought they 
might have Debix BSPs but maybe I'd be better to start with a more 
generic distribution?

Will

On 2025-01-16 08:29, Laurent Pinchart wrote:
> On Thu, Jan 16, 2025 at 12:07:13AM +0000, w.robertson at cairnwater.com 
> wrote:
>> I'm sorry to bother folk.
>> 
>> I got a DEBIX Model A with 2 GB of RAM, a DEBIX Model A I/O Board and 
>> a
>> Raspberry Pi Camera Module 3
>> 
>> I followed the instructions for connecting the board and used the Add 
>> On
>> board app to select the IO Board.
>> 
>> I tried installing dependencies using the instructions at
>> https://libcamera.org/getting-started.html then getting the latest
>> libcamera source and compiling but when I run
>> 
>> cam -l
>> 
>> I just get
>> 
>> Available cameras:
>> 
>> and nothing else.
>> 
>> I tried a Raspberry Pi Camera v2.1 but with the same result.
> 
> Camera modules are not auto-detected by the kernel. You need to load DT
> overlays corresponding to the module you use. See [1] for an overlay
> that switches the ISP on, and [2] for an overlay that connects the RPi
> camera v2 (both based on v6.11, I need to rebase them on v6.12).
> 
> [1] 
> https://gitlab.com/ideasonboard/nxp/linux/-/commit/284144b1bb159b0933862dae8d67a0dcdf7462c7
> [2] 
> https://gitlab.com/ideasonboard/nxp/linux/-/commit/200a14f20a2f9e2d1fd2a9eb9df397a05ee0b131
> 
>> I also tried without compiling
>> 
>> sudo apt-get -y install libcamera-dev
>> 
>> and got the same result.
>> 
>> I can't work out what's wrong except that I downloaded Ubuntu from the
>> Debix download page and that's given me Ubuntu 22.04.5 LTS - which is
>> maybe too old for the latest version of libcamera?
>> 
>> Would it be better if i use a newer version of Ubuntu and configure 
>> the
>> machine to use the I/O Board manually?
> 
> You don't need a newer Ubuntu version, but you will likely need a newer
> kernel as DT integration for the i.MX8MP ISP has been merged in v6.12
> only. I recommend compiling the kernel and device tree yourself.
> 
>> Here's the complete output:
>> 
>> debix at imx8mp-debix:~$ LIBCAMERA_LOG_LEVELS=*:DEBUG cam -l
>> [0:13:10.535280467] [3746] DEBUG IPAModule ipa_module.cpp:333
>> ipa_mali_c55.so: IPA module
>> /usr/local/lib/aarch64-linux-gnu/libcamera/ipa_mali_c55.so is signed
>> [0:13:10.535776365] [3746] DEBUG IPAManager ipa_manager.cpp:235 Loaded
>> IPA module 
>> '/usr/local/lib/aarch64-linux-gnu/libcamera/ipa_mali_c55.so'
>> [0:13:10.537995216] [3746] DEBUG IPAModule ipa_module.cpp:333
>> ipa_rkisp1.so: IPA module
>> /usr/local/lib/aarch64-linux-gnu/libcamera/ipa_rkisp1.so is signed
>> [0:13:10.538297480] [3746] DEBUG IPAManager ipa_manager.cpp:235 Loaded
>> IPA module '/usr/local/lib/aarch64-linux-gnu/libcamera/ipa_rkisp1.so'
>> [0:13:10.539061515] [3746] DEBUG IPAModule ipa_module.cpp:333
>> ipa_rpi_vc4.so: IPA module
>> /usr/local/lib/aarch64-linux-gnu/libcamera/ipa_rpi_vc4.so is signed
>> [0:13:10.539287651] [3746] DEBUG IPAManager ipa_manager.cpp:235 Loaded
>> IPA module '/usr/local/lib/aarch64-linux-gnu/libcamera/ipa_rpi_vc4.so'
>> [0:13:10.539707295] [3746] DEBUG IPAModule ipa_module.cpp:333
>> ipa_soft_simple.so: IPA module
>> /usr/local/lib/aarch64-linux-gnu/libcamera/ipa_soft_simple.so is 
>> signed
>> [0:13:10.539882178] [3746] DEBUG IPAManager ipa_manager.cpp:235 Loaded
>> IPA module
>> '/usr/local/lib/aarch64-linux-gnu/libcamera/ipa_soft_simple.so'
>> [0:13:10.540169816] [3746]  INFO Camera camera_manager.cpp:327 
>> libcamera
>> v0.4.0+30-4dad8ece
>> [0:13:10.540818221] [3750] DEBUG Camera camera_manager.cpp:73 Starting
>> camera manager
>> [0:13:10.545999958] [3750] DEBUG DeviceEnumerator
>> device_enumerator.cpp:230 New media device "mxc-md" created from
>> /dev/media0
>> [0:13:10.546918125] [3750] DEBUG DeviceEnumerator
>> device_enumerator.cpp:258 Added device /dev/media0: mxc-md
>> [0:13:10.548034551] [3750] DEBUG DeviceEnumerator
>> device_enumerator.cpp:230 New media device "vvcam-video" created from
>> /dev/media1
>> [0:13:10.548945718] [3750] DEBUG DeviceEnumerator
>> device_enumerator_udev.cpp:96 Defer media device /dev/media1 due to 1
>> missing dependencies
>> [0:13:10.550379658] [3750] DEBUG DeviceEnumerator
>> device_enumerator_udev.cpp:322 All dependencies for media device
>> /dev/media1 found
>> [0:13:10.550503164] [3750] DEBUG DeviceEnumerator
>> device_enumerator.cpp:258 Added device /dev/media1: vvcam-video
>> [0:13:10.551861226] [3750] DEBUG Camera camera_manager.cpp:140 Found
>> registered pipeline handler 'imx8-isi'
>> [0:13:10.553136660] [3750] DEBUG Camera camera_manager.cpp:140 Found
>> registered pipeline handler 'mali-c55'
>> [0:13:10.553631807] [3750] DEBUG Camera camera_manager.cpp:140 Found
>> registered pipeline handler 'rkisp1'
>> [0:13:10.554004824] [3750] DEBUG Camera camera_manager.cpp:140 Found
>> registered pipeline handler 'rpi/vc4'
>> [0:13:10.554180208] [3750] DEBUG RPI vc4.cpp:179 Unable to acquire a
>> Unicam instance
>> [0:13:10.554230835] [3750] DEBUG RPI vc4.cpp:179 Unable to acquire a
>> Unicam instance
>> [0:13:10.554286837] [3750] DEBUG Camera camera_manager.cpp:140 Found
>> registered pipeline handler 'simple'
>> [0:13:10.554453720] [3750] DEBUG Camera camera_manager.cpp:140 Found
>> registered pipeline handler 'uvcvideo'
>> Available cameras:
>> debix at imx8mp-debix:~$