[yocto] Solved - Antwort: RE: how to install a kernel module

Fri May 13 04:36:42 PDT 2016

Great news !

BTW, I am surprised about this result… IMAGE_INSTALL_append works for me…
And the link you provided tells that _append method is preferred to +=…

Joël Esponde
Honeywell | Sensing and Productivity Solutions

De : S.Jaritz at esa-grimma.de [mailto:S.Jaritz at esa-grimma.de]
Envoyé : vendredi 13 mai 2016 13:18
À : Esponde, Joel; k4230r6 at gmail.com; yocto at yoctoproject.org
Objet : Solved - Antwort: RE: [yocto] how to install a kernel module

I solved that problem

Using

IMAGE_INSTALL += "ledmodule"

instead of

IMAGE_INSTALL_append = " ledmodule"

caused that the module was installed.

I found the hint in

https://communities.intel.com/thread/56810?start=0&tstart=0

Thanks for the help. Maybe a tip in the recipe template "hello_mod" could help other people trying to build theire own modules.

Stefan Jaritz

------------------------------------------------------------
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Von:        Stefan Jaritz/User/ESA-Grimma/DE
An:        "Esponde, Joel" <Joel.Esponde at Honeywell.com<mailto:Joel.Esponde at Honeywell.com>>, Christian Ege <k4230r6 at gmail.com<mailto:k4230r6 at gmail.com>>
Kopie:        "yocto at yoctoproject.org<mailto:yocto at yoctoproject.org>" <yocto at yoctoproject.org<mailto:yocto at yoctoproject.org>>
Datum:        13.05.2016 11:53
Betreff:        Antwort: RE: [yocto] how to install a kernel module
________________________________

Thanks for taking the time to help me

I tried your approach but it does not worked.

I tell what I figured out so far:

I.) checking the target system
1.) When flashing the images into my device and boot the system, the driver is not loaded.
2.) lsmod shows that there is no driver loaded
3.) modprobe tells me that there is no 'lib/modules' dir

II.) checking yocto
1.) Bitbake creates a package for my machine ("sama5d3xek") -> there are several packages; all are empty except the one with the "kernel-module-" prefix
2.) checking the "deploy/images" dir -> the module is not listed at the "*.manifest" file
3.) checking the "modules-*.tgz" file -> modules are in(like the ext4.ko) but not the ledmodule.ko

As far as I understand yocto and the meta-atmel layer there are "two" images build. One is the kernel and it goes under the "work/sama5d3xek..." dir. The other one is the rootfs and it goes under the "work/cortexahf..." dir. By using the module class for my ledmodule recipe yocto is generating it in the kernel dir.
I think I need to tell yocto in some way that it should include the module in the kernel(where the bb is placed) or at the rootfs (where the recipe is missing).
For me it seems that I have to rewrite my recipe. I delete the module class reference and adjust the install path to /lib/modules.
But it looks for me more as an workaround, because adding a own driver/module seems a common task which should be supported my yocto. I like to know the common way how to do it.

When checking the kernel package for the module the path for it is "/lib/modules/4.1.0_linux4sam.../extra/ledmodule.ko". The dir "/lib/modules/4.1.0_linux4sam.../" not exits at my target.

Regards!

Stefan Jaritz

------------------------------------------------------------
ESA Elektroschaltanlagen Grimma GmbH
Broner Ring 30
04668 Grimma
Telefon: +49 3437 9211 176
Telefax: +49 3437 9211 26
E-Mail: s.jaritz at esa-grimma.de<mailto:s.jaritz at esa-grimma.de>
Internet: www.esa-grimma.de

Geschäftsführer:
Dipl.-Ing. Jörg Gaitzsch
Jörg Reinker

Sitz der Gesellschaft: Grimma
Ust.-ID: DE 141784437
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Steuernummer: 238/108/00755

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Von:        "Esponde, Joel" <Joel.Esponde at Honeywell.com<mailto:Joel.Esponde at Honeywell.com>>
An:        "S.Jaritz at esa-grimma.de<mailto:S.Jaritz at esa-grimma.de>" <S.Jaritz at esa-grimma.de<mailto:S.Jaritz at esa-grimma.de>>, "yocto at yoctoproject.org<mailto:yocto at yoctoproject.org>" <yocto at yoctoproject.org<mailto:yocto at yoctoproject.org>>
Datum:        13.05.2016 11:15
Betreff:        RE: [yocto] how to install a kernel module
________________________________

Hi,

FYI, image recipes are in recipes-core/images folders.
So if you created your own image recipe, my previous mail should answer your need.

Otherwise, I don’t know if you could just add this line to your local.conf file…

IMAGE_INSTALL_append = " ledmodule"

The best way to know that your IMAGE_INSTALL variable is correctly set is to call this bitbake command:

$ bitbake <image> -e

Bitbake will output all the build environment variables and functions related to your image recipe.
So you will be able to check with this command that IMAGE_INSTALL has effectively your module name added to the list.

bitbake -e is a very important command when working with Yocto.

Regards,

Joël Esponde
Honeywell | Sensing and Productivity Solutions

De : yocto-bounces at yoctoproject.org<mailto:yocto-bounces at yoctoproject.org> [mailto:yocto-bounces at yoctoproject.org] De la part de S.Jaritz at esa-grimma.de<mailto:S.Jaritz at esa-grimma.de>
Envoyé : jeudi 12 mai 2016 16:32
À : yocto at yoctoproject.org<mailto:yocto at yoctoproject.org>
Objet : [yocto] how to install a kernel module

Hej

I created a recipe for a own modul. It's similar to the example given at:

http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta-skeleton/recipes-kernel/hello-mod

I checked the bitbake process. A "kernel-module-<module name>" package is created and filled with the ko-file.

Actually I am failing to bring the module into my image and run it. Are there a special command for the "local.conf" or so?

How and where to include the module?

Regards!

Stefan Jaritz

------------------------------------------------------------
ESA Elektroschaltanlagen Grimma GmbH
Broner Ring 30
04668 Grimma
Telefon: +49 3437 9211 176
Telefax: +49 3437 9211 26
E-Mail: s.jaritz at esa-grimma.de<mailto:s.jaritz at esa-grimma.de>
Internet: www.esa-grimma.de

Geschäftsführer:
Dipl.-Ing. Jörg Gaitzsch
Jörg Reinker

Sitz der Gesellschaft: Grimma
Ust.-ID: DE 141784437
Amtsgericht: Leipzig, HRB 5159
Steuernummer: 238/108/00755

Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen.
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