[yocto] How to build a simple kernel modul

[Esponde, Joel]

Hi,

And here is a hello world module example:
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta-skeleton/recipes-kernel/hello-mod

Joël Esponde
Honeywell | Sensing and Productivity Solutions

De : yocto-bounces at yoctoproject.org [mailto:yocto-bounces at yoctoproject.org] De la part de Petter Mabäcker
Envoyé : mardi 10 mai 2016 06:51
À : yocto at yoctoproject.org
Objet : Re: [yocto] How to build a simple kernel modul


2016-05-09 17:06 skrev S.Jaritz at esa-grimma.de<mailto:S.Jaritz at esa-grimma.de>:
Hej,

I want to build a recipe for a simple GPIO Module. I found no tutorial at the documentation. What is the comon way to build a simple kernel module?

The Makefile looks like:
#########
obj-m += ledmodule.o

SRC := $(shell pwd)

all: modules

modules:
        $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules

modules_install:
        $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install

clean:
        rm -rf *.o *.ko *.mod.c
#########
The recipe contains:
#########
SUMMARY = "ledmodule"
SECTION = ""
LICENSE = "CLOSED"

inherit module

SRC_URI = "file://ledmodule.c<file:///\\sek4_ledmodule.c\> \
        file://Makefile<file:///\\Makefile\> \
        "
S = "${WORKDIR}/ledmodule-0.1"
#########

Regards

Stefan Jaritz
Entwickler

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Hi,

There are actually some guides for this, see lab4 in:
https://www.yoctoproject.org/sites/default/files/kernel-lab-2.1_0.pdf

But to simply build a module using bitbake, you can just do:

$ bitbake ledmodule

then you will find your recipe and the module in the ./tmp/work/ structure (assuming you are not inheriting 'rm_work' in local.conf...).



if you just want to compile it, you can run:

$ bitbake ledmodule -c compile



BR Petter

Petter Mabäcker



Technux <petter at technux.se<mailto:petter at technux.se>>

www.technux.se<http://www.technux.se>
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