[yocto] Antwort: Re: How to build a simple kernel modul

Tue May 10 07:17:14 PDT 2016

Thanks so far!

I have 3 questions for my understanding:

1.) How to define extra Include Paths if the module needs some extra 
Includes?
        Like the "mach/gpio.h", which should be under 
"<Kernel-Dir>/arch/arm/mach-at91/include" and is needed for the PIN 
definitions.
        Should it be done at the Makefile like:
                CFLAGS_hello.o +=  -I${COMPILER_INCLUDE} 
-I${KERNEL_DIR}/arch/arm/mach-at91/include
        1.1) What are the equivalents to ${COMPILER_INCLUDE} and 
${KERNEL_DIR} in Yocto?
        1.2) Should it be done in the Makefile or at the bb-File?
2.) How to activate/deactivate the Driver in the "local.conf"?
3.) How does the process works with cmake?
        3.1) Is it enough to inherit after modul cmake?
        like @ hello-mod_0.1.bb -> "inherit module cmake"

With kind regards!

Stefan Jaritz
Entwickler

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Von:    "Esponde, Joel" <Joel.Esponde at Honeywell.com>
An:     "petter at technux.se" <petter at technux.se>, "yocto at yoctoproject.org" 
<yocto at yoctoproject.org>
Datum:  10.05.2016 12:30
Betreff:        Re: [yocto] How to build a simple kernel modul
Gesendet von:   yocto-bounces at yoctoproject.org

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:
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://Makefile \ 
        " 
S = "${WORKDIR}/ledmodule-0.1" 
######### 

Regards

Stefan Jaritz
Entwickler

------------------------------------------------------------
ESA Elektroschaltanlagen Grimma GmbH
Broner Ring 30
04668 Grimma
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Jörg Reinker

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Steuernummer: 238/108/00755

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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>
www.technux.se-- 
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