[yocto] Building out of tree module into kernel image

[Fan Zhang]

Hi Vincent

Thanks for the quick reply. The MACHINE_ESSENTIAL_EXTRA_RDEPENDS 
  instruction was put in the local.conf in my build folder.

After renaming axidma.bb to kernel-module-axidma.bb. The image build 
picked up this module. Thanks you so much.

There is this comments in the module sample bb file/
/

    /# The inherit of module.bbclass will automatically name module
    packages with/
    /# "kernel-module-" prefix as required by the oe-core build environment.
    /

leaded me to believe this is done automatically by bitbake. Thanks again.

Best regards,

Fan


/
/
//On 06/09/2017 11:00 AM, Vincent Prince wrote:
> Hi,
>
> Where did you put MACHINE_ESSENTIAL_EXTRA_RDEPENDS  instruction?
> Did you try to rename axidma.bb <http://axidma.bb/> to 
> kernel-module-axidma.bb <http://kernel-module-axidma.bb> ?
>
> Best Regards,
> Vincent
>
> 2017-09-06 16:13 GMT+02:00 Fan Zhang <fzhang at sgl.com 
> <mailto:fzhang at sgl.com>>:
>
>     Hi,
>
>     I've followed the Yocto manual here:
>     http://www.yoctoproject.org/docs/1.6.1/kernel-dev/kernel-dev.html#incorporating-out-of-tree-modules
>     <http://www.yoctoproject.org/docs/1.6.1/kernel-dev/kernel-dev.html#incorporating-out-of-tree-modules>
>     to include an out of tree module, named axidma. I can build this
>     module alone by
>
>     bitbake axidma
>
>     and get the .ko file in build/tmp/work/my_machine/axidma
>     directory, but when I build my custom image, and include this
>     module by
>
>     MACHINE_ESSENTIAL_EXTRA_RDEPENDS += "kernel-module-axidma"
>
>     I got an error that says "/Computing transaction...error: Can't
>     install packagegroup-core-boot-1.0-r17 at microzed_zynq7: no package
>     provides kernel-module-axidma/". All the other variables mentioned
>     in the manual doesn't compile the module either. They just doesn't
>     stop the image from building.
>
>     After googling for a few days, it seems every thread I found
>     stucked at different stage of this problem, some advance further
>     than me, but from my very limited knowledge about bitbake, out of
>     tree modules should be included into the build by module.bbclass,
>     which has do_configuration, do_compile and do _install in that
>     class. So it is quite puzzling why this is not working.
>
>     Any pointer is greatly appreciated. Thanks. Below are the
>     configurations for my module:
>
>         My axidma folder structure is this
>
>             /axidma (a directory under recipes-sgl directory)
>             /
>
>             /    - files (directory)
>             /
>
>             /            - COPYING/
>
>             /            - dma_proxy.c/
>
>             /            - dma_proxy.h/
>
>             /            - Makefile
>             /
>
>             /    - axidma.bb <http://axidma.bb>/
>
>         The bb files in axidma directory is added to BBFILES in
>         layer.conf by
>
>             /BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \//
>             //    ${LAYERDIR}/recipes-*/*/*.bbappend"/
>
>         axidma.bb <http://axidma.bb> file looks like this:
>
>             /SUMMARY = "Example of how to build an external Linux
>             kernel module"
>             LICENSE = "GPLv2"
>             LIC_FILES_CHKSUM =
>             "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e"
>
>             inherit module
>             PR = "r0"
>             PV = "0.1"
>             SRC_URI = "file://Makefile \
>             file://dma_proxy.c \
>             file://dma_proxy.h \
>             file://COPYING \
>                       "
>
>             S = "${WORKDIR}"
>
>             # The inherit of module.bbclass will automatically name
>             module packages with
>             # "kernel-module-" prefix as required by the oe-core build
>             environment./
>
>         Makefile looks like this:
>
>             /obj-m := dma_proxy.o//
>             //
>             //SRC := $(shell pwd)//
>             //
>             //all://
>             //    $(MAKE) -C $(KERNEL_SRC) M=$(SRC)//
>             //
>             //modules_install://
>             //    $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install//
>             //
>             //clean://
>             //    rm -f *.o *~ core .depend .*.cmd *.ko *.mod.c//
>             //    rm -f Module.markers Module.symvers modules.order//
>             //    rm -rf .tmp_versions Modules.symvers/
>
>     Fan Zhang
>
>
>
>     --
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