[yocto] Building out of tree module into kernel image

[Vincent Prince]

Hi,

Where did you put MACHINE_ESSENTIAL_EXTRA_RDEPENDS  instruction?
Did you try to rename axidma.bb to kernel-module-axidma.bb ?

Best Regards,
Vincent

2017-09-06 16:13 GMT+02:00 Fan Zhang <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
> 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 \*
> *    ${LAYERDIR}/recipes-*/*/*.bbappend"*
>
> axidma.bb file looks like this:
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> *SUMMARY = "Example of how to build an external Linux kernel module"
> LICENSE = "GPLv2" LIC_FILES_CHKSUM =
> "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e" inherit module PR =
> "r0" PV = "0.1" SRC_URI = "file://Makefile \            file://dma_proxy.c
> \            file://dma_proxy.h \            file://COPYING \           " S
> = "${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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>
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