[yocto] Proper Use of KERNEL_MODULE_AUTOLOAD variable

[Khem Raj]

On Sat, Feb 2, 2019 at 7:17 PM Ken Sloat <ken.sloat at ohmlinxelectronics.com>
wrote:

> On Sat, Feb 2, 2019 at 10:03 PM Bruce Ashfield
> <bruce.ashfield at windriver.com> wrote:
> >
> > On 2019-02-02 9:59 p.m., Ken Sloat wrote:
> > > Hello,
> > >
> > > I have an out of tree kernel module which I want autoloaded at startup
> > > on my system. Looking at the Yocto project manual, I see that one way
> > > I can do this is to add the module name to the KERNEL_MODULE_AUTOLOAD
> > > variable within my custom module recipe.
> > >
> > > What I have found is that the module-split class is indeed generating
> > > the "/etc/modules-load.d/mymodule.conf" file, however this file is not
> > > actually being installed. To be more precise it is appearing in the
> > > "package" directory (i.e.
> > > tmp/work/**/mymodule/package/etc/modules-load.d/mymodule.conf) but not
> > > within the "image" directory (nor in my final rootfs).
> > >
> > > Is there something I'm missing in the usage of KERNEL_MODULE_AUTOLOAD?
> > > Is the intention for this variable I add extra steps to manually
> > > install this file in my recipe? FYI I'm using Morty.
> >
> > Can you provide your recipe ? It would make suggestions easier. For
> > example, my first question is: Is the module being installed to your
> > image via IMAGE_INSTALL, or some other similar variable ?
> >
> > Bruce
> >
> > >
> > > Thanks,
> > > Ken Sloat
> > >
> >
>
> Hi Bruce,
>
> Thanks for your quick reply. Yes the module is being installed via
> image_install. Module is installed but generated conf file is not. See
> recipe below:
>
> require mymodule.inc
>
> inherit module kernel-module-split
>
> DEPENDS = "virtual/kernel"
>
> EXTRA_OEMAKE_append = " \
>     KERNELDIR=${STAGING_KERNEL_DIR} \
>     "
>
> MAKE_TARGETS = "module"
>
> MODULE_NAME = "mymodule"
>
> PKG_${PN} = "kernel-module-${MODULE_NAME}"
>
> module_do_install() {
>     install -d ${D}/lib/modules/${KERNEL_VERSION}/kernel/${MODULE_NAME}
>     install -m 0644 ${MODULE_NAME}.ko \
>
> ${D}/lib/modules/${KERNEL_VERSION}/kernel/${MODULE_NAME}/${MODULE_NAME}.ko
> }
>
> FILES_${PN} = " \
>     /lib/modules/${KERNEL_VERSION}/kernel/${MODULE_NAME} \
> "


Your recipe is overwriting common stuff which otherwise should be provided
by module bbclass
I would suggest that you append to the variables instead of over writing
them above and try to reuse
The primitives from bbclass as much as you can for best results

>
>
> KERNEL_MODULE_AUTOLOAD += "${MODULE_NAME}"
> --
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