Out-of-tree kernel module is unbuildable

Out-of-tree kernel module is unbuildable

[Clay D. Montgomery]

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Hello,

    I'm trying to add an external kernel module to my layer by following 
this guide in the Yocto Kernel Development Manual and using the 
recommended template:


      2.10.2. Incorporating Out-of-Tree
      Modules<https://www.yoctoproject.org/docs/current/kernel-dev/kernel-dev.html#incorporating-out-of-tree-modules>

     poky/meta-skeleton/recipes-kernel/hello-mod/hello-mod_0.1.bb


However, bitbake always reports that my "Runtime target 
'lightwing-camera' is unbuildable, removing..."
I would appreciate if someone could help me isolate this problem.
This is my new recipe for the module:

SUMMARY = "External kernel module for OV5645 MIPI camera"
LICENSE = "GPLv2"
LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e"

inherit module

SRC_URI = "file://Makefile \
            file://ov5645_mipi.c \
            file://COPYING \
           "

S = "${WORKDIR}"

RPROVIDES_lightwing-camera = "lightwing-camera"



And this is my makefile:



obj-m := ov5645_mipi.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


Thank you, Clay Montgomery

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How to debug unbuildable module error?

[Clay D. Montgomery]

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Is there a way to get bitbake to provide more information about why a 
module is unbuildable?

I am trying to build this example:

  poky/meta-skeleton/recipes-kernel/hello-mod/hello-mod_0.1.bb

However, bitbake always reports:

  "Runtime target 'hello-mod' is unbuildable, removing..."

The makefile and source file are trivial with no dependencies and the -v 
verbose option adds no information at all.

Thanks, Clay





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x-mozilla-html:TRUE
url:http://montgomery1.com/contact/
version:2.1
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Re: How to debug unbuildable module error?

[Paul Eggleton]

Hi Clay

Somewhat late, but I stumbled across this this morning

On Monday, 16 July 2018 9:29:07 AM NZST Clay D. Montgomery wrote:
> 
> Is there a way to get bitbake to provide more information about why a 
> module is unbuildable?
> 
> I am trying to build this example:
> 
>   poky/meta-skeleton/recipes-kernel/hello-mod/hello-mod_0.1.bb
> 
> However, bitbake always reports:
> 
>   "Runtime target 'hello-mod' is unbuildable, removing..."

The actual issue will be printed above this message. Usually it's because the 
recipe depends upon something else that could not be built (and the reason for 
that will be in the message above).

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre