[Buildroot] Question Linux-Module infrastructure

[Buildroot] Question Linux-Module infrastructure

[Jacques Samoun]

Hello,

I am using external tree build in my project. Trying to add a linux kernel
driver that i am developing.
My problem is that, the sources of my driver are not flat but arranged, for
various reasons in the following manner:
<mydriver>
               <some files>
               <top makefile>
              +--- inc
                   <shared includes>
              +--- user
                     <files>
                      <Makefile>
              +--- kernel
                       <files>
                       <Makefile>

My hal.mk is  (hal is the name of the package)

HAL_VERSION = 1.0.0
HAL_SITE =  ../top/source/hal
HAL_SITE_METHOD = local

$(eval $(kernel-module))
$(eval $(generic-package))

My problem is that, with the HAL_SITE above, everything is rsync'ed
correctly in the br/output dir, but the driver (*in the kernel subdir*)
fails to compile.
On the other hand, if HAL_SITE =  ../top/source/hal/kernel

then obviously only a part of the files would be rsync'ed and the shared
inlcude files will be missing (|for example) .... but the kernel driver
will be build (and eventually fails because of the shared include files)

What am I missing ? this must be a small detail that i am completely
overlooking ...

Thanks,
Jacques
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[Buildroot] Question Linux-Module infrastructure

[Jacques Samoun]

Hello,

I am using external tree build in my project. Trying to add a linux kernel
driver that i am developing.
My problem is that, the sources of my driver are not flat but arranged, for
various reasons in the following manner:
<mydriver>
               <some files>
               <top makefile>
              +--- inc
                   <shared includes>
              +--- user
                     <files>
                      <Makefile>
              +--- kernel
                       <files>
                       <Makefile>

My hal.mk is  (hal is the name of the package)

HAL_VERSION = 1.0.0
HAL_SITE =  ../top/source/hal
HAL_SITE_METHOD = local

$(eval $(kernel-module))
$(eval $(generic-package))

My problem is that, with the HAL_SITE above, everything is rsync'ed
correctly in the br/output dir, but the driver (*in the kernel subdir*)
fails to compile.
On the other hand, if HAL_SITE =  ../top/source/hal/kernel

then obviously only a part of the files would be rsync'ed and the shared
inlcude files will be missing (|for example) .... but the kernel driver
will be build (and eventually fails because of the shared include files)

What am I missing ? this must be a small detail that i am completely
overlooking ...

Thanks,
Jacques
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[Buildroot] Question Linux-Module infrastructure

[Andreas Ziegler]

Hi Jacques,

On 2021-07-19 21:53, Jacques Samoun <jacques.samoun33@gmail.com> wrote:

> Hello,
> 
> I am using external tree build in my project. Trying to add a linux 
> kernel
> driver that i am developing.
> My problem is that, the sources of my driver are not flat but arranged, 
> for
> various reasons in the following manner:
> <mydriver>
>                <some files>
>                <top makefile>
>               +--- inc
>                    <shared includes>
>               +--- user
>                      <files>
>                       <Makefile>
>               +--- kernel
>                        <files>
>                        <Makefile>
> 
> My hal.mk is  (hal is the name of the package)
> 
> HAL_VERSION = 1.0.0
> HAL_SITE =  ../top/source/hal
> HAL_SITE_METHOD = local

You probably just need a statement to point the kernel build to the 
correct subdirectory:

HAL_MODULE_SUBDIRS = kernel

Kind regards,
Andreas