Need help in enable configuration when compile Kernel module

[m silverstri]

And please help me udnerstand what is the difference between 'y' and
'm' in  'CONFIG_VIDEOBUF2_CORE=y instead of CONFIG_VIDEOBUF2_CORE=m'?

On Thu, Jan 9, 2014 at 10:23 PM, m silverstri
<michael.j.silverstri at gmail.com> wrote:
> Thanks. Can you please help me understand what you mean by 'make this
> to build into kernel instead of static'?
>
>
> On Thu, Jan 9, 2014 at 7:18 PM, Ashokkumar G
> <ashok.sysprogrammer at gmail.com> wrote:
>> Dear Silverstri,
>>
>> I am not sure for which platform you are compiling Kernel.
>>
>> But for X86(_64) and ARM, CONFIG_VIDEOBUF2_CORE will be selected as a module
>> (will not build into kernel image static), this is the dependency
>> VIDEOBUF2_DMA_CONTIG [=m] && MEDIA_SUPPORT [=m] && HAS_DMA [=y] ||
>> VIDEOBUF2_VMALLOC [=m] && MEDIA_SUPPORT [=m] || VIDEOBUF2_DMA_SG [=n] &&
>> MEDIA_SUPPORT [=m] || SOC_CAMERA [=m] && MEDIA_SUPPORT [=m] &&
>> V4L_PLATFORM_DRIVERS [=y] && VIDEO_V4L2 [=m] && HAS_DMA [=y] && I2C [=y].
>>
>> select MEDIA_SUPPORT and SOC_CAMERA to build into kernel image static (when
>> you select one of MEDIA_SUPPORT/SOC_CAMERA/VIDEO_V4L2 as build static into
>> kernel, .config will have  CONFIG_VIDEOBUF2_CORE=y instead of
>> CONFIG_VIDEOBUF2_CORE=m)
>>
>> For ARM board I used Device Drivers->Multimedia Support (make this to build
>> into kernel instead of static)->V4L platform devices (make this to build
>> into kernel instead of static)->Soc Camera Support(make this to build into
>> kernel instead of static).
>>
>> --
>> Best Regards
>> Ashokkumar.G
>> 100 Things can not be taken back. 001. A lost opportunity. 010. A spoken
>> word. 011. A sped arrow. 100. Time spent.
>>
>>
>> On Thu, Jan 9, 2014 at 7:16 PM, m silverstri
>> <michael.j.silverstri at gmail.com> wrote:
>>>
>>> I am using 3.10.x kernel tree. My kernel module needs config VIDEOBUF2.
>>>
>>> That is defined in drivers/media/v4l2-core/Kconfig:
>>>
>>> # Used by drivers that need Videobuf2 modules
>>> config VIDEOBUF2_CORE
>>> select DMA_SHARED_BUFFER
>>> tristate
>>>
>>> So I put 'CONFIG_VIDEOBUF2_CORE=y' in my Kernel config file and
>>> compile. From the Kconfig it has CONFIG_VIDEOBUF2_CORE has no
>>> dependency and I think adding CONFIG_VIDEOBUF2_CORE=y to my kernel
>>> config should work. I am modify the right kernel config file since I
>>> set other flags like CONFIG_VIDEO_DEV=y and that works.
>>>
>>> The generated .config does not contain 'CONFIG_VIDEOBUF2_CORE=y'
>>>
>>> and the compilation fails with  a bunch of
>>>
>>> undefined reference to `vb2_buffer_done'
>>> undefined reference to `vb2_buffer_done'
>>> undefined reference to `vb2_buffer_done'
>>> undefined reference to `vb2_buffer_done'
>>>
>>> I really appreciate if someone can help me with this.
>>>
>>> Thank you.
>>>
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>>> Kernelnewbies mailing list
>>> Kernelnewbies at kernelnewbies.org
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>>
>>