[yocto] Kernel header generation

[Luo Zhenhua]

Hi Sarayu K S ,

To include the kernel source code in rootfs, you can add kernel-dev in IMAGE_INSTALL.


Best Regards,

Zhenhua

From: yocto-bounces at yoctoproject.org [mailto:yocto-bounces at yoctoproject.org] On Behalf Of Sarayu Krishna Sivanandam
Sent: Tuesday, December 01, 2015 1:40 PM
To: Khem Raj <raj.khem at gmail.com>
Cc: yocto at yoctoproject.org
Subject: Re: [yocto] Kernel header generation

Hi Khem .

Thanks for your response. But i am not sure if i understand clearly. My intention here is to generate kernel headers and i wanted to understand how to do the same .

Based on some online reference , I tried to add the lines ( IMAGE_INSTALL_append = " kernel-devsrc"
TOOLCHAIN_TARGET_TASK_append = " kernel-devsrc") in my image file but got some errors as shown below.
ERROR: Nothing RPROVIDES 'kernel-devsrc' (but /home/sarayu/freescale/v2.0/Freescale-Linux-SDK-for-LS1021A-Rev2-v0.4-20150803-yocto/meta-fsl-networking/images/fsl-image-core.bb<http://fsl-image-core.bb/> RDEPENDS on or otherwise requires it)
NOTE: Runtime target 'kernel-devsrc' is unbuildable, removing...
ERROR: Required build target 'fsl-image-core' has no buildable providers.


I understood that the kernel-devsrc.bb<http://kernel-devsrc.bb> is not present in my SDK and i tried to manually add it in the kernel-recipies by using the online link (https://github.com/01org/luv-yocto/blob/master/meta/recipes-kernel/linux/kernel-devsrc.bb) but looks like it has some additional dependencies as my build failed again with the below error.

ERROR: ExpansionError during parsing /home/sarayu/freescale/v2.0/Freescale-Linux-SDK-for-LS1021A-Rev2-v0.4-20150803-yocto/meta-fsl-networking/images/fsl-image-core.bb<http://fsl-image-core.bb/>: Failure expanding variable KERNEL_VERSION: ExpansionError: Failure expanding variable KERNEL_VERSION, expression was ${@get_kernelversion_headers('/home/sarayu/freescale/v2.0/Freescale-Linux-SDK-for-LS1021A-Rev2-v0.4-20150803-yocto/build_ls1021atwr_release/tmp/sysroots/ls1021atwr/usr/src/kernel')}<mailto:$%7b at get_kernelversion_headers('/home/sarayu/freescale/v2.0/Freescale-Linux-SDK-for-LS1021A-Rev2-v0.4-20150803-yocto/build_ls1021atwr_release/tmp/sysroots/ls1021atwr/usr/src/kernel')%7d> which triggered exception NameError: name 'get_kernelversion_headers' is not defined

My question is how can we generate kernel headers from yocto source . If you have any reference or sample for the same please do share it with me .

Thanks in advance for your help.


Thanks and Regards,
Sarayu K S
Tech Lead
Zaikenn Technologies

On Tue, Dec 1, 2015 at 1:29 AM, Khem Raj <raj.khem at gmail.com<mailto:raj.khem at gmail.com>> wrote:

On Nov 27, 2015 5:48 AM, "Sarayu Krishna Sivanandam" <sarayu at zaikenn.com<mailto:sarayu at zaikenn.com>> wrote:
>
> Hi ,
>
> I have written a kernel module which i am currently building along with the yocto kernel but i want to be able to move my code to a different repository and be able to build it as a stand alone module.
>
> To do so , i will need the kernel headers to be generated from the linux kernel on yocto . Can you please provide me the steps to build the kernel headers and be able to install it outside the yocto setup.

You need to look into building it as external module first. Thats totally between kbuild and your module build system. Once that is in place then you just write a new recipe for your module and inherit module class in it mainly doing the build and packaging from OE point. There already are many such recipes already in meta data
>
> I am using the QorIQ-SDK-V1.8 SDK .
>
> Thanks in advance for your help.
> Thanks and Regards,
> Sarayu K S
> Tech Lead
> Zaikenn Technologies
>
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