[yocto] Porting of specific Kernel/Driver into yocto.

[Bruce Ashfield]

On 12-04-11 11:34 AM, Om Prakash PAL wrote:
> Hi Bruce,
> 	I need some more info
>
> [1].I want to add kernel dir path into SRC_URI(in meta-<bsp_name>/recipe-kernel/linux/linux_3.0.bb), how can we add it ? i.e. lets imagine that my kernel is located in dir /local/kernel/*
> How we can add this kernel into SRC_URI?.(imagine that we don't have git:// and http: path, we have just dir where my kernel is located)

I do it this way in meta-kernel-dev:

http://git.yoctoproject.org/cgit/cgit.cgi/poky-extras/plain/meta-kernel-dev/recipes-kernel/linux/linux-yocto-dev.bbappend

In particular the protocol=file should be noticed.

>
> [2] we want to create BSP for our board that is based on arm-cortex-A9 but we don't have meta/conf/machine/include/tune-armcortexa9.inc file in current yocto.
> How can we create it?.

Answered this one previously.

Cheers,

Bruce

>
> Thanks,
>
> Best Regards,
> Om Prakash Pal
>
> -----Original Message-----
> From: Bruce Ashfield [mailto:bruce.ashfield at gmail.com]
> Sent: Monday, April 09, 2012 11:04 PM
> To: Om Prakash PAL
> Cc: yocto at yoctoproject.org
> Subject: Re: [yocto] Porting of specific Kernel/Driver into yocto.
>
> On Mon, Apr 9, 2012 at 12:31 PM, Om Prakash PAL
> <omprakash.pal at stericsson.com>  wrote:
>> Hi Bruce,
>> Thanks for you help.
>> As you have mentioned, its working properly.
>> I want to know that is there any better way of doing same thing for my scenario ?:
>> here is my scenario:
>> We have development branch where we write/modify our kernel/driver code i.e. thats our local kernel repository(git rep)
>> and lots of driver/files being modified everyday-->so I have to take the same effect into yocto kernel also---->  so except  creating patches for all modified drivers and creating .bbappend files, is there any better way of doing same thing .
>
> Aha. Missed that.
>
> Just create a simple recipe that points at your git repository in the SRC_URI.
> If all the changes are in the tree, and you have a defconfig and you
> are building
> the master branch. Then pretty much everything you need can be specified in
> the SRC_URI .. and that's the entire recipe.
>
> If you look in oe-classic, meta-ti or any one of a number of other
> layers, you'll
> find recipes that do just that.
>
> The meta-kernel-dev (in the poky extras) layer has an example of using the
> kernel.org tree with the yocto kern tools, and once yocto 1.3 opens up for
> submissions, I have a set of changes prep'd that make it relatively simple to
> use the yocto kern tools against different types of repository.
>
> So the summary is: Depending on the type of tooling you need, and what baseline
> you need for your work .. there are a number of ways to do things.
>
>>
>> Is there anyway that  instead of using yocto-kernel tree,  can we use our local kernel-tree for building images?. (should  I create separate BSP ?)
>
> You should definitely create a BSP, that way you can tune the system specific
> to your board,
>
> Cheers,
>
> Bruce
>
>>
>> Thanks in advance.
>> Best Regards,
>> Om Prakash Pal
>> ________________________________________
>> From: Bruce Ashfield [bruce.ashfield at windriver.com]
>> Sent: Monday, April 09, 2012 9:32 AM
>> To: Om Prakash PAL
>> Cc: yocto at yoctoproject.org
>> Subject: Re: [yocto] Porting of specific Kernel/Driver into yocto.
>>
>> On 12-04-08 10:04 AM, Om Prakash PAL wrote:
>>> Hi Bruce,
>>> Thanks for your reply.
>>> I am totally new to Yocto.
>>> I have gone through the section BSP/Linux kernel configuration and if I am not wrong then it explains how can we configure the kernel, not the how we can add/replace a  component(driver etc).
>>> lets take the example of UART driver, I want to add my own UART driver code.
>>> Should I write a separate recipe file (.bb) for UART Driver?.
>>> if yes then I have to write the recipe files for all my drivers that will be very time consuming.
>>> Is there any other way that I can port all my desired drivers into Yocto kernel?.
>>
>> No recipes are required per-driver, unless you are building them all
>> as out of tree modules.
>>
>> The typical way this is done is to simply work in the extracted linux
>> src tree (build/tmp/work/<your board>/linux-yocto-<hashes>/linux), manually
>> patch, or copy your drivers into the tree. At this point, you'll port
>> the drivers, doing test builds (bitbake -f -c compile linux-yocto) to
>> ensure that your port is working. When you've completed the build phase,
>> boot tests would be in order. (Do not do a 'clean' or you'll lose in
>> progress changes).
>>
>> When you are happy with the changes, the directory where you were working
>> is with the kernel git repository. So you can simply commit your
>> changes, and generate patches.
>>
>>     git format-patch -o<your directory>  HEAD^ (or however many commits
>> you have)
>>
>> Take those patches, create a layer with a bbappend and add them like
>> any other patch to any package. They'll be applied to subsequent builds
>> of the kernel.
>>
>> I'm skipping a lot of detail there, but it is all found in the various
>> manuals, and I don't want to repeat it here.
>>
>> Cheers,
>>
>> Bruce
>>
>>> Please help me.
>>> Thanks a lot in advance.
>>>
>>> Best Regards,
>>> Om Prakash Pal
>>> ________________________________________
>>> From: Bruce Ashfield [bruce.ashfield at windriver.com]
>>> Sent: Wednesday, April 04, 2012 6:17 PM
>>> To: Om Prakash PAL
>>> Cc: yocto at yoctoproject.org
>>> Subject: Re: [yocto] Porting of specific Kernel/Driver into yocto.
>>>
>>> On 12-04-04 04:46 AM, Om Prakash PAL wrote:
>>>> Hi,
>>>> I want to build my local kernel/Driver code, not the default one.
>>>> please help how can i do it ?.
>>>> any wiki/docs on this?.
>>>
>>> The BSP developer guides show how to extend the yocto kernels, and
>>> also have sections on custom/different kernel versions. Have you
>>> seen that doc yet ? Or have you seen it, and have specific questions ?
>>>
>>> Bruce
>>>
>>>>
>>>> Best Regards,
>>>> Om Prakash Pal
>>>> _______________________________________________
>>>> yocto mailing list
>>>> yocto at yoctoproject.org
>>>> https://lists.yoctoproject.org/listinfo/yocto
>>>
>>
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