Re: workflow - kernel config

[Darren Hart <dvhart@linux.intel.com>]

On 11/07/2011 09:58 AM, Bruce Ashfield wrote:
> On Mon, Nov 7, 2011 at 11:39 AM, Richard Purdie
> <richard.purdie@linuxfoundation.org> wrote:
>> On Fri, 2011-11-04 at 15:15 -0400, Bruce Ashfield wrote:
>>> On Fri, Nov 4, 2011 at 1:23 PM, Robert Berger
>>> <gmane@reliableembeddedsystems.com> wrote:
>>>> Hi,
>>>>
>>>> I'm playing with poky-edison-6.0 and the default 2.6.37.6 kernel on a
>>>> beagle board with core-image-sato-sdk.
>>>>
>>>> Interestingly enough there is user space support e.g. for oprofile, but
>>>> oprofile is not configured in the kernel.
>>>>
>>>> The same for lacencytop and powertop,...
>>>
>>> We have feature descriptions for all of the above as components in the
>>> linux-yocto
>>> kernel repository, but they do need to be turned on and tested on a per board
>>> basis.
>>>
>>> We can trigger kernel options based on userspace packages being enabled or
>>> disabled, but that still wouldn't be a guarantee that they'd work. The
>>> options that
>>> are within the tree are a documentation of what has actually been tested.
>>>
>>> The 2.6.37 tree was a transition point,and we've continued standardizing the
>>> options and feature set in the later kernels. For yocto 1.2 we'll have a better
>>> defined and consistent set of feature blocks. It's a building process
>>> and we move
>>> forward.
>>>
>>> As others will point out there are other/deeper beagle board BSPs and layers
>>> (i.e. meta-texasinstruments) that likely already have support for these options\
>>> (but I haven't checked recently), so that's an avenue to explore as well.
>>>
>>>>
>>>> So I was wondering what's the preferred workflow to start with the
>>>> "yocto-default" kernel config and add kernel configuration options
>>>> afterwards.
>>>>
>>>> What's I've tried so far is:
>>>>
>>>> bitbake virtual/kernel -c clean
>>>> bitbake virtual/kernel -c configure
>>>> bitbake virtual/kernel -c menuconfig
>>>> bitbake virtual/kernel -c compile
>>>> bitbake virtual/kernel -c deploy
>>>
>>> This is one flow that will work to make changes to the default kernel, and
>>> test them on a board. I use something like:
>>>
>>>  bitbake -f -c configure linux-yocto
>>>  bitbake -f -c menuconfig
>>>  bitbake -c linux-yocto
>>
>> I suspect you mean:
>>
>> bitbake -f -c configure linux-yocto
>> bitbake -f -c menuconfig
>> bitbake linux-yocto
> 
> Heh. Indeed. Random use of -c does not produce the results that
> one is looking for.

Close. Still need the target for menuconfig as well. Details ;-)

$ bitbake linux-yocto -c configure -f
$ bitbake linux-yocto -c menuconfig -f
$ bitbake linux-yocto


-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel