[MinnowBoard] Kernel .config file lacks CONFIG_FB_DEFERRED_IO

[Ferchu R]

Hi Darren.

I am going to run a Windiff or something similar between my already
modified files (/usr/src/kernel/.config and
/usr/src/kernel/drivers/video/Kconfig in my Minnowboard) and the original
"sotck" files, but I don't know where I can find them. Can I find them on
the bitbake Minnowboard directory structure
(/opt/minnowboard/ourbuild/setup-scripts) ??.

Note: I found a .config in
"/opt/minnowboard/ourbuild/setup-scripts/build/tmp-angstrom_v2013_12-eglibc/sysroots/minnow/usr/src/kernel".

Thanks.


2014-05-28 19:03 GMT-05:00 Darren Hart <dvhart at linux.intel.com>:

> Details on working with the kernel build by the yocto project are here:
>
> http://www.yoctoproject.org/docs/current/kernel-dev/kernel-dev.html
>
> If you find a particular task you want to perform is not adequately
> covered there, please do let me know.
>
> As to support for this particular feature, if you can send me the delta
> between the stock config and the one you modified, I can probably just add
> it to the minnow config fragment and you can then just rebuild the angstrom
> image per the angstrom instructions using the latest git of meta-minnow.
>
> If all you want to do is quickly rebuild the kernel (and don't care about
> packaging, etc), then Angstrom provides a linux-dev (or similar) package
> which you can find using "opkg list" and install with "opkg install ..."
> and the kernel source will then be in /usr/src/linux...
>
> There you can "make menuconfig; make; make modules; make modules_install;
> make install" as per usual.
>
> --
> Darren
>
> --
> Darren Hart Open Source Technology Center
> darren.hart at intel.com             Intel Corporation
>
> From: Ferchu R <chamac2 at gmail.com>
> Reply-To: MinnowBoard Development and Community Discussion <
> elinux-minnowboard at lists.elinux.org>
> Date: Monday, May 26, 2014 at 16:32
> To: MinnowBoard Development and Community Discussion <
> elinux-minnowboard at lists.elinux.org>
> Subject: Re: [MinnowBoard] Kernel .config file lacks CONFIG_FB_DEFERRED_IO
>
> I seted up bitbake for building Angstrom on Ubuntu 12.10. My new strategy
> is not to to build the kernel module using the same Angstrom target system
> as host, but building it on Ubuntu targetting the "minnowboard
> environment". As I should pass KERNEL_SOURCE_DIR as make argument when
> building the module, what path should use in this case, if the directory
> structure is "/opt/minnowboard/ourbuild"?.
>
> Thanks.
>
>
> 2014-05-23 14:57 GMT-05:00 Ferchu R <chamac2 at gmail.com>:
>
>> Hi Darren.
>>
>> The driver's source code uses a struct named "fb_info" that is defined in
>> fb.h (this file is part of the standard kernel. Within the definition of
>> fb_info is the following code:
>>
>> #ifdef CONFIG_FB_DEFERRED_IO
>>     struct delayed_work deferred_work;
>>     struct fb_deferred_io *fbdefio;
>> #endif
>>
>> Because of that, when CONFIG_FB_DEFERRED_IO is not present, member
>> fbdefio are not included in fb_info struct, thus I am getting the error at
>> build time.
>>
>> The manufacturer gave me the advice of running "make menuconfig" on the
>> kernel source directory and add "Displaylink USB Framebuffer support"
>> option. After that,  both files (.config and Kconfig) were automatically
>> changed in a way all entries involving CONFIG_FB_DEFERRED_IO now are equal
>> to those of their counterpart in Ubuntu. So I think the files at this time
>> are not th problem. The manufacturer told me too that I should re-compile
>> the kernel for the changes to take effect. How could I do this?. Should I
>> only cd to the kernel source directory and run make?. I am running all this
>> stuff in the same Angstrom Minnow system.
>>
>> Thanks and best regards.
>>
>>
>>
>>
>>
>>
>>
>>
>> 2014-05-22 23:02 GMT-05:00 Darren Hart <dvhart at linux.intel.com>:
>>
>> On 5/19/14, 21:03, Fernando wrote:
>>>
>>>> The hardware manufacturer has told me that just adding
>>>> CONFIG_FB_DEFERRED_IO
>>>> to the .config file, is not going to work. It is necessary add a section
>>>> which make reference to the CONFIG_FB_DEFERRED_IO feature in the KConfig
>>>> file.
>>>>
>>>> I hope that someone can advice me if this is the right approach and if
>>>> there
>>>> is a template to add a new section to this KConfig file.
>>>>
>>>
>>> I'm not really sure how to answer your question. The structure you
>>> reference in the include/linux headers is impacted by whether or not
>>> CONFIG_FB_DEFERRED_IO is configured in or not.
>>>
>>> Does what you are trying to do work on a typical desktop Linux
>>> distribution? Ubuntu, Fedora?
>>>
>>> If so, can you compare the files - exactly how are things different?
>>>
>>> --
>>> Darren Hart                     Open Source Technology Center
>>> darren.hart at intel.com                       Intel Corporation
>>>
>>> _______________________________________________
>>> elinux-MinnowBoard mailing list
>>> elinux-MinnowBoard at lists.elinux.org
>>> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>>>
>>
>>
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