[MinnowBoard] Kernel .config file lacks CONFIG_FB_DEFERRED_IO

Ferchu R chamac2 at gmail.com
Fri May 23 19:57:26 UTC 2014


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
>
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>
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