[linux-yocto] Keyboard on Beaglebone Black

[Bruce Ashfield]

On 14-06-24 11:06 AM, Mehaffey, John wrote:
> On Tuesday, June 24, 2014 5:56 AM, Bruce Ashfield wrote:
>> On 14-06-24 07:06 AM, Kevin Hao wrote:
>>> On Tue, Jun 24, 2014 at 10:34:35AM +0800, Kevin Hao wrote:
>>>> On Mon, Jun 23, 2014 at 11:39:57AM -0400, Bruce Ashfield wrote:
>>>>> On 14-06-23 02:59 AM, Sven Vos wrote:
>>>>>> Hello,
>>>>>>
>>>>>> I am trying to get a Keyboard working on a Beaglebone Black. But
>>>>>> after building a non-custom core-image-minimal and running it on
>>>>>> the beaglebone black, i saw that the display works, but my keyboard doesnt.
>>>>>> I think it has something to do with the USB OTG but i have not a
>>>>>> clue what need to be done to get it work. Does anybody got it working yet?
>>>>>
>>>>> Kevin has been supporting the yocto BSP for us, so adding him on the
>>>>> cc'.
>>>>>
>>>>> That being said, I'm not sure if the BBB is in a lab environment for
>>>>> him, and hence no physical USB keyboard to use or test.
>>>>
>>>> I do have a BBB in hand. I will take a look at this issue.
>>>
>>> It seems that the usb drivers are built as modules by default. But the
>>> kernel-modules is not installed by default on core-image-minimal image.
>>> That's the reason why the usb keyboard can't work. So we have two options:
>>>     a) config usb drivers as built-in
>>>     b) install the kernel-modules on core-image-minimal
>>>
>>> I prefer to option (a) since it makes no sense to build them as
>>> modules for a specific BSP. But it seems that many drivers such as
>>> sound, display and usb are configured as modules in beaglebone.cfg. Do
>>> we have any special reason to do so? Should we convert all of them to built-in?
>>
>> No special reason that I know of. I'm find with converting them to built-in.
>> Basic/core functionality is fine to include at all times!
>
> Well, according to the poky ref manual:
> * core-image-minimal: A small image just capable of allowing a device to boot.

That's userspace, not the kernel. We have poky tiny and other stripped
down kernel options for those that need something really small.

The standard kernel is fully functional, which is what we are building
here.

Bruce

>
> * core-image-basic: A console-only image with more full-featured Linux system functionality installed.
>
> The USB subsystem is huge, and most of it is modules, for good reason.
>
> Perhaps Sven should be building core-image-basic?
>
> John Mehaffey
>
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