[Buildroot] new TI kernel version for beaglebone black

[Hadrien Boutteville <hadrien.boutteville@gmail.com>]

Hello Dan,

On Fri, 30 May 2014 14:18:26 -0700, Dan Pattison wrote:
> I have a question that is probably not 100% buildroot related, but was 
> hoping to get some help. I am using buildroot to build a kernel and 
> rootFS for a beaglebone black. Buildroot is awesome and builds 
> everything fine. The board boots up and all packages work properly. 
> Unfortunately, USB seems to be badly broken. In the kernel I have USB 
> driver enabled and USB Announce New Devices turned on. Googling around I 
> find several people with the same problem, hotplug does not work at all, 
> and no device I have tried shows up in dmesg or lsusb on cold or warm 
> boot. A band aid is to use a powered USB hub (have not tried that). Some 
> guys on the beagleboard.org IRC say to try a newer kernel version (3.14 
> or >) because beaglebone USB is fixed in newer kernel versions. Current 
> buildroot beaglebone black kernel version is 3.12.10
> 
> In buildroot I used make beaglebone_defconfig.
> Under the Kernel menu, Custom Git repository is selected.
> The git URL is https://git.ti.com/ti-linux-kernel/ti-linux-kernel.git
> The custom repository version is 7f280334068b7c875ade51f8f3921ab311f0c824
> The def config is board/beaglebone/linux-3.12.config

I'm using the default beaglebone_defconfig on BBB and USB hotplug works
fine. In the default kernel config the options are selected as modules,
so you have to load them:

  $ modprobe musb_am335x
  $ modprobe musb_dsps

After that, outputs in dmesg will tell you that the USB port is found
(short version) and USB hotplug will work (I just tested).

> How was the custom repository number 
> (7f280334068b7c875ade51f8f3921ab311f0c824) derived? Looking on the TI 
> gitorious site, I see they are working on kernel 3.15. How can I make 
> buildroot use the newer version? How do I find the newer custom 
> repository version? I tried to find my answer with google, but I must 
> not be using the correct search term. Please excuse the newbish questions.

Regards,

Hadrien