rpi-default-versions: Use 3.12.X as default kernel version

Change-Id: Ief7949be4b9726b5b6ba58e6280f6b6ca3fdfdc4
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
linux-raspberrypi: Update v3.12.11 to v3.12.18

Change-Id: Ifa763e4352051e4533eac98b4f7c74daf791cf72
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
linux-raspberrypi: Update kernel to 3.12.21

Amongst other patches, this release includes a fix to an issue with
gstreamer1.0 and v4l2src blocking

ref: https://bugzilla.gnome.org/show_bug.cgi?id=726521

ref: http://tinyurl.com/mkqooeg

To make use of the optional fix the module parameter gst_v4l2src_is_broken
needs to be set when loading bcm2835-v4l2.ko

With this in place, and with userland and gstreamer1.0-omx patches,
gstreamer1.0 can be used with PiCam via v4l2src instead of raspivid.

(There may still be performance issues to be addressed for v4l2src vs
raspivid pipe & fdsrc).

Change-Id: Ia0ed4e6c8f27df9bb12ae2350526f6314e016d51
Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>
README: Add patch guidelines info

Change-Id: I2dac882a6dbe2fbca63a5c7405339edcca18cf04
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
userland: Update to remote's HEAD

Change-Id: If0e36184c741da5d68c158e1fb582050f5835bf9
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
userland: Add '--no-as-needed' linker flag

This is done to ensure all specified shared libraries are linked against
applications (e.g. raspivid)i.

libmmal_vc_client.so makes use of __attribute__(constructor) to ensure
that supplier components (e.g. camera) are loaded when the static library is
loaded.

raspivid, and possibly other applications, link against libmmal_vc_client.so,
causing the ctor to execute, but there is no needed dependency.

Some build environments (e.g. Yocto/OpenEmbedded) pass the '--no-as-needed'
linker flag which removes the dependency on libmmal_vc_client and thus
components are not registered.

In this situation raspivid then gives an error of the form
  root@raspberrypi:~# raspivid -o test
  mmal: mmal_component_create_core: could not find component 'vc.ril.camera'
  mmal: Failed to create camera component
  mmal: main: Failed to create camera component
  mmal: Failed to run camera app. Please check for firmware updates

For further details see:
https://lists.yoctoproject.org/pipermail/yocto/2014-June/019933.html

Change-Id: I9d787fd83379e8b6428dde3827395c8b96be1f7f
Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>
Acked-by: Andrei Gherzan <andrei@gherzan.ro>
firmware: Update to remote's HEAD

Change-Id: I9e28318c5746484ebde636295c66f7b6b64ba2fb
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>