[RPi DT info] https://github.com/raspberrypi/documentation/blob/master/configuration/device-tree.md#part-3-using-device-trees-on-raspberry-pi
RPi bootloader detects a DT-ready kernel by checking for a specific trailer in kernel.img.
Using latest raspberrypi/firmware (firmware.inc) enables this check ability.
Using latest raspberrypi/tools (rpi-mkimage.bb) gives access to mkknlimg for adding the
required trailer to kernel image.
If KERNEL_DEVICETREE is filled in, the trailer is added to the kernel image before
kernel install task. While creating the SDCard image, this modified kernel is
put on boot partition (as kernel.img) as well as DeviceTree blobs (.dtb files).
If KERNEL_DEVICETREE is empty, this new process isn't operated, legacy one does.
KERNEL_DEVICETREE for RPi is really supported only starting from linux-rapsberry 3.18+
kernels, so as for now it defaults to empty (in machine config file).
Change-Id: Ifea71bbda729b8f3c47be7ba0ba03be5ad2ceeaa
Signed-off-by: Francois Muller <francois@concept-embarque.fr>
Yocto style recipes provide support for application of kernel
configuration fragments which is achieved with this change.
For further details see the Yocto Linux Kernel Development Manual
ref: http://www.yoctoproject.org/docs/1.6/kernel-dev/kernel-dev.html
In addition .bb files are simplified to take a SRCBRANCH which is
used by the SRC_URI set in linux-raspberrypi.inc and together with
the existing SRCREV define a checkout from the linux-raspberrypi
git repository.
A default configuration, defconfig, is provided as a baseline.
This is generated from bcmrpi_defconfig, as used in the existing
recipes, and so configuration options should be the same.
To change the kernel configuration a new configuration fragment
may be generated, as explained in the kernel development documentation
above, and this file then added to the SRC_URI via a .bbappend.
Added some minor refactoring and removed some useless code.
Change-Id: Ic72e14ec14ec3f042aeda0c6820f896be9c02e69
Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>
Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
When building against newer yocto project releases below failure
occurs.
| DEBUG: Executing shell function do_configure
| NOTE: make oldconfig
| make: *** No rule to make target `oldconfig'. Stop.
| ERROR: oe_runmake failed
| WARNING: exit code 1 from a shell command.
| ERROR: Function failed: do_configure
Fix this by trying to adapt more of the standard mechanism
that exists in yocto, in order to build "custom kernels".
Change-Id: I0598c0c16d84295a454976f60b56f9d35c36a4ba
Signed-off-by: Petter Mabäcker <petter@technux.se>
Acked-by: Andrei Gherzan <andrei@gherzan.ro>
From: Philipp Wagner <mail@philipp-wagner.com>
Change-Id: Ie4bc0d5f3f3301a1955dd077a0d2c3e3286266e3
Signed-off-by: Philipp Wagner <mail@philipp-wagner.com>
Signed-off-by: Alexandru Niculita <alexnick87@gmail.com>
