* Allow usage of commandline from bootloader
* Adapt the default commandline:
** Remove earlyprintk, should be used for debug only

* Remove unused lines
* Added bootscript to machine essential rdepends
  This way the inclusion into the image and the recipe live in the same
  layer

We want to overlay the device tree in the install script. Thus we can
create a device specific device tree with the generic name
"devicetree.dtb".

This removes the neccessary pacthing of the boot.cfg.

However, currently we cannot load the devicetree with the bootloader and
thus append the device tree to the kernel at installation time and name
the resulting binary "linuximage".

Add the bootscript from current rocko commit
ad543879 with following modifications:
- Move imx6guf to san and imx6ullguf to nallino
- Remove the "inherit release" as the release is not supported right now

The bootscript recipe builds but does not output the correct script yet.

The variables IMAGE_BOOT_FILES and IMAGE_FSTYPES are less machine
dependent and are more distro options.

Thus move them to meta-guf-distro.

Also edit the README accordingly.

The ordinary kernel.bbclass should implement all necessary dependencies
needed to build the linux kernel.

I tried to remove the build dependencies and it worked for me, thus
remove the unneccessary dependencies.

Normally teh device tree blobs will be built without symbols like the
aliases that may be used like references.

However, the overlay method relies on the fact that the symbols are
present in the devcie tree to be overlayed. This can be eigther achieved
by using a textual representation of the devcie tree or by additional
symbols in the device tree blob.

Introduce the latter, so that we can use the device tree blob as overlay
basis.

* disable TIMER_CONTROL register TD[1:0] bit configuration in PCF8563 driver
  probe since we use that bits for bootselect

* Pull the rtc-pcf8563.c source from the kernel-tree at v5.4.23
 (bfe3046ecafdd71ba6932deebe2eb357048b7bfc)
* Remove the in-tree driver from the defconfig
* Add the module to the MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS for san* and
nallino platforms

- increased U-Boot boot delay to 3 seconds to be able to interrupt the bootloader properly with 'ESC' as configured

- add a first NALLINO configuration to allow U-Boot build ('bitbake u-boot')

- allow our linux-stable-5.4 kernel also to be build for NALLINO

- added U-Boot for NALLINO taken from GUF-Yocto-rocko-9.2.0-IMXULLGUF-bsp

- update to new kernel version
  - USB support
  - thernet support
  - audio support

- added documentation for running basic tests

- use new kernel version with all I2C devices present for testing on 400 kHz bus rate

- cleaned up machine config to be able to add more boards later

- use new kernel with SIS9255 touch support and updated kernel's defconfig

- added vpu firmware to 'linux-firmware' with an bbappend file that is a much cleaner solution than an extra package

refs #41059: BSP/SDK: changed rootfs image archive type to 'tar.bz' since FlashNGo tar doesn't support 'tar.xz'

refs #41059: BSP/SDK: changed rootfs image archive type to 'tar.bz' since FlashNGo tar doesn't support 'tar.xz'

- updated kernel version that know comes with a working display

This layer will become the machine only layer and thus will not define
the distro.

Thus remove the distro (but move it to the meta-guf-distro layer).

In order to divide the meta-guf layer into -machine and -distro layers
we need to pull out machine specific packages into the machine
description.

Add the firmware package to the MACHINE_ESSENTIAL_EXTRA_RDEPENDS to
build and install it.

See also: https://www.yoctoproject.org/docs/1.8/ref-manual/ref-manual.html#var-MACHINE_ESSENTIAL_EXTRA_RDEPENDS

* Split layer into meta-guf-machine and meta-guf-distro

- added first compilable Qt 5.14.1 stack on top of Wayland/using the Wayland backend of Qt5
- it's nearly the same stack from the Zeus evaluation on Wandboard DL with the following exceptions:
  - 'qt5everywheredemo' did not compile, removed for now, will later be added
  - 'qtopcua' did not compile, removed for now, will later be added
- the important points here are:
  - the distro config has to set explicitely eglfs support on qtbase package, otherwise configure does not set the correct GL flags and complains about that
  - the distro config has to set explicitely gstreamer support on qtmultimedia, otherwise configure does not include gstreamer support

- added GPU test programs
- added Weston OS initialization

- added GStreamer to the OS image

- added Big Bug Bunny test video trailer for VPU verification

- added SDMA and VPU firmware from https://github.com/armbian/firmware/raw/master/

- update kernel to new head

- set kernel recipe to crurrent HEAD of GUF linux-stable
- set kernel defconfig to current guf_imx_v6_v7_defconfig
  - with appended device tree enabled
  - with default kernel command line

issue #41059: Kernel Build: removed the GUF support patch, which is obsolete now since we use the kernel from our Git repository now 

issue #41059: Kernel Build: removed dead code in kernel recipe and the GUF support patch, which is obsolete now since we use the kernel from our Git repository now 

The GuF linux kernel port is currently hosted on a private gitlab
account.
It is accessable via git://git@gitlab.com/guf-yocto/stable.git

Thus modify the SRC_URI to fetch from the gitlab repository.

Keep in mind that you need access to the repository using SSH PKI.

The guf setup uses the Dunfell codebase (Yocto version 3.1).
This should be refelcted with the DISTO_VERSION variable.