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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/9c6e4e8a1f4becff3d3b5f638975fccfa6c0fff6

[BUILD][BRANCH] Fix bug on BUILD_BRANCH variable

* The build is always triggered via a parent pipeline in this version
of the CI/CD so it was necessary to fix the condition.

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/f8247528bd78a7ec9e633918ad9941873fe6e07b

[THINGS][TEST] Insert test job for Things distro

* This is a first implementation of automatic testing of Things distro
using SECO LAVA lab.
* The test is directed to 4 device types, one for each main architecture
(imx6, imx8, Rockchip, Intel).

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/6fb99d7ee3162ae26f9f7e3648da5f85a20872d1

[DOC] Add info about meta-layer MANIFEST_FILE var

The variable needs to be added as a project variable in order to specify
the manifest file on which the meta-layer needs to be integrated.

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/4653fee34dbaea035e4bec4221339d63c1910702

[FIX] Fix syntax errors in MACHINE parameter

The MACHINE parameter is fundamental in order to match the path of the
built artifacts gin GitLab CI

By default, U-boot sends the console output to both uart and video.
This commit suppresses the video output (where the boot logo is displayed)

The U-boot console output was temporarily suppressed to prevent it from overlapping with
the boot logo. This commit re-enables it.

Enable UART by default for raspberryPi.
With this variable set, meta-raspberrypi will add enable_uart=1 to config.txt and set
the correct tty in the kernel cmdline args

* The submodule points to the repository containing all CI/CD files
* Insert .gitlab-ci.yml file importing file for automatic manifest
integration

revert the effects of this commit in meta-raspberrypi: 80a12f7fddfeae28c43242765374e7ade3a2a59e
which sets some modules in the kernel config from y to m and causes psplash and the entire OS to hang shortly after boot

exclude the recipe in meta-raspberrypi that sets the raspberry icon as the psplash image

By default the kernel logo is displayed at the top-left corner of the screen and it's repeated $(nproc) times.
Set logo-pos and logo-count params for fbcon so that the logo image is cenetered and not repeated.

- display the splash screen
- enable the splaspos environment variable to configure positioning of the splash image
- enable the splashsource library, which allows to load the logo image from a custom source (see README.splashprepare)
- quiet console messages (see README.silent), which would otherwise overlap with the logo image
- enable CONFIG_SILENT_U_BOOT_ONLY to prevent U-boot from adding "quiet" to the bootargs, which would also hide the kernel logo
- NOTE: in the future we might want to direct the console output to the GPIO serial instead of silencing it entirely