673e4d4783
This change is done in order to make the troubleshooting of images in non CI/CD deployments easier. We pick GRUBs upstream defaults to select as neutral a set of values as possible. If you need additional time for debugging or hidden menus you should override these values in your downstream elements. Change-Id: I08155152b63f629c4eaf72d29ff931e92d7e4b33
40 lines
1.5 KiB
ReStructuredText
40 lines
1.5 KiB
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==========
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bootloader
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==========
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Installs ``grub[2]`` on boot partition on the system.
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Arguments
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=========
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* ``DIB_GRUB_TIMEOUT`` sets the ``grub`` menu timeout. It defaults to
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5 seconds. Set this to 0 (no timeout) for fast boot times.
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* ``DIB_GRUB_TIMEOUT_STYLE`` sets the visibility of the ``grub`` menu.
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It defaults to ``menu``. Set this to ``hidden`` (or ``countdown``
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as an alias) to not display the menu until the timeout is reached at
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which point the default boot entry will be selected.
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* ``DIB_BOOTLOADER_DEFAULT_CMDLINE`` sets parameters that are appended
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to the ``GRUB_CMDLINE_LINUX_DEFAULT`` values in ``grub.cfg``
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configuration. It defaults to ``nofb nomodeset gfxpayload=text``.
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* ``DIB_BOOTLOADER_USE_SERIAL_CONSOLE`` allows usage of a serial console
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to be disabled in the resulting image by setting to a value of ``False``.
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* ``DIB_BOOTLOADER_SERIAL_CONSOLE`` sets the serial device to be
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used as a console. It defaults to ``hvc0`` for PowerPC,
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``ttyAMA0,115200`` for ARM64, otherwise ``ttyS0,115200``.
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* ``DIB_BOOTLOADER_VIRTUAL_TERMINAL`` sets the virtual terminal be
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used as a console. It defaults to ``tty0``. When explicitly set
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to an empty string then no virtual terminal console kernel argument
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is added.
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* ``DIB_NO_TIMER_CHECK`` allows the default kernel argument,
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``no_timer_check`` to be removed from the kernel command line
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when the value is set to ``False``.
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* ``DIB_SKIP_GRUB_PACKAGE_INSTALL`` when set to ``True`` will not install any
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grub packages, and will assume all necessary packages are already installed.
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