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diskimage-builder/diskimage_builder/elements/bootloader
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Matthew Thode bea81bd234
update gentoo to allow building arm64 images 
Adds:

1. grub-efi package mappings
2. efi-64 support
3. default (openrc) arm64 profile
4. systemd arm64 profile

Cleans up the keywords and use flags in 02-gentoo-02-flags.  Most stuff
was stablized.  Also cleaned up some formatting for the if statements.

Enables less trusted overlays (up to the end user to verify).

in 10-gentoo-image I cleaned up some bash lint things as well.
using && instead of -a and avoiding $?

Change-Id: I3dffe1aab4bbdc4946a9bf2269bf0cde49529a4e
2020-08-17 23:50:39 -05:00
..
cleanup.d update grub cmdline to current kernel parameters 2020-06-14 00:39:42 -05:00
environment.d update grub cmdline to current kernel parameters 2020-06-14 00:39:42 -05:00
finalise.d bootloader: make serial console configurable 2019-10-03 21:49:53 +00:00
pkg-map update gentoo to allow building arm64 images 2020-08-17 23:50:39 -05:00
README.rst update grub cmdline to current kernel parameters 2020-06-14 00:39:42 -05:00

README.rst 

==========
bootloader
==========

Installs ``grub[2]`` on boot partition on the system. In case GRUB2 is
not available in the system, a fallback to Extlinux will happen. It's
also possible to enforce the use of Extlinux by exporting a
``DIB_EXTLINUX`` variable to the environment.

Arguments
=========

* ``DIB_GRUB_TIMEOUT`` sets the ``grub`` menu timeout.  It defaults to
  5 seconds.  Set this to 0 (no timeout) for fast boot times.

* ``DIB_BOOTLOADER_DEFAULT_CMDLINE`` sets parameters that are appended
  to the ``GRUB_CMDLINE_LINUX_DEFAULT`` values in ``grub.cfg``
  configuration. It defaults to ``nofb nomodeset gfxpayload=text``.

* ``DIB_BOOTLOADER_SERIAL_CONSOLE`` sets the serial device to be
  used as a console. It defaults to ``hvc0`` for PowerPC, 
  ``ttyAMA0,115200`` for ARM64, otherwise ``ttyS0,115200``.