diskimage-builder/diskimage_builder/elements/bootloader
Pierre Crégut 6e71bd4239 Makes EFI images bootable by bios
For Bios and EFI compatibility, grub must be installed twice.
This patch adds the bios version when EFI is selected. The GPT EFI  block partitioning
already adds the bios partition, but the bootloader only called grub once.

Change-Id: Iee6c8b3b97b3cfff4562bcb30a50800f5ade894a
Closes-Bug: #1889089
2020-08-18 14:41:21 +10:00
..
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 Makes EFI images bootable by bios 2020-08-18 14:41:21 +10:00
pkg-map Makes EFI images bootable by bios 2020-08-18 14:41:21 +10:00
README.rst update grub cmdline to current kernel parameters 2020-06-14 00:39:42 -05:00

==========
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``.