diskimage-builder/diskimage_builder/elements/bootloader
Ian Wienand 7b4c8abce3 Choose appropriate bootloader for block-device
In the prior change we added block-device-[mbr|gpt|efi] elements to
create appropriate disk-layouts.

This adds an environment flag to each so the bootloader can install
the right thing.  The EFI install path is updated to work with this
(this part a copy of I572937945adbb5adaa5cb09200752e323c2c9531)

We do some basic sanity checking in the block-device elements;
e.g. mbr is not suitable for aarch64, and efi is not suitable for
power.

This updates the bootloader to install EFI where appropriate

Co-Authored-By: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Change-Id: Ib80acbfd9a12efd976c3fa15a5d1081eb0799305
2018-02-23 10:04:44 +11:00
..
cleanup.d Use [[ for =~ matches 2017-08-28 17:01:03 +10:00
environment.d Send custom parameters in bootloader to GRUB_CMDLINE 2017-03-08 15:43:46 +01:00
finalise.d Choose appropriate bootloader for block-device 2018-02-23 10:04:44 +11:00
pkg-map Choose appropriate bootloader for block-device 2018-02-23 10:04:44 +11:00
README.rst Fix typo in CMDLINE env var for bootloader 2017-03-22 12:02:37 +01:00

==========
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 the CMDLINE parameters that
  are appended to the grub.cfg configuration. It defaults to
  'nofb nomodeset vga=normal'