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Andrei Nistor 0e5e358063 bootloader: make serial console configurable 
Currently, the serial console is hardcoded to ttyS0 in the bootloader
element.  This is a challenge for users that want to build images for
some baremetal servers. Supermicro servers, for example, use ttyS1 for
the serial over lan interface.

This patch adds a new environment variable DIB_BOOTLOADER_SERIAL_CONSOLE
that can be set to override the default.

Change-Id: Ie8173be8690ac0b7164ce9e5b66d3c1c18f844d6
2019-10-03 21:49:53 +00:00
..
cleanup.d Use [[ for =~ matches 2017-08-28 17:01:03 +10:00
environment.d bootloader: make serial console configurable 2019-10-03 21:49:53 +00:00
finalise.d bootloader: make serial console configurable 2019-10-03 21:49:53 +00:00
pkg-map Use x86 architeture specific grub2 packages for RHEL 2019-09-12 15:06:17 -04:00
README.rst bootloader: make serial console configurable 2019-10-03 21:49:53 +00:00

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 vga=normal``.

* ``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``.