openstack/diskimage-builder
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diskimage-builder/diskimage_builder/elements/bootloader/README.rst
Maksim Malchuk 4fbf564615 Set grub timeout style 
Set the grub timeout style to display the menu. By default it set to
'hidden' but can be changed to 'menu' to display the menu and then
wait for the timeout expire before booting the default entry.

Change-Id: I8c58407ef645d528dd77efe866bfe0389cbbbd33
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>
2023-09-15 20:31:26 +00:00

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bootloader

Installs grub[2] on boot partition on the system.

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_GRUB_TIMEOUT_STYLE sets the visibility of the grub menu. It defaults to hidden (or countdown as an alias). Set this to menu to display the menu and then wait for the timeout set by DIB_GRUB_TIMEOUT to expire before booting the default entry.
  • 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.
  • DIB_BOOTLOADER_VIRTUAL_TERMINAL sets the virtual terminal be used as a console. It defaults to tty0. When explicitly set to an empty string then no virtual terminal console kernel argument is added.