Note that you can only use modes which your graphics card supports via VESA BIOS Extensions (VBE), so for example native LCD panel resolutions may not be available. Set the resolution used on the ‘gfxterm’ graphical terminal. The default is ‘auto’, which tries to select a preferred resolution.
While fixing it is scheduled for the next release, meanwhile you can make use of the power of GRUB syntax and do it yourself. A possible configuration is detailed here, feel free to adjust to your needs. Currently autogenerating config files for multi-boot environments depends on os-prober and has several shortcomings.
The GRUB development team generally recommends embedding GRUB before the first partition, unless you have special requirements. You must ensure that the first partition starts at least 31 KiB (63 sectors) from the start of the disk; on modern disks, it is often a performance advantage to align partitions on larger boundaries anyway, so the first partition might start 1 MiB from the start of the disk.
The theme is configured through a plain text file that specifies the layout of the various GUI components (including the boot menu, timeout progress bar, and text messages) as well as the appearance using colors, fonts, and images. The GRUB graphical menu supports themes that can customize the layout and appearance of the GRUB boot menu. Example is available in docs/example_theme.
Set the partition where resides the FreeBSD kernel: set root=(/dev/ad4,msdos1). GRUB can boot a FreeBSD kernel by using the kfreebsd command. The procedure would look like this: 1. Load the kernel boot information.
GRUB 2 loads before any operating system. Menu display behavior is generally determined by settings in /etc/default/grub. Its modular components are loaded on an as-needed basis. Review the “Configuring GRUB 2” section above for specific entry and formatting guidance.
Otherwise they must appear on printed covers that bracket the whole aggregate. If the Cover Text requirement of section 3 is applicable to these copies of the Document, then if the Document is less than one half of the entire aggregate, the Document’s Cover Texts may be placed on covers that bracket the Document within the aggregate, or the electronic equivalent of covers if the Document is in electronic form.
Address can be either IP in dotted decimal notation, or symbolic name which is resolved using DNS lookup. If successful, this command also adds local link routing entry to the default subnet of address with name interface‘:local’ via interface. Configure additional network interface with address on a network card.
GRUB 2 loads Linux kernels, FreeBSD kernels, Mac OS X kernels, and several others; it can chainload other EFI boot loaders; it includes modules to read many different filesystems; it enables you to modify its boot options at boot time; it works in both BIOS and EFI modes; it uses complex scripts that detect and configure booting of a variety of OSes; it provides an interactive text-mode shell for expert troubleshooting; and more. In my experience, GRUB 2 is finicky and difficult to get working on EFI systems when configured manually; but this flaw is mitigated by the fact that its setup and configuration scripts usually do the right thing, obviating the need for tedious manual configuration. GRUB 2’s EFI features are less well-tested than its BIOS features. Some of these features duplicate functionality provided by the EFI or by OS-specific boot loaders.
(Note that reading a kernel from somewhere other than the ESP isn’t a problem by the preceding analysis—GRUB 2 can still boot other OSes even if it can’t access a Linux kernel file, so long as its own configuration and support files reside on the ESP. Whether you use a version of GRUB 2 that’s configured to look for its support files on the ESP or on a Linux partition, the software can load the Linux kernel from just about anywhere—the ESP, a Linux partition, or even from a RAID or LVM partition. ) This is arguably GRUB 2’s greatest strength; no other boot loader can read Linux kernels from such a wide variety of locations. Most commonly, the kernel and initial RAM disk will reside in the Linux /boot directory.
For example, ‘date 01-01’ will set the current month and day to January 1, but leave the year, hour, minute, and second unchanged. Otherwise, take the current date and time, change any elements specified as arguments, and set the result as the new date and time.
2 History of GRUB. GRUB originated in 1995 when Erich Boleyn was trying to boot the GNU Hurd with the University of Utah’s Mach 4 microkernel (now known as GNU Mach).