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The GRUB command line is not a regular Linux shell, like e.g. bash, and accepts only certain GRUB-specific commands, documented by various Linux distributions. [12] Once boot options have been selected, GRUB loads the selected kernel into memory and passes control to the kernel. Alternatively, GRUB can pass control of the boot process to ...
The second-stage loader (stage2, the /boot/grub/ files) is loaded by the stage1.5 and displays the GRUB startup menu that allows the user to choose an operating system or examine and edit startup parameters. After a menu entry is chosen and optional parameters are given, GRUB loads the linux kernel into memory and passes control to it.
UEFI binaries like GRUB or the Linux kernel can be booted via the boot manager or from the command-line interface. U-Boot runs a command-line interface on a console or a serial port. Using the CLI, users can load and boot a kernel, possibly changing parameters from the default.
LILO (Linux Loader) is a boot loader for Linux and was the default boot loader for most Linux distributions. Unlike loadlin , it allowed booting Linux without having DOS on the computer. [ 3 ] As of 2009, most distributions had switched to GRUB as the default boot loader. [ 4 ]
Advanced command Scriptable Supported architecture Supported executable Supported protocol Supported decompression Others GRUB Legacy: Yes No x86 (PC) Multiboot 1, Linux zImage, Linux bzImage and others TFTP gzip GRUB 2: Yes Yes x86 (PC, EFI, UEFI, coreboot, OLPC), IA-64, ARM (U-Boot, UEFI), PowerPC (OpenFirmware), MIPS, SPARC (OpenFirmware)
SILO is able to access ext2, ext3, ext4, UFS, romfs and ISO 9660 file systems, enabling it to boot arbitrary kernels from them (more similar to GRUB). SILO also has support for transparent decompression of gzipped vmlinux images, making the bzImage format unnecessary on SPARC Linux. SILO is loaded from the SPARC PROM.
In the example 2 above, GRUB 2 stores its core.img in a BIOS boot partition. When used, the BIOS boot partition contains the second stage of the boot loader program, such as the GRUB 2; the first stage is the code that is contained within the Master Boot Record (MBR). Use of this partition is not the only way BIOS-based boot can be performed ...
Many Linux distributions ship a single, generic Linux kernel image – one that the distribution's developers create specifically to boot on a wide variety of hardware. . The device drivers for this generic kernel image are included as loadable kernel modules because statically compiling many drivers into one kernel causes the kernel image to be much larger, perhaps too large to boot on ...