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GRUB, with entries for Ubuntu and Windows Vista, an example of dual booting. Multi-booting is the act of installing multiple operating systems on a single computer, and being able to choose which one to boot. The term dual-booting refers to the common configuration of specifically two operating systems. Multi-booting may require a custom boot ...
This can be useful in the case of hardware that needs to be switched on via software and for which such configuration programs are proprietary and only available for DOS. This booting method is less necessary nowadays, as Linux has drivers for a multitude of hardware devices, but it has seen some use in mobile devices. Another use case is when ...
Boot Configuration Data is stored in a data file that has the same format as Windows Registry hives and is eventually mounted at registry key HKEY_LOCAL_MACHINE\BCD00000 [6] (with restricted permissions [7]). For UEFI boot, the file is located at /EFI/Microsoft/Boot/BCD on the EFI System Partition.
A bootloader, also spelled as boot loader [1] [2] or called bootstrap loader, is a computer program that is responsible for booting a computer and booting an operating system. If it also provides an interactive menu with multiple boot choices then it's often called a boot manager .
When a computer is powered on, the boot manager checks the boot configuration and, based on its settings, then executes the specified OS boot loader or operating system kernel (usually boot loader [62]). The boot configuration is defined by variables stored in NVRAM, including variables that indicate the file system paths to OS loaders or OS ...
During the boot phase, CONFIG.SYS and AUTOEXEC.BAT are executed, along with the configuration settings files WIN.INI and SYSTEM.INI. Virtual device drivers are also loaded in the startup process: they are most commonly loaded from the registry ( HKLM\System\CurrentControlSet\Services\VxD ) or from the SYSTEM.INI file.
Though NTLDR can boot DOS and non-NT versions of Windows, boot.ini cannot configure their boot options. For NT-based OSs, the location of the operating system is written as an Advanced RISC Computing (ARC) path. boot.ini is protected from user configuration by having the following file attributes: system, hidden, read-only.
For example, Das U-Boot may be split into two stages: the platform would load a small SPL (Secondary Program Loader), which is a stripped-down version of U-Boot, and the SPL would do some initial hardware configuration (e.g. DRAM initialization using CPU cache as RAM) and load the larger, fully featured version of U-Boot. [74]