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GRUB
GRUB is a widely used bootloader — the program that loads and starts an operating system kernel at boot.
After firmware initializes the hardware, a bootloader like GRUB (GRand Unified Bootloader) locates the kernel, loads it into memory, and transfers control to it, often offering a menu of boot options. It is the bridge between firmware and a running OS. Describing a custom loader as 'GRUB-like two-stage' means it splits its job into a tiny first stage that then loads a larger second stage, the way GRUB does.
See also
- firmwareFirmware is the low-level software that runs first at power-on and prepares the machine before the operating system takes over.
- GPTGPT here means GUID Partition Table, the modern scheme for describing how a disk is divided into partitions.
- freestandingFreestanding code runs without an operating system or standard library beneath it — it must supply its own basics.
Referenced by
firmware · freestanding · GPT