Linux Course: Understanding the GRUB Bootloader
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This course provides a basic understanding of GRUB and gives you some illustrations on how to secure it and fix several common problems. GRUB stands for Grand Unified Bootloader and was created in 1995 by Erich Boleyn as he wanted to have a multiboot option. Intel based motherboards must be started with a 16-bit operating system because of a limitation to 640 kilobytes of RAM at startup. GRUB is used to facilitate the 16-bit requirement and load the 32-bit Linux kernel. The AMD CMOS is 64-bit so it can load the 64-bit kernel for Linux. In order for GRUB to work it must use a three step process on CentOS.
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