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Allow manual intervention

In some cases we need manual intervention to specify parameters for the OS,

bootloaders usually have a way to interrupt automatic loading and insert parameters. This is done by waiting a certain default time before autoloading, during this time the user has to press a specific key (Esc in case of LILO) or any key in case of UBOOT. When a key is pressed, a prompt is displayed and the user has a chance to change certain environment variable or maybe load a different kernel from memory, disk, network etc.

PC boot sequence
Get the kernel
Prepared by Ori Idan Helicon technologies