One can achieve impressive boot-time & performance gains by replacing the BIOS (input/output system) with customized early initialization of the peripherals.
This is relevant to open X86 platforms, such as the Intel Atom processor, that are used in medical, mobile, and automotive applications.
There is an Intel White Paper on how to do this: "Fastboot BIOS - An Investigation of BIOS Speed Enhancement Featuring the Intel Atom Processor (September 2008)" @ http://download.intel.com/design/intarch/papers/320497.pdf
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