Семен Сатановский положение бут-блока относительно начала

Возможно это неправильное предположение, но я имел в виду положение бут-блока в адресном пространстве флешки,

The most important chips which responsible for the BIOS code handling are the southbridge and northbridge. In this respect, the northbridge is responsible for the BIOS shadowing, handling accesses to RAM and BIOS ROM, while the southbridge is responsible for enabling the ROM decode control, which will forward (or not) the memory addresses to be accessed to the BIOS ROM chip. The "special" addresses shown below can reside either in the system DRAM or in BIOS ROM chip, depending on the southbridge and northbridge register setting at the time the BIOS code is executed.