More seriously, at least for modern systems: the engineers who designed the computer created a memory map that defined which hardware can be found where. They simply ensured that the reset vector would point to an area of non-volatile memory that can be read directly (e.g. an EEPROM would work since you feed it an address and it returns data, much like RAM). That jump would be to somewhere else in non-volatile memory, an area that would have enough space for the code to continue the initialization process. You would have to ask someone more familiar with CPU architecture why they use an indirect approach. My guess is that many CPU architectures define a vector table, which is a list of places the CPU will jump to when various contditions are met (e.g. an interrupt, or reset).