June 2017
Intermediate to advanced
478 pages
13h 14m
English
The bootloader is the first piece of code to run when the processor is powered up. The way the processor locates the bootloader is very device specific, but in most cases there is only one such location, and so there can only be one bootloader. If there is no backup, updating the bootloader is risky: what happens if the system powers down midway? Consequently, most update solutions leave the bootloader alone. This is not a big problem, because the bootloader only runs for a short time at power-on and is not normally a great source of run-time bugs.
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