What role during Fastboot Android Brush and Recovery is?
In an answer to his own knowledge of almost ,, now turned out into the blog, I hope more people can answer the doubts, or there is an error in understanding what users look also pointed out -
Today, just and colleagues discuss the next Fastboot. Question in my opinion should first understand what role Fastboot and Recovery Android system, we go to discuss their role in the process of Brush.
First of all the functions it Fastboot, Fastboot two generally by boot and loader modules, responsible for initializing boot some basic parameters Andrews electrical device, similar to the CPU clock registers are initialized. The loader is responsible to guide the system, such as how much space from the Emmc read into memory and CPU starts executing from a start address memory, in fact, Android Or Recovery module is loaded in this step.
The Recovery is actually a mini system, and Fastboot on the loader, the Android and Recovery is the same level, boot time, you can go loader to load any one of them, you may only have understood Recovery is a recovery the factory and upgrade functions of the system, pay attention to Fastboot we generally do not think it is a system. But it has some functional modules and other similar tftp.
So Android Brush when using Fastboot usually line the brush, that is, brush machine software on the PC through and Fastboot communication, the Brush package on a PC via a bridge Fastboot, and written to the EMMC Android devices, and Recovcey upgrade general we are talking about the brush card, which is responsible for reading SD card upgrade package to upgrade, in fact, at this point we know Recovery is supported by the file system, it can go to read the file in the SD card, while Fastboot is generally not It has such a function.
Finally, the last, to answer the question asker
Android Fastboot by the action of the brush is switched >>> Fastboot initialization hardware environment, minimal system, and communications software and a brush on the PC, the PC on the Brush package written to Emmc, the brush implement. Recovery does not work this time.
Recovery Android by the action of the brush >>> Fastboot boot initialization hardware environment, minimal system, and then start the boot Recovery, Data Recovery upgrade package is read, the data is written to the update package Emmc. In this way, Fastboot Recovery and have played their respective functions.
from：https://www.cnblogs.com/Onlyou/p/7979317.html