6
System Startup: Installing and Booting the System
The diagram of the Android system, shown in Chapter 3 in Figure 3.1, is more than simply allegorical. It is meant to show, from the bottom to the top, dependencies within the Android system. The kernel creates an environment for applications; system applications and libraries create an environment for the Android system; and so on up to the top of the chain: Android user applications. Clearly, if each layer depends on the one beneath it, the components that comprise any given layer must be initialized before those in the layer above. The process of initializing the successive layers takes place at system startup when a device is booted. This chapter describes that process.
The Boot Process ...
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