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Android Boot Process
When switching off the power of the Android device and switch on it again, this process is known as the Android Booting sequence.
Above Image showing 5 stages of Booting process for an Android-powered device:
- 1st Stage is Boot ROM and Boot Loader
- 2nd Stage is Kernel
- 3rd Stage is Init
- 4th Stage is Zygote and DVM
- 5th Stage is SystemServer and Managers
Boot ROM and Boot Loader
On pressing the POWER button, the Boot ROM code starts executing from a predefined location which is hardwired in ROM. It loads the Bootloader into RAM. The bootloader is code that is executed before any Operating System starts to run. The bootloader is a low-level code contains the instructions that tell a device how to start up and find the system kernel. The bootloader usually lives on the system board in non-volatile memory and is often specific to a device.
The bootloader is usually split into stages. Primary Boot Loader and Secondary Boot Loader. The bootloader can be found at:
<android source>/bootable/bootloader/legacy/usbloader
