The Android operating system developed by Google become one of the most popular OS in the world which is used in mobile phones,tablets, net books,televisions, set-top boxes, and even automobiles.The Android OS is open source and incorporates enterprise requirements, such as exchange support, remote wipe, and Virtual Private Network (VPN) support etc.Device diversity, quick adaptation and multiprocessing support helped Android grow fast.Android is an embedded OS that relies on the Linux kernel for core system services,but it is not embedded Linux.Android not supported standard Linux utilities such as X-windows and GNU C libraries etc.Writing applications for Android utilizes the Java framework, but it is not Java. Standard Java libraries such as Swing are not supported.Other libraries such as Timer have been replaced by Android’s own libraries, which are optimized for usage in a resource constrained,embedded environment.
The Android OS is organized into the following images:
Boot loader—Initiates loading of the boot image during start up
Boot image—Kernel and RAM disk
System image—Android operating system platform and apps
Data image—User data saved across power cycles
Recovery image—Files used for rebuilding or updating the system
Radio image—Files of the radio stack
These images are stored on nonvolatile flash memory, so they are protected when the device powers down.The flash memory is used like read-only memory , but can it be rewritten as necessary. On start up, the microprocessor executes the boot loader to load the kernel and RAM disk to RAM for quick access.The microprocessor then executes instructions and pages portions of the system and data images into RAM as needed.The radio image resides on the base band processor, which connects to the radio hardware.
The Android OS is organized into the following images:
Boot loader—Initiates loading of the boot image during start up
Boot image—Kernel and RAM disk
System image—Android operating system platform and apps
Data image—User data saved across power cycles
Recovery image—Files used for rebuilding or updating the system
Radio image—Files of the radio stack
These images are stored on nonvolatile flash memory, so they are protected when the device powers down.The flash memory is used like read-only memory , but can it be rewritten as necessary. On start up, the microprocessor executes the boot loader to load the kernel and RAM disk to RAM for quick access.The microprocessor then executes instructions and pages portions of the system and data images into RAM as needed.The radio image resides on the base band processor, which connects to the radio hardware.
No comments:
Post a Comment