|
Android Boot
The booting process of Android (operating system), Android devices starts at the power-on of the SoC (system on a chip) and ends at the visibility of the home screen, or special modes like Android recovery mode, recovery and fastboot. The boot process of devices that run Android is influenced by the firmware design of the SoC manufacturers. Background As of 2018, 90% of the SoCs of the Android market are supplied by either Qualcomm, Samsung Electronics, Samsung or MediaTek. Other vendors include Rockchip, Marvell Technology, Inc., Marvell, Nvidia and previously Texas Instruments. History Verified boot, a Booting#Measures, booting security measure, was introduced with Android KitKat. Stages Primary Bootloader The Primary Bootloader (PBL), which is stored in the Boot ROM is the first stage of the boot process. This code is written by the chipset manufacturer. The PBL verifies the authenticity of the next stage. On Samsung smartphones, the Samsung Secure Boot Key (SSBK) i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Booting
In computing, booting is the process of starting a computer as initiated via Computer hardware, hardware such as a physical button on the computer or by a software command. After it is switched on, a computer's central processing unit (CPU) has no software in its main memory, so some process must load software into memory before it can be executed. This may be done by hardware or firmware in the CPU, or by a separate processor in the computer system. On some systems a power-on reset (POR) does not initiate booting and the operator must initiate booting after POR completes. IBM uses the term Initial Program Load (IPL) on someE.g., System/360 through IBM Z, RS/6000 and System/38 through IBM Power Systems product lines. Restarting a computer also is called Reboot (computing), ''rebooting'', which can be "hard", e.g. after electrical power to the CPU is switched from off to on, or "soft", where the power is not cut. On some systems, a soft boot may optionally clear RAM to zero. Bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
