If there is no separate BIOS or boot ROM then what part of the system is working when A: the phone is powered off and the battery is charging or dead and battery animation appears on screen?
And B: when the device first powers on and displays the OEM splash screen, and prepares to boot Android
BIOS is typically placed in a chip known as Read Only Memory(ROM) that comes with the computer. This ensures that the BIOS will always be available even if the hard disk is formatted or replaced. However, in many cases the content of the ROM is transferred to the RAM when the system is started. This is because the RAM allows quicker access as compared to the ROM. Copying of the content of the ROM to the RAM is known as shadowing
BIOS is the first program to run when the computer starts. It is a ROM chip (EEPROM chip) found on motherboards and is used for hardware initialization during the booting process. It is pre-installed in the computer system. When BIOS boots up the computer system, it checks if all of the components are in place and working, and then it loads the operating system into the computer’s RAM from the hard disk of the system.
Nowadays BIOS is written on flash memory, to ease the process of rewriting the BIOS chip, whenever needed.
.png)
0 टिप्पणियाँ