POST(power on self test)
Performs a check on all internal components (Leng Heng )
Power On Self Test (or POST) is startup software on the motherboard BIOS. It performs a basic test of the individual hardware components such as the motherboard, RAM memory chips, keyboard, floppy drive and hard drive to ensure that everything is working properly. When a computer is turned on with the power switch (or cold boot), BIOS executes POST.
The BIOS communicates erros druing POST By giving a beep code.
post
post
The POST runs
BIOS reads the MBR.
BIOS is checked during POST procedure which a PC passes each time when powered on. If POST fails, a PC user will be presented with series of beeps, sequences of which indicates a problem detected with BIOS itself or with a PC hardware.
basic input/output system (BIOS)
the nurse on duty
Many parts of the Linux kernel do call the BIOS after POST, including the framebuffer and the APM/ACPI drivers. Most modern operating systems do not rely solely on the BIOS to support devices because interacting with them directly is usually faster, and bugs in the bIOS can be worked around.