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Boot Process
The four stages of the Boot Process
| Question | Answer |
|---|---|
| BIOS Stage 1: When power is supplied to the processor: | The processor is hard-coded to look at a special memory address for code to execute |
| BIOS Stage 1: The MEMORY address contains: | A pointer or jump program that instructs the processor to find the BIOS program |
| BIOS Stage 1: The processor loads the BIOS program - the first BIOS program to run is: | Power-On-Self_test (POST) |
| BIOS Stage: 1 If POST is successful, then BIOS identifies other system devices using CMOS settings and info supplied by devices themselves: | Plug and play devices are allocated system resources - displays info about keyboard, mouse, and IDE drives in the system - then info about devices and system resources are displayed |
| BIOS Stage 1: The BIOS then searches for a boot sector using the BOOT ORDER in the: | CMOS |
| Boot Loader Stage 2: BIOS searches the boot sector for a | Master Boot Record (MBR) |
| Boot Loader Stage 2: BIOS loads the ----- code form the MBR | Primary boot loader |
| Boot Loader Stage 2: The PRIMARY boot loader does one of the following: | 1. Examines the partition table marked as bootable - loads the boot sector from that partition which contains a SECONDARY boot-loader that locates the OS kernel 2. Locates an OS kernel directly |
| Boot Loader Stage 2: When the SECONDARY boot loader is in RAM and executing: | A Splash screen is commonly displayed and an optional INITIAL RAM DISK (initd image) is loaded into memory |
| Boot Loader Stage 2: The initd image has | Root permissions and can be used to access the ACTUAL /root filesystem regardless of whether it exists on the local computer or an external device |
| Boot Loader Stage 2: The initd image is used to: | Mount the ACTUAL filesystem and load the kernel into RAM |
| Boot Loader Stage 2: With the images ready the secondary boot loader invokes the: | Kernel Image and the kernel takes over |
| OS Kernel Stage 3: The KERNEL resides in the: | /boot directory |
| OS Kernel Stage 3: The kernel initializes the: | hardware on the system |
| OS Kernel Stage 3: The kernel locates and loads the: | linuxrc program which configures the OS |
| OS Kernel Stage 3: The kernel dismounts and erases the | RAM disk image (initd image) |
| OS Kernel Stage 3: The kernel looks for: | Hardware and loads the DRIVERS |
| OS Kernel Stage 3: The kennel mounts the: | root partiton |
| OS Kernel Stage 3: The kernel loads and executes the: | initial (init) proccess |
| init Stage 4: by default the initial (init) process is | /sbin/init |
| init Stage 4: If /sbin/init is the initial process the kernel reads a file called: | /etc/inittab to determine what other programs to run |
| init Stage 4: /etc/inittab determines what other programs to run, such as: | Scripts to mount partitions or start services known as DAEMONS |
| init Stage 4: /etc/inittab determines what other programs to run, such as a: | console for a LOGIN |
| init Stage 4: /etc/inittab determines what other programs to run, such as an: | X Display Manager (XDM) for a GRAPHICAL login |
| Because it is the first process to run on the system, the initial program (init) is assigneds a: | Process ID of 1 |
Created by:
johnadream
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