101.2 Boot thesystem1

Introduction
1. the kernel
  1. Main Component SO
  2. Loaded Bootloader
    1. BIOS
    2. Uefi
    3. customized to pass parameters to the kernel
      1. #Partiction of root
      2. Execution Mode SO
Bios
1. Program stored in a non-volatile memory chip attached to the motherboard,
2. is called firmware separate from the other storage devices
3. assumes that the first 440 bytes in the first storage device
4. the first stage of the bootloader (also called bootstrap).
5. The first 512 bytes of a storage device are named the MBR (Master Boot Record)
Step by Bios
1. 1.- The POST (power-on self-test) identify simple hardware failures
2. 2.- The BIOS activates the basic components to load the system
  1. Keyboard Video CD Usb
3. 3.- The BIOS loads the first stage of the bootloader from the MBR (1st 440Bytes)
  1. Bios Configuration Utility
4. 4.- The first stage of the bootloader calls the second stage of the bootloader
  1. boot options loading the kernel.
UEFI
1. Firmware identify partitions and read many filesystems
  1. Not Read MBR
2. EFI applications, that will be executed automatically or called from a boot menu.
  1. Bootloader
  2. Select SO
  3. Tools System Diagnostic or repair
3. FS Compatibles fat12 fat16 fat32
  1. The partition containing the EFI applications is called the EFI System Partition or just ESP
4. The UEFI standard also supports a feature called Secure Boot,
Step by UEFI
1. 1.- The POST to identify simple hardware failures
2. 2.- The UEFI activates the basic components to load the system
  1. Keyboard video cd usb
3. 3.- to execute the pre-defined EFI application stored in the ESP partition’s filesystem (NVRAM)
4. 4.- Load the kernel to start the operating system.

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101.2 Boot thesystem1

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