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101.2 Boot thesystem1
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Primera Parte de 101.2 Boot the system
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primera parte de 101.2 boot the system
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Rolando Martinez
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Rolando Martinez
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Resource summary
101.2 Boot thesystem1
Introduction
the kernel
Main Component SO
Loaded Bootloader
BIOS
Uefi
customized to pass parameters to the kernel
#Partiction of root
Execution Mode SO
Bios
Program stored in a non-volatile memory chip attached to the motherboard,
is called firmware separate from the other storage devices
assumes that the first 440 bytes in the first storage device
the first stage of the bootloader (also called bootstrap).
The first 512 bytes of a storage device are named the MBR (Master Boot Record)
Step by Bios
1.- The POST (power-on self-test) identify simple hardware failures
2.- The BIOS activates the basic components to load the system
Keyboard Video CD Usb
3.- The BIOS loads the first stage of the bootloader from the MBR (1st 440Bytes)
Bios Configuration Utility
4.- The first stage of the bootloader calls the second stage of the bootloader
boot options loading the kernel.
UEFI
Firmware identify partitions and read many filesystems
Not Read MBR
EFI applications, that will be executed automatically or called from a boot menu.
Bootloader
Select SO
Tools System Diagnostic or repair
FS Compatibles fat12 fat16 fat32
The partition containing the EFI applications is called the EFI System Partition or just ESP
The UEFI standard also supports a feature called Secure Boot,
Step by UEFI
1.- The POST to identify simple hardware failures
2.- The UEFI activates the basic components to load the system
Keyboard video cd usb
3.- to execute the pre-defined EFI application stored in the ESP partition’s filesystem (NVRAM)
4.- Load the kernel to start the operating system.
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