On 04-Jul-2016, at 2:30 pm, Gnoleba GNOGBO [off-list ref] wrote:

Hi !

I had read a lot of book and link about initialization of the boot starting of linux.

I read that , after the post by the bios the mbr is loaded in memory which routine load this sector ?

This is architecture specific and is done by BIOS.

In this sector  of 512 bytes we have 440 bytes for a routine what is the function of this routine ?

Actually its 446 bytes. These are executable code.

16bytes per partition * 4 = 64bytes + (0xAA55) 2 bytes for MBR Marker = 66bytes

512 - 66 = 446 bytes

When this routine is executed ?

Just after POST. Done by BIOS.

The 2 bytes with 0xAA55 what is its function ?

Its denotes that the sector is executable. Can also be seen as Marker.

Who load it in memory ? And the all book i had read said the mbr load the loader grub How ? And the grub launch the kernel, ok . How this grub is load ? By which programm ? 
So, i would like that someone give me the names of routines, the order of their launching and which load or execute what until the grub ex?cution ?

I would suggest work it floppy on qemu/bochs first to understand then gradually 
move on to partition tables and boot loaders. 

Read ?Understanding the linux kernel? - System Startup chapter for thorough understanding.

Thanks.

Thank you for your help.
Greg i am waiting a lot from you !

Best regards
Gnoleba GNOGBO

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