Bios , Mbr, Grub

[Gnoleba GNOGBO]

Hi !

Thanks for your answears.
Can you give le the link where i can find "Understanding the linux system
startup " please ?
Regards

Gnoleba
Le 6 juil. 2016 04:00, "arshad hussain" <arshad.super at gmail.com> a écrit :

>
> > On 04-Jul-2016, at 2:30 pm, Gnoleba GNOGBO <gnognoleba at gmail.com> 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 exécution ?
>
> 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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>
>
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