Re: Bios-Bootloader details
From: Damjan (gdamjan_at_gmail.com)
Date: 11/18/04
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Date: Thu, 18 Nov 2004 18:33:32 +0100
> In particular, where the BIOS finisies the POST and jumps to the
> predefined location where the bootloader code is executed. I believe while
> the BIOS is running the processor is configured in real mode. So when the
> bootloader code is executing, will the processor switch to protected
> mode?( i am not sure).
The linux kernel is started in real-mode... I even think there's some
initialization code that must be executed in real mode by the kernel before
it switches to protected mode.
> If the processor runs the bootloader in real mode
> then it can see only 1MB of RAM. In this case if the linux image is
> greater than 1MB how can it uncompress the image?
Probably by using tricks to access more than that. there were programs that
alowed real mode DOS programs to use more than 1mb.
> Could anyone give me some pointers about this execution ??
you should probably search for documentation of how lilo or grub work.
-- damjan
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