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Re: GRUB2 Sparc

From: Marco Gerards
Subject: Re: GRUB2 Sparc
Date: Tue, 27 Sep 2005 10:51:14 +0200
User-agent: Gnus/5.1007 (Gnus v5.10.7) Emacs/21.3 (gnu/linux)

Bart Grantham <address@hidden> writes:

> Marco Gerards wrote:
>>>Specifically, how are you handling
>>>different filesystem structures in the boot sector?
>> On the PC the bootblock (512 bytes) load the GRUB kernel.  This is a
>> binary image with a maximum size of 32KB (IIRC).  This is loaded from
>> a fixed location and no filesystem specific code is involved.
> I suppose that the consequences of this are that filesystems that
> don't store the kernel contiguously (ie. compression, small-file
> consolidation tricks) on disk will be incompatible with GRUB2?  Don't
> get me wrong, I think it's a reasonable tradeoff, I just want to make
> sure I understand correctly.

On the PC GRUB is installed right after the MBR, there you have a
space of 32KB.  You could also store GRUB in some filesystems that
have reserved space for GRUB.  This is filesystem specific.

So GRUB is either installed in a reserved region related to the
partitioning layout or a reserved region related to the filesystem.

There is a third way, that is storing a block list.  In that case you
have very little space, just enough to store a block list.  In that
case GRUB can be stored inside the filesystem and GRUB is not stored
contiguously.  I think this is what lilo does.


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