h-yamamo/Grub.md

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## Grub.md

      
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              Grub.md
            
          
    GRUB Legacy: Support over 2 TiB disk and GPT for debian grub package

The grub legacy (grub 0.97) supported LBA access, but since it was
processing in 32-bit, it could only access up to 2 TiB.
By applying patches of the reference site below,
it became accessible with 48-bit LBA and supported disks over 2 TiB.
However, it didn't support the 64bit feature of ext4,
so it couldn't access the recently created ext4 filesystem.
So I modified those patches based on the latest debian package
that supports the 64bit feature of ext4.
How to build


Required packages: packaging-dev, lzip /
Preparation: sudo apt-get build-dep grub

Debian 13 (trixie/sid)

(# in some directory)
git clone --depth 1 https://gist.github.com/h-yamamo/3556e57415541235f9c7c37a90642079
apt-get -d source grub
tar xf grub_0.97.orig.tar.gz
cd grub-0.97
tar xf ../grub_0.97-81.debian.tar.xz
tar xvf ../3556e57415541235f9c7c37a90642079/debian.tlz
(# you may edit debian/changelog and/or something others)
debuild -uc -us

Package installation

By executing the following command while connected to the Internet,
depends packages are also installed.
(Specify the deb file name with an absolute path or a relative path.)
For example, run with root privileges like this:
apt-get --no-install-recommends install ./grub-legacy_0.97-81+0~ext1_amd64.deb

If grub2 packages are installed, they will be removed.
Usage

Setup

Just installing the grub-legacy package does not set it up.
The easiest way to set it up is to run the following command on the running
debian OS.
Run with root privilege:
grub-install '(hd0)'

For GPT disk supported by this extension, it works as follows:


Embed stage1 image in the MBR (LBA 0) of the first disk.


For stage1_5 image, where to embed is determined by the following priorities.


BIOS boot partition (EF02) found within 2 TiB

　　Embed stage1_5 in the beginning of its partition.

First partition start after LBA 72

　　Embed stage1_5 after LBA 40.

Other then those above

　　Don't use stage1_5.

At boot time, /boot/grub/stage2 is finally executed.

References


Using grub http://hyamamo.s292.xrea.com/geo-bay-3897/grub/grub.html (Japanese)

　　(old URL: http://www.geocities.jp/bay3897/grub/
　　old old URL: http://www.geocities.co.jp/SiliconValley-Bay/3897/grub/)

GRUB Legacy - ArchWiki