Difference between revisions of "GRUB2"

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== Introduction ==
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'''[https://www.gnu.org/software/grub/grub.html GRUB2]''' is a modular, multiboot-capable bootloader for many operating systems that can be used as a payload for coreboot.
  
GRUB2 gives an ideal payload for coreboot. It's modular, extensible, supports booting off filesystems, and it has a scriptable shell. Our goal is to replace the common coreboot payload [[FILO]] with a coreboot-capable version of GRUB2.
 
  
 
== Status ==
 
== Status ==
  
Patrick Georgi has been working on GRUB2 for coreboot during the Google Summer of Code 2007. He made an [http://coreboot.org/~oxygene/lbgrub2-20070820-1.tar.bz2 original code submission] on August 20th 2007. Please read [http://coreboot.org/~oxygene/lbgrub2-instructions.txt GRUB2 on coreboot instructions] for information on how to use it.
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* The mainline version of GRUB2 has a [http://grub.enbug.org/CoreBoot wiki page on the coreboot port] (Update: no longer available)
 
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* Additional information about our former GRUB2 effort (which was part of Google Summer of Code 2007) can be found in the history of this page. Don't expect any link there to work.
This work was subsequently rejected by the GRUB project, and was eventually re-implemented by Robert Millan, one of the GRUB project members. The re-implementation lacks a couple of fundamental features. As of the time of this writing, it can not be loaded in coreboot v2.
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* As an alternative, you could consider using [[FILO]]. Both FILO and GRUB2 have various advantages and disadvantages. Which of the two is better suited depends on your requirements.
 
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* Yet another alternative is to not put GRUB into the BIOS ROM, but have it run from your disk as you would with a vendor BIOS. For that, you can use [[SeaBIOS]] as payload, which will then be able to run either GRUB1 or GRUB2 from your disk.
* A significant amount of work has been put into GRUB2 in our [http://www.coreboot.org:8889/ GRUB2 monotone repository]. A current snapshot of GRUB2 for coreboot can be downloaded via monotone or via the web frontend.
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* The mainline version of GRUB2 has a [http://grub.enbug.org/CoreBoot wiki page on the coreboot port]
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== Todo ==
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* Mainstream GRUB2's grub-mkimage needs to put the program headers right after the elf header [http://www.mail-archive.com/grub-devel@gnu.org/msg03547.html  (Fix available)].
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* USB stack integration (in progress)
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* See more information in the "[http://tracker.coreboot.org/trac/coreboot/milestone/Port%20GRUB2%20to%20coreboot Porting GRUB2  to coreboot]" milestone in the coreboot issue tracker.
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== How to build GRUB2 as a payload ==
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$ # build lbgrub2:
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$ # target/target_alias assume that you use i386-elf-gcc
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$ configure --with-platform=linuxbios --prefix=$PWD/installed
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$ make && make install
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$ $PWD/installed/bin/grub-mkimage -o core.img normal fat iso9660 ext2 pc atadisk rom lar ls cat cmp hello help serial terminal test configfile multiboot boot loopback
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== How to help? ==
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Contact [mailto:stepan@coresystems.de Stefan Reinauer], [mailto:oxygene@coresystems.de Patrick Georgi] or the [[Mailinglist|LinuxBIOS mailing list]] for more information.
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Revision as of 11:25, 1 June 2012

GRUB2 is a modular, multiboot-capable bootloader for many operating systems that can be used as a payload for coreboot.


Status

  • The mainline version of GRUB2 has a wiki page on the coreboot port (Update: no longer available)
  • Additional information about our former GRUB2 effort (which was part of Google Summer of Code 2007) can be found in the history of this page. Don't expect any link there to work.
  • As an alternative, you could consider using FILO. Both FILO and GRUB2 have various advantages and disadvantages. Which of the two is better suited depends on your requirements.
  • Yet another alternative is to not put GRUB into the BIOS ROM, but have it run from your disk as you would with a vendor BIOS. For that, you can use SeaBIOS as payload, which will then be able to run either GRUB1 or GRUB2 from your disk.