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| == Status == | | == Status == |
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| * A significant amount of work has been put into GRUB2 in our [[Monotone Repository|monotone repository]], which also provides snapshots.
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| * The mainline version of GRUB2 has a [http://grub.enbug.org/CoreBoot wiki page on the coreboot port]. | | * The mainline version of GRUB2 has a [http://grub.enbug.org/CoreBoot wiki page on the coreboot port]. |
| * There is currently no significant work going on in our GRUB2 repository, not even synchronization to the upstream repository. If you require the additional features of our branch below, go ahead. Otherwise, upstream might serve you better. Or not. If you want to help out or report bugs for our branch, see [[GRUB2#How_to_help_and_report_bugs|How to help and report bugs]] | | * There is currently no significant work going on in our GRUB2 repository, not even synchronization to the upstream repository. If you require the additional features of our branch below, go ahead. Otherwise, upstream might serve you better. Or not. If you want to help out or report bugs for our branch, see [[GRUB2#How_to_help_and_report_bugs|How to help and report bugs]] |
| | | * Please consider using [[FILO]]. |
| == How to build GRUB2 as a payload ==
| | * 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. |
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| It's recommended to use a recent snapshot of the '''allpatches''' branch in the [[Monotone Repository|GRUB2 monotone repository]]. A snapshot is available at http://coresystems.de/~patrick/coreboot.org-grub2-20080731.tar.bz2
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| $ wget http://coresystems.de/~patrick/coreboot.org-grub2-20080731.tar.bz2
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| $ bzcat coreboot.org-grub2-20080731.tar.bz2 | tar xvf -
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| $ cd coreboot.org-grub2-20080731
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| $ sh autogen.sh
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| $ ./configure --with-platform=coreboot --prefix=$PWD/installed
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| $ chmod 755 mkinstalldirs
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| $ make && make install
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| $ $PWD/installed/bin/grub-mkimage -o core.img normal fat iso9660 pc ata memdisk lar ls cat cmp hello help serial terminal test configfile multiboot boot loopback
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| == GRUB2 modules ==
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| GRUB2 is a modular system, you can include whichever modules you need into the image.
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| In addition to the [http://grub.enbug.org/CommandList full list of available modules in upstream GRUB2] the coreboot version of GRUB2 also adds a few more custom modules.
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| === Suggested modules ===
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| We suggest that you use the following modules:
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| {| border="0" style="font-size: smaller" valign="top"
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| |- bgcolor="#6699dd"
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| ! align="left" | Modules
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| ! align="left" | Reason
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| |- bgcolor="#eeeeee" valign="top"
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| | serial, terminal, terminfo
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| | serial console support
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| |- bgcolor="#dddddd" valign="top"
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| | coreboot
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| | change to console automatically
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| |- bgcolor="#eeeeee" valign="top"
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| | digest
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| | crypto (incl. signature checking)
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| |- bgcolor="#dddddd" valign="top"
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| | memdisk, lar or cpio
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| | filesystem in rom
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| |}
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| During development, we used the following list of modules:
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| coreboot hello cat cmp fat iso9660 help lspci lsusb serial terminal lar terminfo memdisk atadisk ls
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| configfile boot hexdump digest linux multiboot pc
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| === Modules specific to coreboot ===
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| The following modules are specific to coreboot, or to the coreboot version of GRUB2:
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| {| border="0" style="font-size: smaller" valign="top"
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| |- bgcolor="#6699dd"
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| ! align="left" | Module name
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| ! align="left" | Description
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| |- bgcolor="#eeeeee" valign="top"
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| | atadisk
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| | ATA disk driver based on the OpenBIOS driver
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| |- bgcolor="#dddddd" valign="top"
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| | coreboot
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| | load serial console information from coreboot table
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| |- bgcolor="#eeeeee" valign="top"
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| | lar
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| | archive format ("filesystem") driver for LAR files (such as coreboot v3 images)
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| |- bgcolor="#dddddd" valign="top"
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| | lsusb
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| | in the .usb branch, provides an uhci driver and usb storage support. highly experimental at this time
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| |}
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| === Building a diskimage ===
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| If you are using coreboot v2, the firmware image is not a LAR archive, as in coreboot v3. If you want to place files in the coreboot+grub2 image, you can still create a diskimage and include it in your payload.
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| # create a lar/cpio/tar file (cpio must be gnu cpio. files created by other cpios might not be compatible)
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| # add <code>-m lar/cpio-file</code> to your grub-mkimage command line
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| Per default GRUB2 looks for a configuration file [http://grub.enbug.org/grub.cfg grub.cfg] in the disk image. The path is
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| (memdisk)/grub.cfg
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| == Checking Signatures ==
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| Currently the tools for crypto signature verification are not built automatically. To build them, run
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| $ cd libs/sigtools
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| $ make
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| === Using sigtools ===
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| Create a key pair filename.pub and filename.sec with
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| $ genkeypair filename
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| Create a signature of candidate using keyfile.sec and save it as candidate.sig:
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| $ gensig keyfile candidate
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| === Verification in GRUB2 ===
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| Load /key.pub as public key and block access to all unsigned files with
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| $ load-pubkey /key.pub
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| Verify foo using the signature foo.sig, reporting success or failure and grant access to the file foo with:
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| $ validate /foo /foo.sig
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| Example:
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| multiboot grub-invaders # fails
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| validate grub-invaders grub-invaders.sig
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| multiboot grub-invaders # this time it succeeds
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| == Hints and Tricks ==
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| === Loading grub.cfg from disk ===
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| It is suggested that grub.cfg is contained in a memdisk/lar image. This grub.cfg can be used to load other configuration files from any mass storage media. If you want to load a grub.cfg from the first device that contains one, your in-flash grub.cfg can look like this:
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| search -f -s /grub.cfg
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| configfile /grub.cfg
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| == To Do ==
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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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| == History ==
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| [[User:PatrickGeorgi|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. If you care, there is [http://coreboot.org/~oxygene/lbgrub2-instructions.txt documentation on how to use it], but that work is based on a very old version of GRUB2.
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| For various reasons, [[User:RobertMillan|Robert Millan]] of the GRUB project did another original implementation, which got merged, so we moved our effort to their new code base and continued from there.
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| == How to help and report bugs ==
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| Contact [mailto:stepan@coresystems.de Stefan Reinauer], [mailto:oxygene@coresystems.de Patrick Georgi] or the [[Mailinglist|coreboot mailing list]] for more information.
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