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Re: How to prepare an ISO 9660 CD for booting via GRUB ?
From: |
Thomas Schmitt |
Subject: |
Re: How to prepare an ISO 9660 CD for booting via GRUB ? |
Date: |
Sun, 18 Apr 2010 13:26:35 +0200 |
Hi,
> Ok, legacy :(. But --efi-boot would have no legacy.
--efi-boot will be all at your service. :))
The more definite your wishes, the more swift
their implementation.
Maybe we should call it --efi-grub-boot just
to make clear whom it cares for ?
Shall the --efi* option have any influence on
the BIOS boot stuff except the boot catalog ?
(Default Entry, BIOS boot image, ...)
> http://bzr.savannah.gnu.org/r/grub/people/phcoder/rescue-efi/
My bzr is too old for that. :(
It is from 2009. Hrmpf.
Is there a web interface to browse the source
for a first glimpse ?
> BIOS+EFI one should look like ...
Ok. I will start this in a few days.
Keep your test environment ready. :))
------------------------------------------------
xorriso-0.5.3 timestamp 2010.04.18.100814
allows to set LBA sorting weights.
Within the mkisofs emulation it is:
--sort-weight number ISO-path
If ISO-path is a directory, then its whole tree
is affected. --sort-weight can get overridden by
further --sort-weight options. They get applied
after all files are added to the image.
The boot catalog already has a hardcoded weight
of 1000 in libisofs. It cannot be influenced by
--sort-weight because it gets created after the
image manipulations are done.
The boot catalog of grub-mkrescue has no ISO-path
anyway (no option -c).
So in grub-mkrescue , this would give all files
weight 0, then override the /boot/grub tree by 1,
and the -b file by 2:
--sort-weight 0 / \
--sort-weight 1 /boot/grub \
--sort-weight 2 /boot/grub/i386-pc/eltorito.img \
After the image is written, xorriso can display
the data LBAs of regular files:
xorriso \
-indev image.iso \
-find / -sort_lba -exec report_lba -- \
2>/dev/null | less
yields:
Report layout: xt , Startlba , Blocks , Filesize , ISO image path
File data lba: 0 , 38 , 12 , 24317 ,
'/boot/grub/i386-pc/eltorito.img'
File data lba: 0 , 50 , 6 , 10564 ,
'/boot/grub/i386-pc/acpi.mod'
...
For the boot catalog LBA, one has to peek binary
(even if there was a ISO-path leading to it).
This reads the LBA word from El Torito record:
dd if=image.iso bs=1 skip=34887 count=4 \
2>/dev/null | od -x
yields LBA 37 (decimal)
0000000 0025 0000
(There is a mkisofs option -sort with a file as
argument where single files get a weight.
Wildcards are promised in mkisofs/README.sort.
For now i deem that rather unappealing.)
------------------------------------------------
I will now finish multi-session MBR handling and
release libisoburn-0.5.4.
Then begins the next development cycle with EFI,
adjustable boot catalog weight, ...
Have a nice day :)
Thomas
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, (continued)
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/04/10
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Thomas Schmitt, 2010/04/11
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/04/11
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Thomas Schmitt, 2010/04/11
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Colin Watson, 2010/04/11
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/04/17
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Thomas Schmitt, 2010/04/17
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/04/17
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Thomas Schmitt, 2010/04/17
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/04/17
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?,
Thomas Schmitt <=
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/04/24
- Re: How to prepare an ISO 9660 CD for booting via GRUB ?, Thomas Schmitt, 2010/04/18