Re: How to prepare an ISO 9660 CD for booting via GRUB ?

[Vladimir 'φ-coder/phcoder' Serbinenko]

Thomas Schmitt wrote:
> 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 ?
>
>   
Right now it has nothing grub-specific. However I don't care much about
the exact name. Feel free to use whatever you want and I'll make the
adjustments in grub-mkrescue
> Shall the --efi* option have any influence on
> the BIOS boot stuff except the boot catalog ?
> (Default Entry, BIOS boot image, ...)
>
>   
No
> 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 \
>
>   
Thanks for the information. I'll look into it.
> 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
>
>
>
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>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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