[syslinux] can't boot isohybrid-ized image on CG2100

[Greg Forte]

Made an image with xorriso and it works like a champ.

Am I correct that the -isohybrid-mbr option is only available with -as 
mkisofs in effect?  If so, is there a technical reason for that?  seems 
kind of odd ... anyway, I was using mkisofs previously, so I just threw 
all the same options to xorriso plus the -isohybrid-mbr and 
-partition-offset options (which I had gleaned from the debian image 
referenced earlier in this thread - yay for image-making utilities that 
embed the command-line used to make the image in the image!)

-g

Thomas Schmitt wrote:
> Hi,
> 
>> That debian image works fine on the problem system.
> 
> Very good to know. This is the first occasion where the partition
> offset feature did more than just looking nice.
> 
> 
>>  I tried hacking my
>> image by hand similarly, no luck (didn't hang the box, but didn't boot
>> either), but I'm probably doing it wrong.
> 
> There is a complete second directory tree for partition 1
> with all block addresses reduced by 16 (= 32 kB).
> 
> 
>>  Will try building one with xorriso next.
> 
> See also
>   http://libburnia-project.org/wiki/PartitionOffset
> which shows how to derive an isohybrid image with partition offset
> from an isohybrid image made by mkisofs and isohybrid.pl.
> 
> 
> The following example is derived from the ISOLINUX wiki.
> For production of an isohybrid enabled image you need to find out
> the path of file isohdpfx.bin from the Syslinux installation.
> E.g. /usr/lib/syslinux/isohdpfx.bin
> 
>    xorriso -as mkisofs \
>            -o output.iso \
>            -b isolinux/isolinux.bin -c isolinux/boot.cat \
>            -no-emul-boot -boot-load-size 4 -boot-info-table \
>            -isohybrid-mbr /usr/lib/syslinux/isohdpfx.bin \
>            -partition_offset 16 \
>            ./CD_root
> 
> Make sure to use xorriso-1.0.4 in order to get the cylinder alignment
> that is prescribed for isohybrid.
> 
> 
> Have a nice day :)
> 
> Thomas
> 
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