[syslinux] Multiboot flash from 2 iso's

Alexander Pletnev pletnev.rusalex at gmail.com
Mon Nov 28 05:24:55 PST 2011

Thanks for your answer Emilio. 

Can you provide an example of using isohybrid ? 

On Mon, Nov 28, 2011 at 12:18:20AM -0430, Emilio Lazo Zaia wrote:
> Hello
> I'll write a HOWTO about this topic.
> My method is: GPT disklabel, extlinux/syslinux on first partition,
> make it bootable and make a nice menu to chainload all distros you
> want in your stick. Later you need to make hybrid all your iso files
> (with isohybrid.pl) and assign one partition in your GPT schema for
> each iso file (with the corresponding size depending on the .iso you
> will dump), and dump each iso onto these newly created partitions.
> That's it!
> As you have all your images dumped like original iso files, you will
> not lose the original menu and splash screen for each distro!
> Also because all filesystems are iso9660, each distro will mount its
> partition read-only, so all these distros inside your pendrive will
> never be modified with its use.
> You may need to modify something, i.e. change isolinux-debug.bin to
> isolinux.bin if the distro comes with the "debug" version of
> isolinux (this debug version doesn't supports hybrid booting). Also
> sometimes you may need to modify the initrd file, for example in the
> case of two Ubuntu-based distros because all them will search for
> the same /casper folder (or /live or whatever) and the first
> occurrence of this directory will match for all Ubuntu-based distros
> on your stick. The solution is make a symlink:
> /live -> /live-gparted
> ...and modify initrd's init script to search for /live-gparted. As
> far as I can remember:
> LIVE_MEDIA_PATH=live-gpartrd
> in scripts/live inside the initrd image.
> I did select GPT disklabel because its advantages over MBR. I did
> test it with 12 distros on an 8GB stick.
> On 11/27/2011 12:02 PM, Alexander Pletnev wrote:
> >Hello,
> >
> >Im trying to learn syslinux and want to create a multiboot flashdrive, which will have more than one liveCD available for booting.
> >
> >I've installed a simple live cd (secure linux live cd disk#1) to my Fat32 partition. It boots well. Now i want to add another live CD (geexbox disk#2) to boot from the same Fat32 partition.
> >
> >I need to copy some files from live cd (geexbox) and add them to my current live cd installation on Fat32 partition.
> >
> >This is a part of default config from disk#2 wich is used for default burning.
> >
> >label ubnentry0
> >menu label Start GeeXboX ...
> >kernel /vmlinuz
> >append initrd=/initrd vga=789 persistent quiet splash loglevel=3
> >
> >I tried to copy vmlinux and initrd files to a sub folder on disk#1 add config options to disk#1 syslinux.cfg with subfolders in path's to kernel and initrd script. But it won't work. Error was (can't find a correct root filesystem) . On disk#2 there is a file with name "rootfs" and size 64Mb, i think it's what i need. But i don't know how to add an option to syslinux config, about rootfs in a file.
> >
> >Can anybody understand and maybe help me?
> >
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