Re: Multiple boot from USB stick

[hoan]

Mystery over mystery

this comes very probably from misunderstanding about the
"iso-scan="  "boot_from $iso" found in most liveiso grub.cfg.
They are not parsed by grub but by "linuxrc/casper or similar init 
script" at boot ,so they really depend on the distro's build !
and have nothing to do with grub.
HTH

A few fun exercises on grub :
 grub2_playground
https://sites.google.com/site/wjhowto/grub2-svn1725-playground
https://sites.google.com/site/wjhowto/ext2-diskfile-for-grub2
play grub2
https://sites.google.com/site/playgrub2/home

grugefi_K.I.S.S Keep_It_Simple_Stupid
https://sites.google.com/site/grubefikiss/grubefi-and-multiboot

On 02/14/2016 03:22 PM, Karsten Malcher wrote:
> Am 14.02.2016 um 12:41 schrieb Y.:
> > Le 2016-02-13 18:28, Karsten Malcher a écrit :
> > > i want to setup an USB stick that is able to boot different OS form ISO.
> > Here's an example of Grub2 booting an ISO file:
> > http://yalis.fr/cms/index.php/post/2013/05/09/Bootable-flash-drive-for-both-Linux-and-Windows%3A-part-2
> >
> > Cheers
> I could try out some things of this article.
> Some work other not.
>
> There are some things that cannot be find in the documentation, but they work!
>
> -------------------------------------------------
>
> I tried to start the BIOS updater now this way, it seems to start and fail:
>
> menuentry "BIOS update chainloader" {
>          set root=(hd0,1)
>          chainloader --force /boot/img/BIOS.img
> }
>
> Disk I/O Error
>
> -------------------------------------------------
>
> I can't understand why this is working?
> The loopback is missing but it is working!
>
> menuentry "HDT: Check hardware" {
>          linux16 /boot/img/MEMDISK iso
>          initrd16 /boot/iso/hdt-0.5.2.iso
> }
>
> -------------------------------------------------
>
> Knoppix can be booted this way without problems.
> But why it works with bootfrom = /dev/sda1 ?
>
> menuentry "Knoppix 7.2.0 ISO" {
>          set isofile="/boot/iso/KNOPPIX-ADRIANE_V7.2.0gCD-2013-07-28-DE.iso"
>          loopback loop (hd0,1)$isofile
>          linux (loop)/boot/isolinux/linux bootfrom=/dev/sda1$isofile acpi=off 
> keyboard=de language-de
>          initrd (loop)/boot/isolinux/minirt.gz
> }
>
>
> -------------------------------------------------
>
> Mystery over mystery ...
>
> Cheers
> Karsten
>
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