Re: [SOLVED] Re: Grub2 editable floppy?

[Robert]

wangji wrote:
> Le lundi 14 novembre 2011 à 00:40 +0100, Robert a écrit :
> > wangji wrote:
> > > have a look
> > > at :https://sites.google.com/site/wjhowto/ext2-diskfile-for-grub2
> >
> > I first tried it simuliar with a trick to partition the floppy
> > image with partition 1 at 32K Start. .. "losetup -o32256
> > /dev/loop1 fd.img"
> > Once this worked somehow, but it was not really a usable rw
> > floppy, as a special mount is necessary. And I could not reproduce it.
> >
> > Now the script mk_fdb.sh below creates a legal editable rw vfat
> > floppy (image). Could be even edited easily on DOS/Windows.
> >
> >
> > (in Grub2 v1.99 there seems to be a bug with the new and required
> > option "-a" however. v1.98 is ok)
> >
> >
> > Robert
> > _______________________________________________
> > Help-grub mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/help-grub
>
> I could be wrong,but so far I understand grub-setup does not allow to
> use a no-partitioned-disk ,no matter what format is used.

there is just a warning regarding blocklists needing to be used. 
it works via  "--force" as shown in the script which I attached. 
blocklists are ok on a floppy. LILO uses nothing else. (Its when 
the core.img / kernel / initrd ... files are replaced, a new LILO 
or grub-setup whould be needed to recalc the blocklists)
With 1.98 everything works (just the USB modules are fatal buggy)

In Grub2 v1.99 grub-setup there is even a new switch "-a" 
regarding floppies.

Just with v1.99 here everything fails: legal plain floppy, 
paritioned floppy and --diet for iso floppies also disappeared :-( 
  Grub boots and then freezes after the 4 Letters "GRUB "
 why?




> The only way is to cheat by making use of another external bootloader
> as hpa's syslinux or extlinux like examples given in :
>
> https://sites.google.com/site/playgrub2/home/pseudo-install-grub2-on-raw-diskfile-a-k-a-nopartitioning

this will probably fail because grub-install needs 2M+
I wonder about
"echo "(hd0) $loop" > mnt/boot/grub/device.map"
and "--grub-mkdevicemap=/boot/grub/device.map" :  Is this used at 
install time (how?), at stage 0, 1 , 2 boot?


Robert