Re: Force location of GRUB's boot and core images ?

[Pascal Hambourg]

Le 09/04/2017 à 10:52, Andrei Borzenkov a écrit :
> 09.04.2017 11:14, Pascal Hambourg пишет:
> > In some cases I would need to force installation of GRUB's boot and core
> > images into a specific location on the drive instead of letting
> > grub-install decide automatically.
> >
> > For example :
> > - install the boot image in the first sector of an unformatted partition
> > - install the core image in the second and next sectors of that partition.
> >
> > Is this possible through any undocumented options or internal commands ?
>
> No. The most straightforward workaround is to create loop device on top
> of partition and create partition table inside with at least one
> partition and suitable post-MBR gap. Then you will be able to install on
> /dev/loopX. You may zap partition table afterwards to avoid confusion.

Thanks for your answer. I did not think that GRUB would support 
installing on a virtual device such as a loop device.

I just tried it. grub-install executed without any error, but 
chainloading the partition boot sector leaves me with a blank screen 
after the "boot" command. bootinfoscript reports that grub2 is installed 
in the boot sector of the partition and looks at sector 1 of the same 
hard disk (which contains the GPT header) for core.img. I guess that 
proper booting would require that the boot image looks at the partition 
offset+1 instead.