Re: How to use grub-mkimage prefix?

[J. Eppler]

On 11/01/2016 01:35 PM, Andrei Borzenkov wrote:
> 01.11.2016 19:39, J. Eppler пишет:
>> Hello,
>>
>> I use the following command to create a grub image:
>>
>> ~~~
>> ./grub-mkimage --verbose --output=out/grubaa64.efi
> grub-mkimage is internal tool that is not intended to be used directly
> for day to day grub installations. What are you trying to do and why
> provided tools (grub-install, grub-mkstandalone and several others) are
> not enough?
What I try to do is cross-compile Grub2 for arm64 (also called aarch64)
for the HiKey board. I use a x86_64 virtual machine running Debian
"Stretch" (Testing) on my Laptop to cross-compile Grub2.

I use grub-mkimage, because the developer from the HiKey board gave me
some instructions (see:
http://www.96boards.org/forums/topic/grub2-cant-find-command-multiboot-and-module/#post-16820).
I try to adjust the instructions to my own needs, but have little to no
experience with the Grub2 commands, such as grub-mkstandalone. In short
I am happy about every advice, hint and help I can get.

>> --config=out/grub.configfile --format=arm64-efi $GRUB_MODULES
>> Prefix not specified (use the -p option).
>> Usage: ./grub-mkimage [OPTION...] [OPTION]
>> ~~~
>>
>> I get the message: "prefix not specified". My problem is that I do not
>> understand what the prefix directory should be. The man page
>> `grub-mkimage` for the -p option only says: "set prefix directory". It
>> does not explain what a prefix directory value could be nor does it
>> explain the function of the prefix directory.
>>
> Prefix is location of /boot/grub from grub point of view. Normally all
> other modules and configuration files are searched for relative to
> $prefix. grub always needs to know $prefix value which is why it is
> mandatory.
>
>> ---
>>
>> Appendix
>>
>> config file:
>>
>> ~~~
>> $ cat out/grub.configfile
>> search.fs_label rootfs root
>> set prefix=($root)'/boot/grub'
>> configfile $prefix/grub.cfg
>> ~~~
>>
>> grub modules:
>>
>> ~~~
>> GRUB_MODULES="boot chain configfile echo efinet eval ext2 fat font
>> gettext gfxterm gzio help linux loadenv lsefi normal part_gpt part_msdos
>> read regexp search search_fs_file search_fs_uuid search_label terminal
>> terminfo test tftp time xen_boot"
>> ~~~
>>
>> best regards
>>   J. Eppler
>>
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