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Re: [grub] Experiencing difficulties to access USB key files

From: Arbiel (gmx)
Subject: Re: [grub] Experiencing difficulties to access USB key files
Date: Sun, 24 Jan 2016 22:09:28 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0


So, I understand nativedisk or installing grub with --disk-module=native
will bypass BIOS and have grub access the hardware using its own
drivers, which I won't have to insert with insmod commands.

It failed as shown at the end of the message

Le 23/01/2016 13:08, Andrei Borzenkov a écrit :
> 23.01.2016 14:39, Arbiel (gmx) пишет:
>>> But GRUB does not have driver to access this hard disk anymore. Current
>>> GRUB disables BIOS access as soon as these modules are loaded. If you
>>> want to test them, please always use "nativedisk" GRUB command which
>>> attempts to replace device name in $prefix and $root with new one,
>>> discovered by native drivers.
>>> Old GRUB may not have this command though.
>> Do you mean that "hd0,msdos1" and so on, are sort of symbols for
>> information understood by the BIOS that grub own drivers do not understand ?
> hd0 refers to disk accessible via BIOS. USB mass storage accessible
> directly using USB drivers would be name usb0 (or whatever running
> number). Command "nativedisk" attempts to find and replace new device
> names in $root and $prefix.
>> In short statement, I cannot have grub using its own drivers without
>> writing a whole new application and I have to drop the idea of accessing
>> any file on a USB drive if the BIOS itself does not encompass USB drivers.
> Not sure I understand what you mean. You can replace drivers online
> using "nativedisk" command or you can even install GRUB using
> grub-install --disk-module=native.
My PC is a BIOS plateforme.

env LANG=all sudo grub-install -V
grub-install (GRUB) 2.02~beta2-9ubuntu1.4

I got a program error :

env LANG=all sudo grub-install --boot-directory=/mnt/boot
--disk-module=native /dev/sdd
grub-install: --disk-module: (PROGRAM ERROR) Option should have been
Try 'grub-install --help' or 'grub-install --usage' for more information.
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