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Re: [Libreboot] Detection of drives with x200 ultrabase

From: Daniel Tarrero
Subject: Re: [Libreboot] Detection of drives with x200 ultrabase
Date: Thu, 28 Jan 2016 12:06:37 +0100


maybe it has something to do with the "mapping of drives".

i read in grub's manual:

Historically, the device map file was used because GRUB device names had
to be used in the configuration file, and they were derived from BIOS
drive numbers. [[[[ The map between BIOS drives and OS devices cannot
always be guessed correctly: for example, GRUB will get the order wrong
if you exchange the boot sequence between IDE and SCSI in your BIOS.

Unfortunately, [[[[ even OS device names are not always stable ]]]].
Modern versions of the Linux kernel may probe drives in a different
order from boot to boot, and the prefix (/dev/hd* versus /dev/sd*) may
change depending on the driver subsystem in use. As a result, the device
map file required frequent editing on some systems.

[[[[ GRUB avoids this problem nowadays by using UUIDs ]]]] or file
system labels when generating grub.cfg, and we advise that you do the
same for any custom menu entries you write. If the device map file does
not exist, then the GRUB utilities will assume a temporary device map on
the fly. This is often good enough, particularly in the common case of
single-disk systems.

However, the device map file is not entirely obsolete yet, and it is
used for overriding when current environment is different from the one
on boot. Most common case is if you use a partition or logical volume as
a disk for virtual machine. You can put any comments in the file if
needed, as the GRUB utilities assume that a line is just a comment if
the first character is ‘#’.

Maybe interesting for you too:

are you using UUID's?


El mié, 27-01-2016 a las 22:51 +0100, Louis Delmas escribió:
> Hi,
> My system is a x200 with libreboot 20150518 (encrypted ssd)
> I use a dock (x200 ultrabase) with an additionnal HDD which is also
> encrypted.
> My problem is that when I boot (after a shutdown) the password for the
> hdd (in the doc) is asked first, and then grub does not find the ssd
> (in the thinkpad). So the system cannot start.
> Then, if I reboot from grub command line, the password for the
> hdd (in the dock) is still asked first and then grub finds the ssd (in
> the thinkpad). I enter the password and the system boots.
> So in order to boot I have to start the computer one time, just to do a
> reboot in order for grub to find both drives.
> I use "cryptomount -a", I tried putting the name of the ssd but it is
> still undetected on the first boot.
> Do you have an idea how to get grub to detect both drives at once after
> a shutdown ?
> If I start without the dock, then everythink is fine.
> Cheers
> Louis

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