Re: Which device did I boot from?

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Saturday 15 April 2006 13:43, Rene Herman wrote:
> Andrey Borzenkov wrote:
> >> If you choose the (experimental) CONFIG_EDD option in your kernel then,
> >> with cooperation of your BIOS, you'll have a /sys/firmware/edd with at
> >> least some info about the BIOS boot device. For me:
> >
> > I am sorry but it does not tell about boot device. It contains all hard
> > disks enumerated via EDD interface. I do not see any information
> > under /sys/firmware/edd that would have allowed to guess boot device.
>
> int13_dev80 is the bootdevice. Or that used to be the case with things
> such as booting from SCSI at least. Don't know about booting from, say,
> USB.
>

OK. In this case udev creates links based on MBR signature; it can be used to 
infer real device:

{pts/0}% LC_ALL=C ll /dev/disk/by-id
lrwxrwxrwx  1 root root  9 Apr 12 21:36 edd-int13_dev80 -> ../../hda
lrwxrwxrwx  1 root root 10 Apr 12 21:36 edd-int13_dev80-part1 -> ../../hda1
lrwxrwxrwx  1 root root 10 Apr 12 21:36 edd-int13_dev80-part2 -> ../../hda2

Not sure about USB either.

- -andrey
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