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    SubjectRe: Which device did I boot from?
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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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