Re: Which device did I boot from?

[Dallas Clement]

On Fri, 2007-06-22 at 05:41 -0500, Dallas Clement wrote:
> Can anyone tell me how to determine which device Linux booted from.  I
> am using GRUB to boot Linux.  My menu.lst config is this:
> 
> title           GNU/Linux, kernel 2.6.21.1
> root            (hd0,0)
> kernel          /boot/kernels/bzImage
> 
> Once booted from Linux, I would like to be able to tell which Linux
> device, i.e. /dev/hdx or /dev/sdx corresponds to hd0.
> 
> Is there a way to determine this?
> 
> Thanks!

For the benefit of anyone who cares, I found the answer to my problem.
It has been solved by some engineers over at Dell.  They created a
project called Enhanced Disk Drive services a.k.a EDD, which has been
incorporated into the 2.6 Linux kernel as the CONFIG_EDD option.

It worked marvelously for me.  You have to load the edd.ko module for it
to work.  It will then collect the BIOS drive info into
the /sys/firmware/edd folder.  The info concerning the boot device is
found in the int13_dev80 folder.  You can simply compare the cylinders
with the output of "fdisk -l" to determine the Linux partition name of
your boot device.

Regards,
Dallas