On my N8x0, I am booting from intFlash, mmc1/extSD and mmc2/intSD. I played with the system for awhile and made changes. I like my change and I would like to back it up. Now I have a problem: where did I booted from? I need to know, so that I would back it up to the 'other' slot.

Sometimes, when the ext2 partition are way different among them, I can kind of guess it out from the amount of space free from rootfs vs df . Say, in general they are 256Mb, 550 Mb and 650 Mb, the 256 Mb has to be intFlash boot, and the other two has a difference of 100 Mb, I can easily sort it out from df or cat /proc/partitions. Problem arise when both mmc1 and mmc2 are in the same range, say one is 560Mb and the other is 570Mb.

Is there any commands or utility or tricks to tell me where I boot from?
I tried to put something different in the background, but after several backup, it is no longer reliable.

Any thoughts?

TIA,

bun