Oh, one thing to note. One might want to identify the correct storage to do further stuff from this...
(ie: find the eMMC or the storage card).

As noted in other threads (rootfs on emmc), N900 swaps mmcblk0 and mmcblk1 at some point after preinit.

The solution I did was to use sfdisk -l, coupled with some greps, etc, to identify the partition (in a very flaky way, by looking at count of cylinders).
I noted that both eMMC & SD use the same kernel drivers... hence trying to identify them by hardware type proved a bit difficult.
Didn't try too hard to find other ways yet.

Options I can think of offhand to identify the storage are:
- lshal
- parameters of the device in /sys/block/mmcblk*
- probably some storage label tool.

kh