root file sys location to kernel

Hello,

I have created partions for the NAND flash, and have placed the yaffs2 file
system in to the file sys. partion.

The root file system location is send as command line argument root = xyz

Can anyone tell me how this information (file sys location) is recognized
by the linux kernel, as the partion table is created by the bootloader. 

i.e  for example "root=/dev/mtd2" is the commandline parameter. then how
kernel recognises the file sys location is in nand flash, at that
particular address/partion?

What are the things to be taken care here?

Thanks in advance!

Regards, 
Srinivas.

This is a question I have for a few days too. I still don't have exact
answer yet. 

But you are right, the bootloader creates the partitions either by startup
scripts or command line. And then the partition information is somehow
passed over to the kernel. There seem to be a few methods available to do
this. I assume one of them is by a driver like layer of software.

Once the kernel have these information, it will instantiate these
partitions, create kernel data structures representing them, and then the
partitions got their names in /dev dir. From there the partitions are
visible.

Where are these driver(s) are located? How do they work? How the
information is passed over? I don't know yet ... There seem to be some
board specific setup code involved.