[U-Boot] mtd partition &kernel

[Fundu]

does the kernel know about different mtd partition from the boot loader? 

How do I go about creating a new mtd partition say /var/logs.

I'm using a mini2440 board which has 4 mtd partition 
uboot 
uboot-env
kernel
rootfs

I want to add another one, how do I go about doing that? 

TIA