Write on nand

[lp4u at inwind.it]

Hi,   
   
finally my board detect the NAND. How to use MTD? How to write, read on my NAND?   
Can I write on:   
0x00000000-0x00004000 : "Boot Agent"   
mtd: Giving out device 0 to Boot Agent   
0x00004000-0x00400000 : "/boot"   
mtd: Giving out device 1 to /boot   
 
Or I can write only on: 
0x00400000-0x04000000 : "user"   
mtd: Giving out device 2 to user   
 
Thanks, 
Lorenzo