On the following webpage, http://processors.wiki.ti.com/index.php/Booting_Linux_kernel_using_U-Boot, the following statement is made:
"In the above commands 'X' in '/dev/mtdX' and '/dev/mtdblockX' refer to the NAND partition which is reserved for file system."
Where are /dev/mtdX and /dev/mtdblockX defined?