If you want to flash MLO and u-boot to NAND, these are the u-boot commands you need to use
+Setting up the boot args
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mmc rescan
fatload mmc 0 82000000 MLO
nandecc hw
nand erase 0 80000
nand write 82000000 0 20000
nand write 82000000 20000 20000
nand write 82000000 40000 20000
nand write 82000000 60000 20000
fatload mmc 0 0x80200000 u-boot.bin
saveenv
boot


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mmc rescan
fatload mmc 0:1 0x80000000 uImage
setenv bootargs 'console=ttyO2,115200n8 root=/dev/mmcblk0p2 rw rootwait'
setenv bootcmd 'mmc rescan;fatload mmc 0 80300000 uImage;bootm 80300000'
saveenv
boot