armuser 
Hi, I use mini2440 with 256MB nand and uboot on it. Unfortunatelly I noticed problems with nand writing. I wanted to flash kernel and rootfilesystem on nand. I started from flashing uboot as was written in manuals. I created BBT, flashed uboot etc. Than I stored kernel at 0x60000 address and rootfilesystem at 0x560000. Problems started when I wanted to upgrade kernel or rootfs. After upgrading kernel at mentioned address rootfilesystem was not recognized. Flashing rootfilesystem corrupted kernel. I used u-boot-256M.bin from the download section. I used nand write or nand write.e. In both cases efect was the same. Do you have any idea? Jacek