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There are many warning messages while booting linux, after downloaded the jffs2 image to nandflash with flashtools1.6.

I have installed the Flashtool1.6 on my machine, then I make image of  jffs2 filesystem with the command "mkfs.jffs2 -lqnp -e 128 -r $HOME/filesystem -o jffs2_image_file.jffs2", and then use the flashtools to download the image to nandflash ,    When  first boot , it will run well and could rund the qtdemo . but when I reboot the device it will show a lot of  "mtd->read(0x814 bytes from 0x394ffec) returned ECC error",  sometime it can login in .  How I could get rid of those lot of messages of ECC?