Preliminary instructions on writing u-boot, the linux kernel, and the root file system to the 256MB of onboard NAND Flash

It is recommended that you use the linux mtd utilities to write images to nand.

To do this you should first prepare a bootable microSD card.

Next, copy the image files and the below script to the microSD card (say to /home/root/images). You may need to modify the script to reflect the names of your image files. Make sure the script is marked as executable.

Unmount the microSD card from your development machine, insert it in the Overo microSD slot and boot.

Login and run the script.

dir=$PWD
uboot=u-boot-overo.bin
uimage=uImage-overo.bin
rootfs=omap3-desktop-image-overo.tar.bz2

if [ -e $uboot ]; then
  echo "Erasing u-boot partition ..."
  flash_eraseall /dev/mtd1
  echo "Erasing u-boot environment partition ..."
  flash_eraseall /dev/mtd2
  echo "Writing u-boot to NAND ..."
  nandwrite -p /dev/mtd1 $uboot
else
  echo "ERROR:  couldn't find u-boot binary"
fi

if [ -e $uimage ]; then                 
  echo "Erasing kernel partition ..."            
  flash_eraseall /dev/mtd3                       
  echo "Writing kernel to NAND ..."         
  nandwrite -p /dev/mtd3 $uimage
else                                             
  echo "ERROR:  couldn't find kernel binary"     
fi                                               
    
if [ -e $rootfs ]; then
  umount /dev/mtdblock4
  echo "Erasing and formatting rootfs partition ..."
  flash_eraseall -j /dev/mtd4
  echo "Mounting rootfs partition ..."
  mkdir -p /media/mtdblock4
  mount -t jffs2 /dev/mtdblock4 /media/mtdblock4
  cd /media/mtdblock4
  tar xjf $dir/$rootfs
  sync
else
  echo "ERROR:  couldn't find rootfs tarball"
fi