
1. ext4 format SD 
mv /ldvc.out /ldvc.out1
killall ldvc.out
umount /sd1/
mkfs.ext4 /dev/mmcblk1p1
mv /ldvc.out1 /ldvc.out
sync

2. clear enviroment telnet 
dd if=/dev/zero of=/dev/mmcblk2 bs=512 seek=8192 count=32
3. clear enviroment uboot 
mmc dev 2
mmc erase 2000 32

4. remove u-boot from linux 
dd if=/dev/zero of=/dev/mmcblk2 bs=1K seek=32 count=2000
5. remove u-boot from u-boot 
mmc dev 2
mmc erase 40 1000

 









