for every one has this problem:
you have to give a boot flag to your partition ,you can do this with fdisk 
command :

fdisk  /dev/sda
Command (m for help): m

Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): a
Partition number (1-5): 

On Wednesday, November 25, 2015 at 11:00:34 AM UTC+3:30, Madhukar Sah wrote:
> I have beaglebone black element14 board. My board is booting perfectly 
> fine from eMMC. I want to boot it via SD CARD  so downloaded the uboot fron 
> denx site, compiled and generated the *MLO* and *uboot* image 
> file.Followed the procedure of portioning the SD CARD into fat32 and ext4 
> and copied the the MLO and *u-boot.img* file using the *cp* command to 
> the fat32 partition.
> I followed the prescribed mechanism of pressing the S2 push button before 
> applying the power(*I am only using USB for purpose of power and no 
> external power*). But after connecting the USB , the boards power LED 
> glows but nothing appears on the console. The console cable is working as 
> when i was booting from eMMC, i used to get debug messages on the console.
> I read somewhere that i need to change the MLO file name in the eMMC.I did 
> and now it is neither booting from eMMC nor from the SD card.
> Request help please.
> I 

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