Hi Venky,
If I am correct, you have connected your BBB USB host to Ubuntu 14.04 server
and USB Client to a USB eMMC card. Most likely reason might be that the 
partitioned are not formatted correctly. You can run $sudo fdisk -l by 
connecting
your USB eMMC card back to Ubuntu Linux machine and checking the partition
table and if required reformat it using $ sudo dd command. Finally, if 
problem is
in uboot then reply with exact uboot logs here for more info.

Thanks
manav mn

On Tuesday, 31 May 2016 15:08:09 UTC+5:30, Venky Venkatesh wrote:
>
> Hi andrey somov, 
> Thanks for responding to my question, actually my question is, i 
> wanted to boot my beagle bone black board from USB, not from eMMC or 
> SD card, for that i connected my board to the ubuntu 14.04. And i did 
> my USB stick into two partitions, one is for boot, another partition 
> is for root file system. And i copied my compiled images MLO, 
> u-boot.img, zImage, am335x-boneblack.dtb file to the /boot partition 
> and root file system to ext4 partition. 
> And my bbb is already having the u-boot, so it is booting and stuck in 
> u-boot command prompt, there i have used the usb commands and tried to 
> load the first partition, i.e usb part 0, but i got error message as 
> "Unknown partition table" 
> Can you suggest me the better way to boot my bealge bone black using USB 
>
> Thanks & Regards 
> Venkatesh 
>
> On Tue, May 31, 2016 at 2:42 PM, Andrey Somov <[email protected] 
> <javascript:>> wrote: 
> > Dear Venky, 
> > your question is very unclear and incomplete. 
> > I do not get what it mean "to boot from USB". 
> > 
> > Can you connect your board with the computer ? Is it Unix ? 
> > Do you see anything if you ssh to 192.168.7.2 ? 
> > 
> > Cheers, 
> > Andrey 
> > 
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