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 > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/394e606e-e751-4eae-93c7-aa6c055870f1%40googlegroups.com.