Booting from eMMC?

AndyCap

Hi Guys,

I have used dd to copy the partitions .

I can mount mmcblk1p1 and mmcblk1p2, files look good.

But when I remove the card and power cycle it won't boot, I get the PWR light but nothing else.

Anyone got any ideas?

Andy

giuliomoro

It occurs to me just now that whatever I suggested in the other thread was probably wrong. The right way is instead

/boot/uboot/tools/scripts/beaglebone-black-copy-microSD-to-eMMC.sh

This does something more sophisticated than dd (I guess this is required because dd would not work fine with a mounted source disk).
Note that you may have to do this before:

umount /dev/mmcblk0p1 && mount /dev/mmcblk0p1

in case /dev/mmcblk0p1 was mounted as read-only

apologies for the previous misleading post. Fixed the wiki as well.

AndyCap

Super, that works perfectly now.

Did a quick benchmark of the two reading from /dev/zero and writing to a file using dd with 8K blocks:

Supplied Card : 4.4 MB/sec
eMMC : 11.3MB/sec

Originally I was going to use the eMMC as a get out of jail while I mess with the Kernel, might make it the other way around now!