I see on the recent test images[1] that u-boot and MLO are handled 
differently than before[2].  You copy u-boot.img and MLO using:

dd if=MLO of=/dev/sdX count=1 seek=1 conv=notrunc bs=128k
dd if=u-boot.img of=/dev/sdX count=2 seek=1 conv=notrunc bs=384k


I want to try my own u-boot, but before overwriting working copy I'd like 
to back it up.  Does this work?

bone$ *dd if=/dev/mmcblk1boot1 of=u-boot.img.bak count=2 seek=1 bs=384k*
bone$ *dd if=/dev/mmcblk1boot0 of=MLO.bak count=1 seek=1 bs=128k*

When updating u-boot, do I also need to update MLO?

Can I update a running Bone with?

dd if=MLO of=/dev/*mmcblk1boot0* count=1 seek=1 conv=notrunc bs=128k
dd if=u-boot.img of=/dev/*mmcblk1boot1* count=2 seek=1 conv=notrunc bs=384k


Thanks...

--Mark

[1] http://rcn-ee.net/deb/testing/
[2] 
http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0#Boot_Partition_.28omap4.2B_.28am335x.29.29

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