On Fri, Dec 5, 2014 at 9:10 AM, Ricky Chang <[email protected]> wrote:
> Hi,
>
> I've just downloaded Robert Nelson's debian image of
>
> https://rcn-ee.net/deb/microsd/wheezy/bone-debian-7.7-console-armhf-2014-10-29-2gb.img.xz
>
> and flashed it to an SDcard. I discovered that there is no MLO or u-boot.img
> in the first partition. I thought that was ok since I understand that
> without pressing the boot button the system would look for the MLO and the
> u-boot.img on the first partition of the eMMC, but would boot with the
> kernel image on the SDcard. The u-boot version on the eMMC is "U-Boot
> 2014.04-00014-g47880f5 (Apr 22 2014 - 13:23:54)".
>
> As expected, the system booted up successfully with the new kernel. Out of
> curiosity, I booted again pressing the boot button, and expecting an error.
> But to my surprise, again the system booted successfully, using a u-boot
> from I don't know where with a new version number "U-Boot
> 2014.10-00019-gbfd789c (Oct 15 2014 - 11:56:05)". Can anyone explain to me
> what happened? Where does this u-boot come from?

It's all magic voodoo. ;)

We are utilizing a feature first introduced by TI in their omap4430
generation of the 'bootrom'. MLO/u-boot.img are dd'ed below the 1Mb
position.  It should help out users who accidently decide to delete
MLO/u-boot.img from the first partition and wonder why it doesn't
boot.

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/

-- 
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