How to force boot from SD Card??

[Steve Moser]

OK, first let me apologize if this has been answered several times before.

I have a stripped beaglebone black that boots from SD card.  When I mean stripped it does NOT have eMMC, USB Client, reset button, HDMI Framer, boot button, micro HDMI, USB Host and more missing.  Like I said it boots from SD card.  It is running Angstrom GNU/Linux v2013.06 (Core edition) version 3.8.13

So I have another Full blown BBB with nothing missing.  It is running Angstrom GNU/Linux version 3.8.13-00726-gbe46145-dirty from the eMMC.

What I want to do is take the SD card from the stripped BBB and boot from it in the Full BBB, When I try this, it still boots from the eMMC and not the SD card.

Any suggestions/Ideas to try??  Thanks

[Robert Nelson]

Push and hold the "boot" button before you apply power..

Regards,

--
Robert Nelson
https://rcn-ee.com/

[Steve Moser]

Great, thank you.  Anyway to make that a permanent solution?

[Robert Nelson]

On Mon, Jan 4, 2016 at 10:36 AM, Steve Moser
<steve...@lanamfoundry.com> wrote:
> Great, thank you. Anyway to make that a permanent solution?

Option a:
erase eMMC

Option b:
understand eMMC's u-boot..

https://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-DealingwitholdBootloaderineMMC

[Gerald Coley]

If the eMMC is not there, it should boot from the SD card by default, assuming you have left all the boot resistors in their default configuration..

Gerald

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[Steve Moser]

Thanks

On Monday, January 4, 2016 at 11:24:20 AM UTC-5, Steve Moser wrote:

[John Syne]

Or if you are a hardware guy and you can work with small SMD components, you can also change the SYS_BOOT configuration as shown on Page 6 of the BBB schematics. In essence, move R68 to R93. This will be the equivalent to pressing the boot button.

Regards,

John

[Steve Moser]

OK, this sure looks easy, but I know I have trying to skip a couple steps or maybe not at all because it does not work for me.

I took an image of my SD card that was running in the BBB without eMMC.

I took that image and tried to use it to write to the eMMC, but it did not work.

Here is the guide:

http://elinux.org/BeagleBone_Black_Extracting_eMMC_contents

If I am missing a simple step please let me know, 

(I have tried to delete or rename the MLO file so this will auto boot from SD, but when I boot by connecting to the micro usb no media drive shows up)

Or any simple way to delete the eMMC?