boot from eMMC while sd card inserted

[maram....@googlemail.com]

Hallo,

I would like to use the sd card as extended harddrive to keep data on it. But, whenever I reboot the BBB (Debian 9) it will try to boot from sd card, even if this is not marked as bootable. How to solve the problem?

Kind regards
Markus

[Tarmo Kuuse]

Hi Markus,

You haven't described how "try to boot" does not work for you. Does the SD boot succeed or does it fail, are there any error messages, etc. 

Do you have a bootable image on the eMMC? In my experience U-Boot is configured to attempt to boot from SD card whenever it finds anything bootable on it. This happens regardless of the state of the Boot button. I also suspect partition flags (bootable, non-bootable) are not honored. 

Anyway, I've re-partitioned and formatted my SD cards - after that my BB-s happily boot from eMMC. 

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Kind regards,

Tarmo

[Yiling Cao]

You can hack the u-boot source code, basically detect how many mmc interfaces you have found, and choose according to your needs.

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Yiling Cao

http://ariaboard.com/

http://shanghainovotech.com/