Hi,Robert ,

When I used sudo dd if=/dev/zero of=/dev/mmcblk1 bs=1M count=10  

i find my BBB can not start without SDcard(my BBB sys is debian 7.5  2G 
eMMC ),

but I insert SDcard(brun debian 8.7 machinekit  2017-02-12)  can start 
(debian 8.7)

when I burn debian 9.X into SDcard and insert to BBB , it's still can not 
start . sometimes  4 LED  bright。。

At present time , only debian 8.7 can be use..if I want to use BBB(without 
SDcard ). How can i do?


在 2018年8月29日星期三 UTC+8下午11:50:05,Robert Nelson写道:
>
> On Wed, Aug 29, 2018 at 10:45 AM Condit Alan <[email protected] 
> <javascript:>> wrote: 
> > 
> > Robert, 
> > 
> > After I wrote the last message I found the “Boot” button on the picture. 
> The problem is that it is under the DB25 cape. 
>
> So that just leaves erasing the eMMC's version of u-boot: 
>
> sudo dd if=/dev/zero of=/dev/mmcblk1 bs=1M count=10 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

-- 
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