Hi,

I had the same issue on BBB, solution is in this link 
<http://derekmolloy.ie/write-a-new-image-to-the-beaglebone-black/>
You can give a try if you still facing this issue.

Regards,
YG

On Wednesday, July 6, 2016 at 3:30:51 PM UTC+5:30, malkowki wrote:
>
> Hello all,
>
> I am struggling with booting the BBB REVC from 4GB class 10 uSD flashed 
> with the image 4.1.21-bone-rt-r20 and u-boot image from branch 
> v2016.07-rc2( I have followed all the steps from R.Nelson eewiki). when I 
> press the S2 button and plug the 5V barrel supply I can see on my serial 
> console CCCCCC while I was expecting at start to see all the 4 LEDS lighing 
> on.
> I used the same uSD card and try it on the BBG, the board boots without 
> even pressing the S2 button.
>
> Its there sometime I need to setup in the u-boot in order to correctly 
> boot off uSD? I am wondering why I have no problem with the BBG? As I know 
> they use the same ARM Core?
>
> Thanks in advance for your answer.
>
> Beninio
>
>
> Below the boot message on BBG without even pressing S2
> [    0.000000] Booting Linux on physical CPU 0x0
> [    0.000000] Initializing cgroup subsys cpuset
> [    0.000000] Initializing cgroup subsys cpu
> [    0.000000] Initializing cgroup subsys cpuacct
> [    0.000000] Linux version 4.1.21-bone-rt-r20 (beninio@mppdev) (gcc 
> version 4.9.4 20151028 (prerelease) (Linaro GCC 4.9-2016.02) ) #3 Wed May 
> 25 13:55:22 CEST 2016
> [    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=
> 50c5387d
> [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing 
> instruction cache
> [    0.000000] Machine model: TI AM335x BeagleBone Green
> [    0.000000] cma: Reserved 24 MiB at 0x9e800000
> [    0.000000] Memory policy: Data cache writeback
> [    0.000000] On node 0 totalpages: 131072
> [    0.000000] free_area_init_node: node 0, pgdat c0ab0d7c, node_mem_map 
> de36d000
> [    0.000000]   Normal zone: 1152 pages used for memmap
> [    0.000000]   Normal zone: 0 pages reserved
> [    0.000000]   Normal zone: 131072 pages, LIFO batch:31
> [    0.000000] CPU: All CPU(s) started in SVC mode.
>
>
> Here the boot message from BBB REV C using the same uSD card pressing S2 
> and plug in the 5V barrel
> CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
>
>
>

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