BBB running, but no lights on Bela : v0.3.6b

adamcfrench

Hello All,

Any ideas on how to troubleshoot this current issue would be helpful.

Current Hardware:
- Have tried two new out of the box Bela Boards.
- Have tried two not brand new but known to be working BeagleBone Blacks.

Firmware:
- Have tried v0.3.6a and v0.3.6b

From all current configurations I have the BBB booting, but show no sign of life from Bela board - no LEDs or anything.

Digging out schematics and probing pins.

I've read in one spot that the BBB is not yet working consistently, but haven't seen that stated globally.

Thanks.

giuliomoro

hmmm . Most likely you need this: https://github.com/BelaPlatform/Bela/wiki/Manage-your-SD-card#booting-problems ?

adamcfrench

thanks guiliomoro.

here's the blow by blow:

inserted SD card with bela_image_v0.3.6b_img flashed on 8gb card.
Held 'user' button, applied power via micro USB.
Sat for 1 minute with just the power light on and contemplated late night troubleshooting things.
concluded my bela-sd card isn't booting.

inserted SD card with bone-debian-9.5-iot-armhf-2018-10-07-4gb.img
Held 'user' button and applied power via micro USB.
Watched the nice little light show. Contemplated all the time I've spent debugging.

Hopped over to terminal and ran sudo ssh debian@192.168.7.2

Got

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:djHZC/6EVwpitH3QdJ9+9Dc52f5k4D/9m6RA+Hdfo84.
Please contact your system administrator.
Add correct host key in /var/root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /var/root/.ssh/known_hosts:8
ECDSA host key for 192.168.7.2 has changed and you have requested strict checking.
Host key verification failed.

This is currently my favorite error, which is dealt with by:
sudo vim /var/root/.ssh/known_hosts
and then scrolling down and deleting the last line of the known_hosts file.

then back to ssh terminal with much success.

ran /opt/Bela/bela_flash_emmc.sh
which returned
-bash: /opt/Bela/bela_flash_emmc.sh: No such file or directory
Searching by hand I confirmed no /Bela directory in the /opt directory.

looking for an eMMC deletion tactic I chose this, from Ivan.
https://e2e.ti.com/support/legacy_forums/embedded/linux/f/354/t/398780?Script-to-Erase-Emmc-independently-Beagle-Bone-Black
With thoughts of Hunt for Red October I ran the 20 steps (very quietly).
I stopped after Ivan's step 20, and did not make the eMMC bootable for the time being.
then
sudo shutdown now
Removed power and reapplied power vi microUSB

Watched the light show, then logged in via SSH with great success.

then inserted SD card with bela_v0.3.6b.img
applied power
And there it hangs with USB0 and USB1 lit.
Tried same with bela cape on and got only power light.
Tried the jumper trick to force SD.

Concluded my bela SD card is not bootable. Will hit it again later.

giuliomoro

adamcfrench then back to ssh terminal with much success.

when you succeeded logging in, how did you do it? ssh debian@... or ssh root@... ?
What did you see? Something like

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.

 ____  _____ _        _
| __ )| ____| |      / \
|  _ \|  _| | |     / _ \
| |_) | |___| |___ / ___ \
|____/|_____|_____/_/   \_\

The platform for ultra-low latency audio and sensor processing

http://bela.io

Bela image, v0.3.6,  5 October 2018

More info at https://github.com/BelaPlatform/bela-image-builder/releases

Built with bela-image-builder master@a4e9924154600e329889fe2564b6331575b25e37
on Fri  5 Oct 12:28:36 BST 2018

WHERE did you run /opt/Bela/bela_flash_emmc.sh ? On the board (after sshing into it) or on the host computer? It should be run on the board, and if the file is not there it means that you are not on the Bela image. But the fact that you got your favourite error seems to suggest that you booted the image correctly.

adamcfrench

Haven't had the Bela image boot yet. I have booted successfully from debian_9.5_iot and debian_9.5_LXQT.

Logged in as debian via ssh over USB from terminal in OSX.

Will reflash those sd cards (have tried to) carefully from scratch and see if I can pick up an error in my previous process. I do those from command line - have worked with other images.

Will update soon.

giuliomoro

have you unzipped the image before flashing? Did you go through the "verifying" stage here ?

adamcfrench

flashed a new SD card with 0.3.6b

booted up while holding down USER button.

ssh connection with great success.

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.

 ____  _____ _        _
| __ )| ____| |      / \
|  _ \|  _| | |     / _ \
| |_) | |___| |___ / ___ \
|____/|_____|_____/_/   \_\

The platform for ultra-low latency audio and sensor processing

http://bela.io

Bela image, v0.3.6b, 23 October 2018

More info at https://github.com/BelaPlatform/bela-image-builder/releases

Built with bela-image-builder master@a4e9924154600e329889fe2564b6331575b25e37
on Tue 23 Oct 13:25:56 BST 2018

root@bela:~#

ran /opt/Bela/bela_flash_emmc.sh with great success.

shutdown and restart.
booted without USER button with great success.

Installed Bela cape and applied power via micro USB
- see a faintly pulsing power blue LED at 1hz.

Tried jumper across P8_1 to P8_43
- faintly pulsing power blue LED at 1hz.

removed Bela cape and applied power.

booted with great success.

giuliomoro

Ok now this is weird. Is the cape the correct way around? What flavour of BeagleBone do you have?

Can you try with a different cable or power source?

adamcfrench

BeagleBoneBlack wireless. Have a green coming in the mail.

cape is the right way - as per diagram with notch towards barrel connector.

just booted up on a barrell connector to a 10 watt supply with cape on, but get no lights on the cape.

had HDMI hooked up and got 'no input.'

reconnected to laptop with USB and ssh to root with success, but no Bela lights yet.

giuliomoro

adamcfrench reconnected to laptop with USB and ssh to root with success, but no Bela lights yet.

What do you mean no Bela lights? There are no LEDs on the Bela cape.

If you manage to ssh root@... and see the Bela ASCII splash as above, it means everything is ok. You can then bring up the IDE in the browser at the same IP address and run projects from there.

lokki

see here:

https://forum.bela.io/d/200-beaglebone-black-wireless/25

adamcfrench

All resolved. Two issues were:
1) there are no lights on Bela - hahaha - jokes on me. I assumed there was an LED somewhere on the cape.
2) there was previous image on the eMMC of the BBB. Wiping that out sorted the booting issue.

Thanks for the quick replies and active forum.

giuliomoro

great! If you want an LED on the cape you have to upgrade to a Bela Mini:
https://shop.bela.io/bela-mini/bela-mini-cape
actually, you get TWO LEDs (a blue and a red one, in the same package): great success

🙂 just joking