[beagleboard] Re: No ethernet connection to BBB when powered by 5V cable

[jaka . koren . isys]

I figured something out - the problem was not in the boards, but in the 
network itself. The switch I connected the boards to was broken. Now I can 
get the BBBs to connect to internet and ping eachother. Thank you for help.

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[beagleboard] No ethernet connection to BBB when powered by 5V cable

[jaka . koren . isys]

Hello, I am a newbie trying to use two Beaglebone Black boards within the 
same lan network, and am having problems. Connecting them to PC with usb 
cable works fine, and I can connect to *beaglebone.local* fine with putty, 
and access built-in IDEs through web browser on windows.

The problems arise when I try to turn them on while powered by 5V cable, 
without usb. The Ethernet cable to my network is plugged before boot, and 
lights turn on as expected. But it appears the board does not broadcast 
into the network, and cannot be connected to with ssh. I tried setting up a 
static 
ip address 

 
when it was connected through usb, but it doesn't seem to help, putty 
connection timeouts on direct IP connection, and cannot find* 
beaglebone.local* hosts in the network. The weirdest thing is that the 
ethernet connection worked fine a few weeks ago, this problem started only 
recently.

I am booting the boards from an sd card with debian-9.9-iot image. What 
could be the cause of this? Is there a solution that isn't updating the 
image? Are the usb server and ethernet server on BBB different systems?

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[beagleboard] BBB RTC synchronization with NTP

[jaka . koren . isys]

Current Beaglebone Black images offer support for high resolution timers in 
Linux kernel. They are controlled by ktime.h library and depend on system's 
clocks (CLOCK_MONOTONIC, CLOCK_REALTIME,...). The clocks can be looked up 
from userspace programs with commands clock_gettime 
, clock_settime and clock_getres 
from time.h library.
What I would like to do is make/write a protocol in c that would 
synchronize realtime clocks between two boards over ethernet cable 
connection or internet. My goal is testing how accurately two clocks can be 
set to the same global time under different protocols. I'm planning to 
start with ntp, would using an existing library or client make sense here? 
I read BBB sometimes comes with daemons for ntp, in that case how would I 
set one board to act as a server in protocol?

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