Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread William Hermans 
>
> *Released images are published using the following path scheme:*
>
> *Download the BeagleBone Black images:*
>
>- *15.04/stable
>*
>- *15.04/edge
>
> *
>
> *Help: which release/channel should I use?
> *
>
> *http://releases.ubuntu.com/
> /ubuntu--snappy--.img.xz*
>
> *You can download and install a pre-built snappy Ubuntu Core image for
> your BeagleBone Black and copy it to an SD card ready to boot as follows:*
>
*wget http://releases.ubuntu.com/15.04/ubuntu-15.04-snappy-armhf-bbb.img.xz

unxz -c ubuntu-15.04-snappy-armhf-bbb.img.xz | sudo dd of=/dev/sdX bs=32M
sync*

block size of 32M does not even seem reasonable. . . .

On Fri, Jan 1, 2016 at 9:10 PM, doog  wrote:

> I forgot to note, I'm using an FTDI cable to monitor the boot process
> since I'm going headless right now.
>
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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
On Friday, January 1, 2016 at 10:01:50 PM UTC-8, Hilmar Lapp wrote:
>
> Thanks much for your efforts. For one, your results were the final nudge I 
> needed to buy a USB to TTL serial debug cable. It’s possible that I didn’t 
> have enough patience with LEDs all dark and not being able to see any 
> indications of it actually booting. From booting the BeagleBoard Debian 
> Wheezy images from uSD I was used to seeing the LEDs come on very quickly, 
> so I was apparently mistaken to assume this would be the same for the 
> Snappy Core image.
>
> I'm guessing that the boot loader does some of that early LED flashing and 
since Snappy has its own boot loader on the uSD there's not initial flashy 
LEDs 

 

> Second, the fact that booting the image flashed your eMMC is not cool. I 
> was in fact wondering whether it would or not. The documentation is silent 
> about this question, and the file name of the image contains no suggestion 
> that it flashes the eMMC. On AskUbuntu, someone actually asked whether 
> there is a flasher image:
> http://askubuntu.com/questions/713604/snappy-on-beaglebone-black-or-green
>

It could be I held the button too long or not long enough. I've not seen it 
try to flash now even though the eMMC doesn't have a boot able image now. 
I'm thinking that was cockpit error.
 

>
> The answer basically repeats the documentation from developer.ubuntu.com 
> (which does not say anything about flashing versus not), and upon being 
> specifically asked in the comments by people for whom the image failed to 
> flash the eMMC, the poster admits they don’t know about that part. I also 
> tried to glean the answer from the snappy-boot.txt file that it uses 
> instead of the uEnv.txt, but there’s nothing in there that obviously 
> indicates that the eMMC will be flashed. 
>
> To me, whether booting the image will or will not flash your eMMC is a 
> rather important distinction, so to me this is a red flag. On top of that, 
> based on what I can find 15.04 is *only* available as Snappy Core for armhf 
> systems, which means that even just basic things such as installing apache 
> become a huge hassle:
>
> http://askubuntu.com/questions/694397/how-to-install-apache-on-a-raspberry-pi-2-ubuntu-snappy-core
>
> Based on this experience, while they have nice looking websites, I’m 
> afraid the Ubuntu folks don’t have their act together for Ubuntu on BBB, 
> and as a consequence I’ll stay away from them and their images for now.
>

I would think Debian and/or standard Ubuntu are still the best go-to OS's 
for these devices(BBB, rPi, etc). For me at least for now.

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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread William Hermans 
Quite honestly, I have no interest in Ubuntu on this platform. For me, this
is a true embedded platform, unlike many other boards out there. With that
said, 99% of use cases that I can think of do not require a UI running on
the board it's self, per se. Which is the only place I feel Ubuntu belongs(
mostly in the context of desktops )

Anyway, headless, and perhaps a minimal webserver( etc ) for remote access
/ management is what I prefer, and for that role Ubuntu is not the right
distro.

On Fri, Jan 1, 2016 at 11:07 PM, doog  wrote:

> On Friday, January 1, 2016 at 9:43:53 PM UTC-8, William Hermans wrote:
>>
>> Ug, it uses a 3.19.x kernel . . . Now, I'm not even interested in booting
>> it.
>>
>
> ok so I re-imaged the 32G Samsung EVO+ card and it works. Not sure why it
> didn't earlier but oh well.
>
> So what kernel were you looking for? 4.x?  If so it would seem Snappy Core
> for Banana Pi has kernel 4.x so it should be doable for BBB. Just not yet
> 'done'.
>
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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread William Hermans 
>
>
>
> *Second, the fact that booting the image flashed your eMMC is not cool. I
> was in fact wondering whether it would or not. The documentation is silent
> about this question, and the file name of the image contains no suggestion
> that it flashes the eMMC. On AskUbuntu, someone actually asked whether
> there is a flasher
> image:http://askubuntu.com/questions/713604/snappy-on-beaglebone-black-or-green
> *


>From what I noticed, on the first partition ( vfat  ) there are two boot
options. One strictly boot, and one flash. e.g. two different initrd's etc.

On Fri, Jan 1, 2016 at 11:01 PM, Hilmar Lapp  wrote:

> Thanks much for your efforts. For one, your results were the final nudge I
> needed to buy a USB to TTL serial debug cable. It’s possible that I didn’t
> have enough patience with LEDs all dark and not being able to see any
> indications of it actually booting. From booting the BeagleBoard Debian
> Wheezy images from uSD I was used to seeing the LEDs come on very quickly,
> so I was apparently mistaken to assume this would be the same for the
> Snappy Core image.
>
> Second, the fact that booting the image flashed your eMMC is not cool. I
> was in fact wondering whether it would or not. The documentation is silent
> about this question, and the file name of the image contains no suggestion
> that it flashes the eMMC. On AskUbuntu, someone actually asked whether
> there is a flasher image:
> http://askubuntu.com/questions/713604/snappy-on-beaglebone-black-or-green
>
> The answer basically repeats the documentation from developer.ubuntu.com
> (which does not say anything about flashing versus not), and upon being
> specifically asked in the comments by people for whom the image failed to
> flash the eMMC, the poster admits they don’t know about that part. I also
> tried to glean the answer from the snappy-boot.txt file that it uses
> instead of the uEnv.txt, but there’s nothing in there that obviously
> indicates that the eMMC will be flashed.
>
> To me, whether booting the image will or will not flash your eMMC is a
> rather important distinction, so to me this is a red flag. On top of that,
> based on what I can find 15.04 is *only* available as Snappy Core for armhf
> systems, which means that even just basic things such as installing apache
> become a huge hassle:
>
> http://askubuntu.com/questions/694397/how-to-install-apache-on-a-raspberry-pi-2-ubuntu-snappy-core
>
> Based on this experience, while they have nice looking websites, I’m
> afraid the Ubuntu folks don’t have their act together for Ubuntu on BBB,
> and as a consequence I’ll stay away from them and their images for now.
>
>   -hilmar
>
> On Jan 1, 2016, at 11:57 PM, doog  wrote:
>
> for whatever reason I could not get it to boot back into the uSD and it
> started to go back to flashing(cylon eyes). I looked at the partitions and
> there were only 2. After re-imaging the uSD card, I saw 4 partitions. And
> while I was re-imaging I tried to boot from eMMC and it would not, the
> failed flashing left the eMMC goofed up.
>
> But the good news is, once I finished re-imaging, I booted and got back
> into Ubuntu Snappy Core.  Another thing of interest is that while I held
> down the S2/User/Boot button I didn't get any LEDs lit but it started
> booting into the uSD card so I let go of the button. It took a minute of
> booting/testing before it went to town and started loading from uSD(ie LEDs
> ablaze).
>
> I don't know why the 32G Samsung didn't work but I may have forgot what's
> the max uSD size for BBB is.
>
> --
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>
> --
> Hilmar Lapp -:- lappland.io
>
>
>
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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread Hilmar Lapp 
Thanks much for your efforts. For one, your results were the final nudge I 
needed to buy a USB to TTL serial debug cable. It’s possible that I didn’t have 
enough patience with LEDs all dark and not being able to see any indications of 
it actually booting. From booting the BeagleBoard Debian Wheezy images from uSD 
I was used to seeing the LEDs come on very quickly, so I was apparently 
mistaken to assume this would be the same for the Snappy Core image.

Second, the fact that booting the image flashed your eMMC is not cool. I was in 
fact wondering whether it would or not. The documentation is silent about this 
question, and the file name of the image contains no suggestion that it flashes 
the eMMC. On AskUbuntu, someone actually asked whether there is a flasher image:
http://askubuntu.com/questions/713604/snappy-on-beaglebone-black-or-green

The answer basically repeats the documentation from developer.ubuntu.com (which 
does not say anything about flashing versus not), and upon being specifically 
asked in the comments by people for whom the image failed to flash the eMMC, 
the poster admits they don’t know about that part. I also tried to glean the 
answer from the snappy-boot.txt file that it uses instead of the uEnv.txt, but 
there’s nothing in there that obviously indicates that the eMMC will be 
flashed. 

To me, whether booting the image will or will not flash your eMMC is a rather 
important distinction, so to me this is a red flag. On top of that, based on 
what I can find 15.04 is *only* available as Snappy Core for armhf systems, 
which means that even just basic things such as installing apache become a huge 
hassle:
http://askubuntu.com/questions/694397/how-to-install-apache-on-a-raspberry-pi-2-ubuntu-snappy-core

Based on this experience, while they have nice looking websites, I’m afraid the 
Ubuntu folks don’t have their act together for Ubuntu on BBB, and as a 
consequence I’ll stay away from them and their images for now. 

  -hilmar

> On Jan 1, 2016, at 11:57 PM, doog  wrote:
> 
> for whatever reason I could not get it to boot back into the uSD and it 
> started to go back to flashing(cylon eyes). I looked at the partitions and 
> there were only 2. After re-imaging the uSD card, I saw 4 partitions. And 
> while I was re-imaging I tried to boot from eMMC and it would not, the failed 
> flashing left the eMMC goofed up.
> 
> But the good news is, once I finished re-imaging, I booted and got back into 
> Ubuntu Snappy Core.  Another thing of interest is that while I held down the 
> S2/User/Boot button I didn't get any LEDs lit but it started booting into the 
> uSD card so I let go of the button. It took a minute of booting/testing 
> before it went to town and started loading from uSD(ie LEDs ablaze).
> 
> I don't know why the 32G Samsung didn't work but I may have forgot what's the 
> max uSD size for BBB is.
> 
> -- 
> For more options, visit http://beagleboard.org/discuss 
> 
> --- 
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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
On Friday, January 1, 2016 at 10:16:22 PM UTC-8, William Hermans wrote:
>
> Quite honestly, I have no interest in Ubuntu on this platform. For me, 
> this is a true embedded platform, unlike many other boards out there. With 
> that said, 99% of use cases that I can think of do not require a UI running 
> on the board it's self, per se. Which is the only place I feel Ubuntu 
> belongs( mostly in the context of desktops )
>
> Anyway, headless, and perhaps a minimal webserver( etc ) for remote access 
> / management is what I prefer, and for that role Ubuntu is not the right 
> distro.
>

That is your choice but let it be stated that Ubuntu is quite commonly used 
for headless server systems and there has long been an installation 
mechanism for such server based systems.
 http://www.ubuntu.com/download/server/install-ubuntu-server

And Robert Nelson has done some great work at keeping kernels and other 
parts updated for ARM devices( 4.x kernel too ):
http://elinux.org/BeagleBoardUbuntu#Method_1:_Download_a_Complete_Pre-Configured_Image

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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread William Hermans 
How those are triggered however, I had not figured out. I pretty much saw
that kernel 3.19.x was used, and lost interest.

On Fri, Jan 1, 2016 at 11:08 PM, William Hermans  wrote:

>
>>
>> *Second, the fact that booting the image flashed your eMMC is not cool. I
>> was in fact wondering whether it would or not. The documentation is silent
>> about this question, and the file name of the image contains no suggestion
>> that it flashes the eMMC. On AskUbuntu, someone actually asked whether
>> there is a flasher
>> image:http://askubuntu.com/questions/713604/snappy-on-beaglebone-black-or-green
>> *
>
>
> From what I noticed, on the first partition ( vfat  ) there are two boot
> options. One strictly boot, and one flash. e.g. two different initrd's etc.
>
> On Fri, Jan 1, 2016 at 11:01 PM, Hilmar Lapp  wrote:
>
>> Thanks much for your efforts. For one, your results were the final nudge
>> I needed to buy a USB to TTL serial debug cable. It’s possible that I
>> didn’t have enough patience with LEDs all dark and not being able to see
>> any indications of it actually booting. From booting the BeagleBoard Debian
>> Wheezy images from uSD I was used to seeing the LEDs come on very quickly,
>> so I was apparently mistaken to assume this would be the same for the
>> Snappy Core image.
>>
>> Second, the fact that booting the image flashed your eMMC is not cool. I
>> was in fact wondering whether it would or not. The documentation is silent
>> about this question, and the file name of the image contains no suggestion
>> that it flashes the eMMC. On AskUbuntu, someone actually asked whether
>> there is a flasher image:
>> http://askubuntu.com/questions/713604/snappy-on-beaglebone-black-or-green
>>
>> The answer basically repeats the documentation from developer.ubuntu.com
>> (which does not say anything about flashing versus not), and upon being
>> specifically asked in the comments by people for whom the image failed to
>> flash the eMMC, the poster admits they don’t know about that part. I also
>> tried to glean the answer from the snappy-boot.txt file that it uses
>> instead of the uEnv.txt, but there’s nothing in there that obviously
>> indicates that the eMMC will be flashed.
>>
>> To me, whether booting the image will or will not flash your eMMC is a
>> rather important distinction, so to me this is a red flag. On top of that,
>> based on what I can find 15.04 is *only* available as Snappy Core for armhf
>> systems, which means that even just basic things such as installing apache
>> become a huge hassle:
>>
>> http://askubuntu.com/questions/694397/how-to-install-apache-on-a-raspberry-pi-2-ubuntu-snappy-core
>>
>> Based on this experience, while they have nice looking websites, I’m
>> afraid the Ubuntu folks don’t have their act together for Ubuntu on BBB,
>> and as a consequence I’ll stay away from them and their images for now.
>>
>>   -hilmar
>>
>> On Jan 1, 2016, at 11:57 PM, doog  wrote:
>>
>> for whatever reason I could not get it to boot back into the uSD and it
>> started to go back to flashing(cylon eyes). I looked at the partitions and
>> there were only 2. After re-imaging the uSD card, I saw 4 partitions. And
>> while I was re-imaging I tried to boot from eMMC and it would not, the
>> failed flashing left the eMMC goofed up.
>>
>> But the good news is, once I finished re-imaging, I booted and got back
>> into Ubuntu Snappy Core.  Another thing of interest is that while I held
>> down the S2/User/Boot button I didn't get any LEDs lit but it started
>> booting into the uSD card so I let go of the button. It took a minute of
>> booting/testing before it went to town and started loading from uSD(ie LEDs
>> ablaze).
>>
>> I don't know why the 32G Samsung didn't work but I may have forgot what's
>> the max uSD size for BBB is.
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
>> ---
>> You received this message because you are subscribed to a topic in the
>> Google Groups "BeagleBoard" group.
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>> https://groups.google.com/d/topic/beagleboard/6_I1Ox9-sms/unsubscribe.
>> To unsubscribe from this group and all its topics, send an email to
>> beagleboard+unsubscr...@googlegroups.com.
>> For more options, visit https://groups.google.com/d/optout.
>>
>>
>> --
>> Hilmar Lapp -:- lappland.io
>>
>>
>>
>> --
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>>
>
>

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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
On Friday, January 1, 2016 at 9:43:53 PM UTC-8, William Hermans wrote:
>
> Ug, it uses a 3.19.x kernel . . . Now, I'm not even interested in booting 
> it.
>

ok so I re-imaged the 32G Samsung EVO+ card and it works. Not sure why it 
didn't earlier but oh well.

So what kernel were you looking for? 4.x?  If so it would seem Snappy Core 
for Banana Pi has kernel 4.x so it should be doable for BBB. Just not yet 
'done'.

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[beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
well, it should be a snap according to these 
instructions: https://developer.ubuntu.com/en/snappy/start/#try-beaglebone

If found that by googling "ubuntu core beaglebone black" and picking the 
"Getting Started / Developer" link. I like the developer links because they 
generally explain things and describe the why part of operations. On the 
link I provided you will see where they answer your question about zero'ing 
out the boot loader, or not and why.

Given those instructions it's tough to say where your failure originates.

I suppose I can run through the steps and see what I get. Stay tuned.

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[beagleboard] Re: X11VNC fighting me tooth and nail. Would really appreciate some help.

2016-01-01 Thread Billbone 
If you are in Australia, the January 2016 issue of Silicon Chip (a local 
electronics magazine) has an excellent full description of how to do this 
on a RaspberryPi.  It should be exactly the same on a BB.

Bill

On Monday, December 7, 2015 at 12:29:06 PM UTC+11, Bill Dussault wrote:
>
> Greetings,
>
> I am trying to install X11VNC and log into it via my laptop and I am 
> having some tough luck 
>
> Here is what I have done..
>
> I have changed my IP address to a 192.168.1.XX
> My router for some reason still thinks it is the old IP address even when 
> I refresh it. 
>
> I have turned on VNC on the firewall  on my 2wire router
>
> Next I installed VNC: 
>
>- Debian:   sudo apt-get install x11vnc
>
> 3. Enter the below command
>
>  
>
> -Debian:
>
> x11vnc -bg -o %HOME/.x11vnc.log.%VNCDISPLAY -auth 
> /var/run/lightdm/root/:0 -forever
>
>
> (I'm not sure if I turned it on)
>
>
> I can ping the beaglebone from my computer
>
>
> C:\Users\William>ping 192.168.1.XX
>
>
> Pinging 192.168.1.XX with 32 bytes of data:
>
> Reply from 192.168.1.XX: bytes=32 time=3ms TTL=64
>
> Reply from 192.168.1.XX: bytes=32 time=3ms TTL=64
>
> Reply from 192.168.1.XX: bytes=32 time=5ms TTL=64
>
> Reply from 192.168.1.XX: bytes=32 time=3ms TTL=64
>
>
> Ping statistics for 192.168.1.XX:
>
> Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
>
> Approximate round trip times in milli-seconds:
>
> Minimum = 3ms, Maximum = 5ms, Average = 3ms
>
>
> So I can See it. 
>
>
> I start  tightVNC on my laptop
>
>
> 192.168.1.XX:5901  
>
>
> I get connection has been gracefully closed.  Or  Connection 
> was actively Refused...
>
>
> X11VNC has a few configurations when opened on the desktop I am unfamiliar 
> with. No passwords in use as of yet (I was warned when I started)
>
>
> Does anyone see anything out of whack?
>
>
> Thanks! 
>
>
> Bill
>
>
>

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[beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
for whatever reason I could not get it to boot back into the uSD and it 
started to go back to flashing(cylon eyes). I looked at the partitions and 
there were only 2. After re-imaging the uSD card, I saw 4 partitions. And 
while I was re-imaging I tried to boot from eMMC and it would not, the 
failed flashing left the eMMC goofed up.

But the good news is, once I finished re-imaging, I booted and got back 
into Ubuntu Snappy Core.  Another thing of interest is that while I held 
down the S2/User/Boot button I didn't get any LEDs lit but it started 
booting into the uSD card so I let go of the button. It took a minute of 
booting/testing before it went to town and started loading from uSD(ie LEDs 
ablaze).

I don't know why the 32G Samsung didn't work but I may have forgot what's 
the max uSD size for BBB is.

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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread William Hermans 
Ug, it uses a 3.19.x kernel . . . Now, I'm not even interested in booting
it.

On Fri, Jan 1, 2016 at 10:13 PM, William Hermans  wrote:

> *I don't know why the 32G Samsung didn't work but I may have forgot what's
>> the max uSD size for BBB is.*
>>
>
> Technically, sdhc size, or 32G, but in reality, sdxc have been proven to
> work as well. At sdhc speeds. Robert's gotten a 64G to work, and someone
> else claimed to have had a bootable 128G sdxc card.
>
> On Fri, Jan 1, 2016 at 9:57 PM, doog  wrote:
>
>> for whatever reason I could not get it to boot back into the uSD and it
>> started to go back to flashing(cylon eyes). I looked at the partitions and
>> there were only 2. After re-imaging the uSD card, I saw 4 partitions. And
>> while I was re-imaging I tried to boot from eMMC and it would not, the
>> failed flashing left the eMMC goofed up.
>>
>> But the good news is, once I finished re-imaging, I booted and got back
>> into Ubuntu Snappy Core.  Another thing of interest is that while I held
>> down the S2/User/Boot button I didn't get any LEDs lit but it started
>> booting into the uSD card so I let go of the button. It took a minute of
>> booting/testing before it went to town and started loading from uSD(ie LEDs
>> ablaze).
>>
>> I don't know why the 32G Samsung didn't work but I may have forgot what's
>> the max uSD size for BBB is.
>>
>> --
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>
>

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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
I forgot to note, I'm using an FTDI cable to monitor the boot process since 
I'm going headless right now.

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Re: [beagleboard] Re: Fickle HDMI issue with Beaglebone Black

2016-01-01 Thread doog 
ok, then maybe some of the things I used to do as a tech will help. I used 
to use the ole finger on critical parts in the area of question and see 
what/if something changes. This was easier to see on/with analog systems 
but digital streaming or debug looping could be used for digital circuits. 
And done leave out capacitors but I would address components in a logical 
fashion to help isolate was was just added capacitance to the circuit and 
what was solder joint issues.

I also used a spray can to freeze/cool areas to see if components were 
susceptible to temp changes and out of spec or on edge of failure.

Doug

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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread William Hermans 
>
> *I don't know why the 32G Samsung didn't work but I may have forgot what's
> the max uSD size for BBB is.*
>

Technically, sdhc size, or 32G, but in reality, sdxc have been proven to
work as well. At sdhc speeds. Robert's gotten a 64G to work, and someone
else claimed to have had a bootable 128G sdxc card.

On Fri, Jan 1, 2016 at 9:57 PM, doog  wrote:

> for whatever reason I could not get it to boot back into the uSD and it
> started to go back to flashing(cylon eyes). I looked at the partitions and
> there were only 2. After re-imaging the uSD card, I saw 4 partitions. And
> while I was re-imaging I tried to boot from eMMC and it would not, the
> failed flashing left the eMMC goofed up.
>
> But the good news is, once I finished re-imaging, I booted and got back
> into Ubuntu Snappy Core.  Another thing of interest is that while I held
> down the S2/User/Boot button I didn't get any LEDs lit but it started
> booting into the uSD card so I let go of the button. It took a minute of
> booting/testing before it went to town and started loading from uSD(ie LEDs
> ablaze).
>
> I don't know why the 32G Samsung didn't work but I may have forgot what's
> the max uSD size for BBB is.
>
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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 

On Friday, January 1, 2016 at 8:23:00 PM UTC-8, William Hermans wrote:


> *wget http://releases.ubuntu.com/15.04/ubuntu-15.04-snappy-armhf-bbb.img.xz 
> 
> unxz -c ubuntu-15.04-snappy-armhf-bbb.img.xz | sudo dd of=/dev/sdX bs=32M
> sync*
>
> block size of 32M does not even seem reasonable. . . .
>

I agree and most of the time I use 1M  but stuck with what was stated and 
it did work. 

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[beagleboard] Errors reading multiple Analog Inputs from Beaglebone Black using C++

2016-01-01 Thread Sunny Sharma 
Hi friends,

I am trying to voltage values from 2 analog sensors which are connected to 
pins AIN0 and AIN1 using C++. I have taken Derek Molloy's code for reading 
one voltage value and edited it to add a second pin to read values from. *The 
code is as follows: *

#include
#include
#include
#include
#include
using namespace std;

#define LDR_PATH "/sys/bus/iio/devices/iio:device0/in_voltage"

int readAnalog(int number){  
   
   stringstream ss; 
   
   ss << LDR_PATH << number << "_raw"; 
   
   fstream fs; 
   
   fs.open(ss.str().c_str(), fstream::in); 
   
   fs >> number; 
   
   fs.close(); 
   
   return number;
   
}

int main(int argc, char* argv[]){
   
   cout << "Starting the IR distance sensor program:" << endl;
   
   while(1) {
   
  int value0 = readAnalog(0);
  int value1 = readAnalog(1);
  float V0 = ((float)value0 / 4096) * 1.8;
  float V1 = ((float)value1 / 4096) * 1.8; 
  
  cout << "Sensor0 is: " << V0 << " Sensor1 is: " << V1 << '\r' << 
flush;
  
  usleep(10); 
  
   }
   
   return 0;
}

However, when I run this code, after 10-15 successful iterations, *I 
receive this error message: *

terminate called after throwing an instance of 'std::ios_base::failure'
  what():  basic_filebuf::underflow error reading the file
Aborted 

I am not sure as to why I am receiving this error, or really what this 
error message even means. My guess it is some access error when trying to 
read the pin value. 

The Adafruit BBIO python library actually found a work around this issue in 
C, but I'm not sure how I can extrapolate this to C++ 
(see: 
https://github.com/adafruit/adafruit-beaglebone-io-python/blob/master/source/c_adc.c)
 

If anyone has any insight or help they could offer, that would be very 
helpful! 

Thanks 

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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread Hilmar Lapp 

> On Jan 1, 2016, at 9:54 PM, doog  wrote:
> 
> well, it should be a snap according to these instructions: 
> https://developer.ubuntu.com/en/snappy/start/#try-beaglebone 
> 
Yes. That’s indeed the link I put in my original post.

> […] you will see where they answer your question about zero'ing out the boot 
> loader, or not and why.

Yes, except that what they talk about zeroing out the boot loader on the *eMMC* 
(not the SD card). I do want to keep the eMMC-resident boot loader, and based 
on what that documentation says, that’s OK and only requires pushing the 
user/boot button (which I did).

> I suppose I can run through the steps and see what I get. Stay tuned.


That’d be great. I’ve gotten to the point now that I can insert the card to a 
running system on the BBB for inspection, without crashing it as a result. I 
downloaded the image again, this time using curl, and then burned it to the SD 
card again. Now the partition layout shows as they say it should:

$ sudo fdisk -l /dev/mmcblk0

Disk /dev/mmcblk0: 32.2 GB, 32227983360 bytes
4 heads, 32 sectors/track, 491760 cylinders, total 62945280 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xa3c9235b

Device Boot  Start End  Blocks   Id  System
/dev/mmcblk0p1   *8192  270335  131072c  W95 FAT32 (LBA)
/dev/mmcblk0p2  270336 2367487 1048576   83  Linux
/dev/mmcblk0p3 2367488 4464639 1048576   83  Linux
/dev/mmcblk0p4 4464640 7614463 1574912   83  Linux

The p2 and p3 partitions are labeled system-a and system-b, p4 is labeled 
‘writable’ and p1 is labeled system-boot, all as they are supposed to be. p1 is 
bootable.

However, booting from it still fails. No LEDs ever light, everything except the 
power LED stays dark.

  -hilmar
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Re: [beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread William Hermans 
I have no idea *of* this image, ubuntu is not necessarily even a low
priority for me. But I would imagine one could simply omit the block size
parameter entirely.

Regardless, I'm downloading the image now, and will mount it as a loopback,
and see what I can poke around and find out. Maybe even temp install to
sdcard, as the instructions are not exactly complex, or hard . . . being
only 4 simple commands.

On Fri, Jan 1, 2016 at 9:26 PM, doog  wrote:

>
> On Friday, January 1, 2016 at 8:23:00 PM UTC-8, William Hermans wrote:
> 
>
>> *wget http://releases.ubuntu.com/15.04/ubuntu-15.04-snappy-armhf-bbb.img.xz 
>> 
>> unxz -c ubuntu-15.04-snappy-armhf-bbb.img.xz | sudo dd of=/dev/sdX bs=32M
>> sync*
>>
>> block size of 32M does not even seem reasonable. . . .
>>
>
> I agree and most of the time I use 1M  but stuck with what was stated and
> it did work.
>
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Re: [beagleboard] Errors reading multiple Analog Inputs from Beaglebone Black using C++

2016-01-01 Thread William Hermans 
It's been a while since I've written anything in C++, but I notice you're
not doing any error checking on your filestream. For instance check out the
very simply code listing I demonstrate here ( in C ).
http://www.embeddedhobbyist.com/2015/10/beaglebone-black-adc/

Notice that I'm checking if length is -1, and if so, moving code execution
back up to the top of the loop. Using continue. You should be doing
something similar( whatever filestream allows ). Also, I've not idea how
filestream works in Linux, but if you're opening a new file descriptor
every function call, you'll want to refactor that out. e.g. you get your
file descriptor only once when the executable is first run, and then
operate off that.

Another thing that you have not really asked about but deserves mention.
You're declaring 2 int's and two floats every program loop. You'll want to
fix that . . .

On Fri, Jan 1, 2016 at 9:26 PM, Sunny Sharma 
wrote:

> Hi friends,
>
> I am trying to voltage values from 2 analog sensors which are connected to
> pins AIN0 and AIN1 using C++. I have taken Derek Molloy's code for reading
> one voltage value and edited it to add a second pin to read values from. *The
> code is as follows: *
>
> #include
> #include
> #include
> #include
> #include
> using namespace std;
>
> #define LDR_PATH "/sys/bus/iio/devices/iio:device0/in_voltage"
>
> int readAnalog(int number){
>
>stringstream ss;
>
>ss << LDR_PATH << number << "_raw";
>
>fstream fs;
>
>fs.open(ss.str().c_str(), fstream::in);
>
>fs >> number;
>
>fs.close();
>
>return number;
>
> }
>
> int main(int argc, char* argv[]){
>
>cout << "Starting the IR distance sensor program:" << endl;
>
>while(1) {
>
>   int value0 = readAnalog(0);
>   int value1 = readAnalog(1);
>   float V0 = ((float)value0 / 4096) * 1.8;
>   float V1 = ((float)value1 / 4096) * 1.8;
>
>   cout << "Sensor0 is: " << V0 << " Sensor1 is: " << V1 << '\r' <<
> flush;
>
>   usleep(10);
>
>}
>
>return 0;
> }
>
> However, when I run this code, after 10-15 successful iterations, *I
> receive this error message: *
>
> terminate called after throwing an instance of 'std::ios_base::failure'
>   what():  basic_filebuf::underflow error reading the file
> Aborted
>
> I am not sure as to why I am receiving this error, or really what this
> error message even means. My guess it is some access error when trying to
> read the pin value.
>
> The Adafruit BBIO python library actually found a work around this issue
> in C, but I'm not sure how I can extrapolate this to C++ (see:
> https://github.com/adafruit/adafruit-beaglebone-io-python/blob/master/source/c_adc.c
> )
>
> If anyone has any insight or help they could offer, that would be very
> helpful!
>
> Thanks
>
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[beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
well, it booted fine off the 8GB uSD card and I shelled into it using "ssh 
ubuntu@webdm.local"

here's some initial login capture:
To run a command as administrator (user "root"), use "sudo ". See 
"man sudo_root" for details. (BeagleBoneBlack)ubuntu@localhost:~$ ls 
(BeagleBoneBlack)ubuntu@localhost:~$ ll total 28 drwxr-xr-x 4 ubuntu ubuntu 
4096 Jan 2 04:17 ./ drwxr-xr-x 3 root root 4096 Nov 12 18:11 ../ -rw-r--r-- 
1 ubuntu ubuntu 220 Nov 12 18:11 .bash_logout -rw-r--r-- 1 ubuntu ubuntu 
3760 Nov 12 18:11 .bashrc drwx-- 2 ubuntu ubuntu 4096 Jan 2 04:17 
.cache/ -rw-r--r-- 1 ubuntu ubuntu 675 Nov 12 18:11 .profile drwx-- 2 
ubuntu ubuntu 4096 Nov 13 09:36 .ssh/ (BeagleBoneBlack)ubuntu@localhost:~$ 
ls (BeagleBoneBlack)ubuntu@localhost:~$ df -h Filesystem Size Used Avail 
Use% Mounted on udev 239M 0 239M 0% /dev tmpfs 50M 8.6M 41M 18% /run 
/dev/disk/by-label/system-a 976M 500M 410M 55% / /dev/mmcblk0p4 5.2G 51M 
4.9G 2% /writable tmpfs 246M 4.0K 246M 1% /etc/fstab tmpfs 246M 0 246M 0% 
/dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 246M 0 246M 0% /sys/fs/cgroup 
tmpfs 246M 0 246M 0% /mnt tmpfs 246M 0 246M 0% /tmp tmpfs 246M 0 246M 0% 
/var/lib/sudo /dev/mmcblk0p3 976M 500M 410M 55% /writable/cache/system 
/dev/mmcblk0p1 127M 40M 87M 31% /boot/uboot cgmfs 100K 0 100K 0% 
/run/cgmanager/fs tmpfs 50M 0 50M 0% /run/user/1000 
(BeagleBoneBlack)ubuntu@localhost:~$ 

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[beagleboard] can't turn off eth0

2016-01-01 Thread Pedro Peres 
I can't shut down eth0 
the /etc/network/interfaces file has the setup lines for eth0 commented 
out, as shipped
ifdown eth0  gives me : interface eth0 not configured 
ifconfig eth0 down gives me no response
and in both cases the port stays connected.
Any ideas on how to accomplish turning it off?


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Re: [beagleboard] Re: Cannot boot from expanded microSD and I don't know where to look for logs

2016-01-01 Thread Davide Picchi 
Logs are under:

1.) logs are at /var/*log*/  /* without s */
>



2015-12-31 4:01 GMT+01:00 Graham :

> 1.) logs are at /var/logs/
> 2.) look in the file named syslog for the latest boot information.  Other
> log files may have specialized information.
> 3.) I usually take a card that has had the 4G image installed, that has
> been tested for proper booting, then expand the partition by plugging the
> card into another LINUX computer, and using gparted to expand the partition
> to the desired size, including the maximum for the card.
> 4.) Expanding to 30GB on a 32 GB card should not be a problem.
> 5.) Cheap cards can cause problems. Use a quality card.
>
> --- Graham
>
> ==
>
>
> On Wednesday, December 30, 2015 at 3:24:50 PM UTC-6, gor...@gmail.com
> wrote:
>>
>> Hello,
>> I just got my bbb and I started playing with it. So I have written newest
>> stable debian on microSD and I was able to boot it from the card but then I
>> used grow partition script to expand partition and now it has 30GB
>> partition however I am not able to boot from it. When I try USR LEDs blink
>> for a fraction of a second and USR2 was left turned on. The funny thing is,
>> it has same behavior even if I don't hold USER/BOOT button so it won't boot
>> even if the card is present.
>>
>> So where are there any logs for unsuccessful boot? If so, where can I
>> find them?
>> Am I unable to use 30GB as a root partition or something?
>>
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Re: [beagleboard] Re: Fickle HDMI issue with Beaglebone Black

2016-01-01 Thread Hilmar Lapp 
I think the TV is recognizing the BBB has disconnected - it says searching for 
signals when the BBB is powered off or between boots, as it always says when 
there is no signal on the HDMI input.

I wish moving the TV to another input would resolve this - it was among the 
first things I tried, but to no avail. It seems that based on what I’m seeing 
it’s not the TV that does something odd (and if it did, it would more likely do 
that too with the other boards, I would assume), but it’s the HDMI on the board 
that does. If there were a way to “reset” the HDMI interface on the board, I’d 
try that, but I haven’t found one yet.

The EDID is indeed showing more than one supported mode - see the “1920x1080” 
and the “1280x720” modes in the output I enclosed in my original post.

  -hilmar

> On Jan 1, 2016, at 11:39 AM, doog  wrote:
> 
> is there any chance the TV interface is not recognizing the BBB has 
> disconnected and is not providing EDID information? Maybe just moving the TV 
> to another input and then back again will reset the TV HDMI input?  Shouldn't 
> the EDID output be showing more than one supported mode? That's what's 
> leading me to believe the TV is stuck or something.
> 
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[beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread doog 
if this is the first time running from the uSD card then how about using a 
known good image just to verify you've got things booting correctly? Then 
you'll know it's your image and not something else.

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[beagleboard] Re: Fickle HDMI issue with Beaglebone Black

2016-01-01 Thread doog 
is there any chance the TV interface is not recognizing the BBB has 
disconnected and is not providing EDID information? Maybe just moving the 
TV to another input and then back again will reset the TV HDMI input? 
 Shouldn't the EDID output be showing more than one supported mode? That's 
what's leading me to believe the TV is stuck or something.

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[beagleboard] Re: Ubuntu snappy 15.04 image does not boot from SD card

2016-01-01 Thread Hilmar Lapp 
That's why I said the card otherwise works fine. I've used it to burn to 
the card and boot from the card the BBB Debian Wheezy 7.8 (March 1) and 7.9 
(Nov 12) images, with everything working fine. It's specifically when I 
turn to the Ubuntu image that things turn awry.

But perhaps that's because the Ubuntu image requires some additional steps 
that I'm missing. For example, perhaps I need to zero out the first 512 or 
1024 bytes of the device. It didn't say that anywhere, which is why I 
didn't do it. But maybe the fact that I had previously other images on it 
somehow makes that necessary (even though I wouldn't think so).

I'd be especially curious whether everyone else here has been able to use 
the Ubuntu Snappy Core 15.04 image just fine, so that I know it's something 
with what I'm doing or something perhaps with the boot loader on my eMMC. 
(Even though I thought that if you press the User/Boot button, it disables 
that boot loader and changes boot order to the microSD? And that still 
doesn't explain the weird OOM error I get when inserting the card into the 
running system.)

Also, if there's a better place to ask than here, let me know.

  -hilmar

On Friday, January 1, 2016 at 11:31:06 AM UTC-5, doog wrote:
>
> if this is the first time running from the uSD card then how about using a 
> known good image just to verify you've got things booting correctly? Then 
> you'll know it's your image and not something else.
>

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