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by rln
Sat Sep 02, 2017 9:37 pm
Forum: General discussion
Topic: EMC emission at 200mhz
Replies: 31
Views: 8226

Re: EMC emission at 200mhz

discovered that the 50MHz is the rate at which the SD card is read. So one thing I'm going to try is to run an overlay that forces all of the read/writes to be done in RAM. If you want to try entirely without a SD card my Nard SDK might be something for you. Everything runs from RAM, so once it has...
by rln
Mon Aug 28, 2017 10:23 am
Forum: Compute Module
Topic: rPI Compute Module I/O Question
Replies: 6
Views: 2313

Re: rPI Compute Module I/O Question

Each pin can individually have different alternative functions.
by rln
Fri Aug 18, 2017 9:15 am
Forum: General discussion
Topic: What can you do when the filesystem is corrupted
Replies: 7
Views: 3450

Re: What can you do when the filesystem is corrupted

I am actually investigating a way to remotely reflash the SD card. It isn't perfect, but I think I have figured out a way to do it with a USB drive plugged in. You might also be interested in my Nard SDK which is very reliable. Everything runs from RAM and thus remote flashing of new SD card images...
by rln
Mon Mar 20, 2017 10:47 am
Forum: Other
Topic: Announcing Nard SDK v1.10
Replies: 0
Views: 646

Announcing Nard SDK v1.10

Nard SDK version 1.10 has been released!

Nard is software development kit for embedded systems with Raspberry Pi. It runs entirely in RAM and is very long term robust. It's perfect as a platform for IoT and industrial controllers.

http://www.arbetsmyra.dyndns.org/nard/
by rln
Wed Mar 15, 2017 9:30 pm
Forum: Beginners
Topic: Throttled 0x5000?
Replies: 5
Views: 2648

Re: Throttled 0x5000?

You might want to try my rpiburn program for this. It's a power supply testing program which gives you a clear text report if the power supply malfunctions.
https://github.com/ronny-nilsson/rpiburn
by rln
Tue Mar 14, 2017 10:10 am
Forum: Advanced users
Topic: CustomOS
Replies: 1
Views: 517

Re: CustomOS

You didn't specify how fast your fast boot need to be. :-/ My project Nard SDK might be of interest to you though if you need customization. A default image boots in ~15 seconds on a Rpi 3B.
http://www.arbetsmyra.dyndns.org/nard/
by rln
Tue Mar 14, 2017 9:29 am
Forum: General discussion
Topic: SD card corruption after shutdown
Replies: 11
Views: 6984

Re: SD card corruption after shutdown

riker1 wrote:I had the same issue also twice.
Hints are welcome
You may be interested in trying my Nard SDK as a workaround. It prevents the SD card problem by running entirely from RAM.
http://www.arbetsmyra.dyndns.org/nard/
by rln
Tue Feb 28, 2017 11:29 am
Forum: Advanced users
Topic: Pi 3 Always Throttled 0x50005
Replies: 5
Views: 2697

Re: Pi 3 Always Throttled 0x50005

For remote monitoring of the voltage alarm my rpiburn tool might be an option. It tries to trigger the alarm forcefully by loading the CPU while simultaneously supervises voltage, temperature etc. In combination with cron it can warn you for any PSU degradation over time or ambient temperature varia...
by rln
Thu Feb 23, 2017 12:15 pm
Forum: General discussion
Topic: Feedback wanted: Headless Pi project
Replies: 4
Views: 1689

Re: Feedback wanted: Headless Pi project

@bjpirt: You might be interested in my project Nard SDK which has lots of the feature you need (albeit not all). Designed for headless use, easy configuration and industrial reliability.
http://www.arbetsmyra.dyndns.org/nard/
by rln
Wed Feb 15, 2017 11:05 am
Forum: Advanced users
Topic: rpiburn for automated PSU testing
Replies: 5
Views: 673

rpiburn for automated PSU testing

Introducing rpiburn , a new tool for heavy load power supply testing. This program will make a Raspberry Pi board to consume as much current as possible, but aborts if the processor becomes overheated, a brownout (under voltage) condition occur or something else bad happens. Testing can be conducted...
by rln
Tue Nov 08, 2016 9:50 am
Forum: General discussion
Topic: Live OS for Raspberry Pi..?
Replies: 9
Views: 1824

Re: Live OS for Raspberry Pi..?

kingneil wrote:Is there anything like a live OS for Raspberry Pi, where the entire thing is loaded into RAM..?
Yes, my Nard SDK does exactly what your asking for. It's a pure live OS (with Raspbian emulation).
http://www.arbetsmyra.dyndns.org/nard/
by rln
Sat Oct 08, 2016 3:32 pm
Forum: Troubleshooting
Topic: Disk I/O seems to freeze system
Replies: 7
Views: 1942

Re: Disk I/O seems to freeze system

Disk I/O is troublesome, but can be solved. I tried benchmarking my system with these two shell loops, both running simultaneously: while /opt/vc/bin/hello_video /boot/data/test.h264; do : done while dd if=/dev/urandom of=/sdcard/temp/myfile bs=1k count=10000; do sync echo 3 >/proc/sys/vm/drop_cache...
by rln
Mon Oct 03, 2016 5:56 pm
Forum: Advanced users
Topic: Large Scale Pi Management
Replies: 15
Views: 8390

Re: Large Scale Pi Management

Nard IS for local device install. What I meant was that instead of patching (which is error prone) you replace the OS one Pi at a time. Once this has been done everything is local.
by rln
Mon Oct 03, 2016 9:35 am
Forum: Advanced users
Topic: Large Scale Pi Management
Replies: 15
Views: 8390

Re: Large Scale Pi Management

I am looking to manage an environment that may exceed a 200 PI system. Has anyone explored in Raspian how we could do system management for users and patching An alternative to Raspbian can be my Nard distro. It is way easier to maintain in large scale environments. By design all Pis are always in ...
by rln
Fri Sep 23, 2016 11:07 pm
Forum: Advanced users
Topic: Pi3: NFS boot to RAM
Replies: 2
Views: 976

Re: Pi3: NFS boot to RAM

You might want to look at my Nard distro which boots to ram by default for cases like this. You can add bridge-utils from the Raspbian emulation add-on.
by rln
Thu Sep 15, 2016 9:25 am
Forum: Staffroom, classroom and projects
Topic: Lots of Headless Pi
Replies: 11
Views: 4355

Re: Lots of Headless Pi

What type of course is the classrom for? Headless would be great for high school and learning engineering. For elementary school it's likely to difficult.
by rln
Fri Sep 09, 2016 8:50 am
Forum: Troubleshooting
Topic: Disk I/O seems to freeze system
Replies: 7
Views: 1942

Re: Disk I/O seems to freeze system

Try mount a remotely shared disk via network. Either NFS or Samba. Does the stall occur then as well?
by rln
Mon Aug 22, 2016 9:41 am
Forum: Networking and servers
Topic: Possibility to boot via PXE and load filesystem into ram?
Replies: 15
Views: 4566

Re: Possibility to boot via PXE and load filesystem into ram

and thought of some small linux distributions. Would they still be too big because of the memory usage of the GPU? The development version of my Nard SDK might work. It's not entirely finished yet, but it can boot into a RAM standalone system. It's console based, but there is a framebuffer where on...
by rln
Fri Aug 19, 2016 12:07 pm
Forum: Troubleshooting
Topic: Raspberry pi restart to much and no ssh problems
Replies: 6
Views: 1117

Re: Raspberry pi restart to much and no ssh problems

If it happens with some RPi installations and not with others you have to find the differences (at the different places). This is exactly the reason for using a distro geared for embedded systems. Such a one will ensure all devices are always the same (softwarewise). Something that is hard to achie...
by rln
Wed Aug 17, 2016 7:22 am
Forum: General discussion
Topic: ADC for raspberry pi
Replies: 13
Views: 5030

Re: ADC for raspberry pi

To get jitter free (by which I mean sub-microsecond jitter) you will need to use DMA bit banging to get the SPI samples. DMA timing only works at the microsecond level from userland. You might be able to do better if you write a kernel driver. Thanks for the information. Do you happen to know if th...
by rln
Tue Aug 16, 2016 8:54 pm
Forum: Troubleshooting
Topic: Raspberry pi restart to much and no ssh problems
Replies: 6
Views: 1117

Re: Raspberry pi restart to much and no ssh problems

We have a lot of pi's running now, and now we learn that there are surtan problems with nice piece of computer for instance: We experience very much the fact that SSH is not more accesible , http no problem ... but nomore SSH , what results that somebody has to go there and do a reset ... You might...
by rln
Tue Aug 16, 2016 8:48 pm
Forum: General discussion
Topic: ADC for raspberry pi
Replies: 13
Views: 5030

Re: ADC for raspberry pi

You will be subject to scheduling jitter. If you want jitter free you'll have to write your own but you will only get of the order of 20ksps. Just what I was afraid of... I more or less expected I need to write my own driver. But why is the limit 20 kSps? Do you mean I can get higher if I accept ji...
by rln
Tue Aug 16, 2016 8:26 pm
Forum: General discussion
Topic: ADC for raspberry pi
Replies: 13
Views: 5030

Re: ADC for raspberry pi

I'm also interested in the exact same application (high speed magnetic sensor), so please let me know if you get it to work. :) The electric interface can likely be fixed somehow, though I'm more worried of a jitter free sample clock. The only way to acquire that is by DMA and a ringbuffer. I'm not ...
by rln
Mon Aug 15, 2016 8:46 am
Forum: Deutsch
Topic: Raspberry pi Os
Replies: 2
Views: 895

Re: Raspberry pi Os

Guten tag
Ich habt ein project Sie vielleicht sehen mögen:
http://www.arbetsmyra.dyndns.org/nard/
by rln
Sat Aug 06, 2016 2:35 pm
Forum: General discussion
Topic: SD Cards Blowing
Replies: 71
Views: 11359

Re: SD Cards Blowing

johnb_summers wrote: the cards dont last long
Use a distro where everything run from RAM, such as Nard SDK. It's is designed for robust 24/7 operation and industrial use. The SD card is only used for booting.
http://www.arbetsmyra.dyndns.org/nard/

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