Re: [ts-7000] Re: TS-76xx or BeagleBoard ?

["Didier Juges [ts-7000]" <>]

You can add the following to the list :)

The RPi Ethernet is actually routed from the CPU through the USB port. That has a tendency to make it unstable (disconnect for no reason). For some applications, that may be a problem. Some people have used it as an NTP server without problem though.

The RPi is running an ARM 11 core, which is getting old but the most significant difference between the RPi and the BBB is that the RPi is a completely closed architecture. The specs for the processor and GPU are unavailable to mere mortals and you cannot design a RPi compatible board because you cannot get the CPU specs. Even if you could, you cannot buy the CPU. I understand that some of the (video, maybe others) drivers necessary to run Linux on the RPi are proprietary, closed source.

On the other hand, the BBB is completely open and uses a more modern CPU (ARM v8) and all the design files are open source (software and hardware). You can design your own BBB clone based on the public design if you want to. You can do it and you won't go to jail.

The RPi is an amazing product at its price point, and the Raspberry Pi Foundation has done a great job which benefits so many people at so many levels (education, hobby, industrial and robotic, etc) that the world is a better place for it, but it is not necessarily the best solution for every problem.

Didier

On Thu, Oct 30, 2014 at 6:03 PM, [ts-7000] <> wrote:

 

How the BBB and RPi differ (a list subject to change/correction):
1) With the RPi the RAM is soldered on top of the CPU, a very critical technology only a few shops can offer.
2) The ARM1176JZF-S (RPi) is vfpv2 which supports floating point exceptions whereas the Am335x chip (BeagleBone) is vfpv3 and does not provide such support.
3) The RPi boots up via the VideoCore GPU whereas the BBB boots up normal.  This is one reason my linux-cnc friend (see below) gave up on using the RPi for his real-time stuff.

An engineer I know tried to use the RPi for linux-cnc but gave up and used the BB Black (if I remember correctly the main problem was the RPi booting up via the VideoCore GPU):
  http://blog.machinekit.io/

There are a few links for the RPi, BB, and Arduino near the top of this page:
  http://www.turbocontrol.com/monitor.htm

Thanks,
Paul

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Posted by: Didier Juges <>

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