[App_rpt-users] Fwd: RaspberryPi Compute Module

Wed Apr 9 21:37:37 UTC 2014

---------- Forwarded message ----------
From: Shane Morris <edgecomberts at gmail.com>
Date: Thu, Apr 10, 2014 at 7:37 AM
Subject: Re: [App_rpt-users] RaspberryPi Compute Module
To: Matthew Pitts <n8ohu at yahoo.com>

My guess is they want to go "deeply embedded" with this product - stuff
like washing machines, and cars, its not a computer, not on the outside,
but it has a computer in it, and a simple user interface on the outside.
Usually deeply embedded means you don't have ethernet, but of course, you
could design that into a custom I/O board.

In any case, its interesting to me, and I thought I'd highlight it to the
list, even if you can't use it for app_rpt applications, at the risk of
being OT, its good for other projects.

Thanks again!

On Thu, Apr 10, 2014 at 7:30 AM, Matthew Pitts <n8ohu at yahoo.com> wrote:

> Same Broadcom SoC, yes, but with a 4 GB eMMC module like a Beaglebone
> Black (or BeagleBone with the memory interface cape); the I/O board only
> provides the same basic capabilities as the Model A, rather than the
> features we are used to from the Model B. The Raspberry Pi Foundation
> included basic schematics for both boards, and it appears that we can
> design whatever sort of I/O board we want and the Compute Module with
> pre-installed OS just plugs into it.
>
> Matthew Pitts
> N8OHU
>
>
>
>   ------------------------------
>  *From:* Shane Morris <edgecomberts at gmail.com>
> *To:* Doug Crompton <doug at crompton.com>
> *Cc:* "app_rpt-users at ohnosec.org" <app_rpt-users at ohnosec.org>
> *Sent:* Tuesday, April 8, 2014 11:29 PM
> *Subject:* Re: [App_rpt-users] RaspberryPi Compute Module
>
> From what I understand, its the exact same specs, just a much more
> embeddable
> form factor for integrating into devices. You will also note there is no
> ethernet port by the looks of things. That could be a limiting factor in a
> few cases.
>
> Thanks!
>
> Sent from my iPad
>
> On 9 Apr 2014, at 1:04 pm, Doug Crompton <doug at crompton.com> wrote:
>
> Interesting but I don't think it will differ much in performance from the
> stock RPi just flexibility. The problem is the USB on the RPi and to some
> extent also on the BBB but I think the real problem is the app_rpt SW. Many
> other applications using the same resources  and bandwidths are running on
> these platforms using USB without the problems I am seeing with app_rpt.
> App_rpt is old code and in many ways outdated at least in the the IO area.
> Unless someone does a fairly extensive rewrite of the code I don't think it
> is going to happen on the Arm processors. There are periodic dropouts using
> USB (not associated with radio relax) even on PC processors it is just much
> more pronounced on the arm processors.
>
> When you run an Asterisk PBX on a RPi or BBB the CPU load is nil even when
> active. As soon as you introduce app_rpt even without radios (pseudo
> connections) or activity you see 20-30% CPU utilization. While the CPU
> utilization is not the main problem it sure does not help on a small
> system.
>
> I intend to keep plugging away at this but my expectations have been
> lessened. I am thinking of the possibility of an external USB interface,
> like Thelinkbox interfaced to asterisk might be a temporary fix. It
> apparently works well with USB on the ARM. This would also be an
> inexpensive way to connect remote radios to a server.
>
> If anyone has any ideas on this I would like to hear from you. There are
> several who have contacted me and perhaps we can form a group working
> towards a common goal.
>
>
>
> *73 DougWA3DSP http://www.crompton.com/hamradio
> <http://www.crompton.com/hamradio>*
>
>
> ------------------------------
> Date: Wed, 9 Apr 2014 07:42:25 +1000
> From: edgecomberts at gmail.com
> To: app_rpt-users at ohnosec.org
> Subject: [App_rpt-users] RaspberryPi Compute Module
>
> Hi list,
>
> Don't know if you had seen this:
>
> http://www.raspberrypi.org/raspberry-pi-compute-module-new-product/
>
> A RaspberryPi with 4GB eMMC in the size of a DDR2-SODIMM. Initial
> deliveries will be made with the I/O Board, later they will deliver the
> Compute Module in single quantities.
>
> There is a hard real time Xenomai Linux for RaspberryPi now, it is used
> with LinuxCNC. Add to this the fact that the GPU was finally open sourced,
> and if it weren't for that woeful USB performance, it'd be an alright
> machine.
>
> Doug, you may find this interesting, but as you have mentioned, you have
> been making better progress with the BeagleBone Black.
>
> Thanks!
>
> Shane.
>
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