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by Morgaine
Tue Jun 26, 2012 3:50 pm
Forum: General discussion
Topic: Invitation to order from RS
Replies: 575
Views: 87180

Re: Invitation to order from RS

Although it's clearly not vaporware because there are many thousands of people who really have received their boards, there is no doubt that the preorder process is an utter shambles, and the lead times quite ridiculous. I think people are just using the term 'vaporware' to express their extreme fru...
by Morgaine
Sun Jun 24, 2012 9:07 am
Forum: General discussion
Topic: Invitation to order from RS
Replies: 575
Views: 87180

Re: Invitation to order from RS

The STM32F4 is rather heavily subsidised. The distributors probably make about £9.96 on it. You can't infer how much the distributor makes from the fact that a product is subsidized. It's very common for prototyping boards to be subsidized in order to promote use of the chip. For example you'll fre...
by Morgaine
Sat Jun 23, 2012 11:50 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

Good news from a competitor: Intel Releases Ivy Bridge Programming Docs Under Creative Commons License . In addition to helping bring the relevant Intel drivers into mainline kernel and allowing the community to keep them up to date with each new kernel release, this also has the very salutary effec...
by Morgaine
Thu Jun 21, 2012 2:10 am
Forum: General discussion
Topic: Invitation to order from RS
Replies: 575
Views: 87180

Re: Invitation to order from RS

RS and Farnell can't make money directly out of RasPi sales because it's intended as an educational product from a charitable foundation and they'd get criticised. They hope to gain customers and raise their profile and make money on sales of related items. What ever are you talking about? Of cours...
by Morgaine
Tue Jun 19, 2012 9:39 pm
Forum: General discussion
Topic: Invitation to order from RS
Replies: 575
Views: 87180

Re: Invitation to order from RS

I wouldn't mind so much if my credit card hadn't been debited so rapidly. RS's debiting of credit cards at the time of order (according to their FAQ) and months ahead of delivery is very concerning. They're treating interest on customers' preorder money as a revenue stream. In effect, the Pi from R...
by Morgaine
Sun Jun 17, 2012 4:43 am
Forum: General discussion
Topic: Invitation to order from RS
Replies: 575
Views: 87180

Re: Invitation to order from RS

RS's preordering schedule seems to be suffering badly. You'd expect them to be roughly the same as Farnell, but whereas Farnell has promised that everyone who registered an interest before 18th April would get their Pi before end of June, look at RS's schedule: Registration date Estimated Invited to...
by Morgaine
Sun Jun 10, 2012 4:31 pm
Forum: Troubleshooting
Topic: 8000 interrupts per second when idle!
Replies: 141
Views: 55519

Re: 8000 interrupts per second when idle!

In a nutshell, this SoC wasn't designed for use in a networked general purpose computer with multiple USB devices, and the continuous clock-driven polling of the USB tries to make up for it, but poorly and with high overhead. Does Broadcom provide a more useful version of this device containing a bu...
by Morgaine
Sun Jun 10, 2012 6:36 am
Forum: Troubleshooting
Topic: 8000 interrupts per second when idle!
Replies: 141
Views: 55519

Re: 8000 interrupts per second when idle!

I think that's the issue here isn't it though? Lack of proper documentation, ... Yep, I agree fully there. Without reasonable documentation on hardware APIs, it's in the lap of the gods how good FOSS code can ever be, even with very dedicated and competent reverse-engineering effort. You simply can...
by Morgaine
Sat Jun 09, 2012 10:54 am
Forum: Troubleshooting
Topic: 8000 interrupts per second when idle!
Replies: 141
Views: 55519

Re: 8000 interrupts per second when idle!

dom wrote:(My knowledge on this is pretty limited. We bought in a block of hardware and got with it the dwc_otg linux driver. No one at Broadcom knows in detail how it works.)
Never put yourselves at the mercy of closed software. It always bites you eventually.
by Morgaine
Mon Jun 04, 2012 8:50 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi and 3D Printers
Replies: 13
Views: 14502

Re: Raspberry Pi and 3D Printers

@mgburr: Given the fumes emitted by the filament extrusion process, I certainly won't want my 3D printer to live in the same room as humans nor environmentally sensitive computers with spinning disks, so networking it makes sense on physical and health grounds too. What's more, the fact that the Pi ...
by Morgaine
Mon Jun 04, 2012 8:33 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

AlArenal wrote:So it all comes down to the real problem being a problem of many ifs that lie an unknown number of years in the future.
There's no ifs about it.

Commercially-funded activity always ceases when the commercial benefits from it end. Community activity does not.
by Morgaine
Mon Jun 04, 2012 3:49 am
Forum: Networking and servers
Topic: IBR Bundle Protocol (RFC5050) implementation
Replies: 3
Views: 2078

Re: IBR Bundle Protocol (RFC5050) implementation

Thanks Jisi. I drilled down into your links and read around the basics of the subject, very interesting indeed. It reminded me that IP protocols were created with disruption tolerance in mind in the first place, although the specter of those times never really materialized. Less happily, it also bro...
by Morgaine
Fri Jun 01, 2012 2:53 am
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

Pickle wrote:The real problem is when the hardware goes into EOL and all support from broadcom will vanish and users are stuck with binaries that will break with other open source software (i.e kernel and X) that continues to advance.
Very good point there, Pickle, which I had not brought up.
by Morgaine
Thu May 31, 2012 9:09 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi and 3D Printers
Replies: 13
Views: 14502

Re: Raspberry Pi and 3D Printers

I really don't follow your argument there as it's a load of disconnected statements, and what you say about the Pi and networking is just plain wrong. The Pi is currently the cheapest board that provides a complete Linux system with full networking, and all the software needed to link a Linux system...
by Morgaine
Wed May 30, 2012 5:52 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi and 3D Printers
Replies: 13
Views: 14502

Re: Raspberry Pi and 3D Printers

for RepRap it would be more beneficial to add the networking interface to the RepRap electronics than using the Pi as the interface. That's exactly what adding a Pi to an existing Arduino-driven RepRap printer achieves. The Pi does the nextworking while the Arduino does the realtime control. The ke...
by Morgaine
Wed May 30, 2012 1:56 am
Forum: Automation, sensing and robotics
Topic: Raspberry Pi and 3D Printers
Replies: 13
Views: 14502

Re: Raspberry Pi and 3D Printers

A Pi can't by itself replace the Arduino in a RepRap-type 3D printer, as it doesn't have sufficient hardware interfaces. Since you would have to give the Pi additional external interfaces to be able to handle the job, you might as well let the Arduino do that hardware interfacing in the first place,...
by Morgaine
Tue May 29, 2012 5:13 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

There is also a second issue that arises from not opening the API docs. If the low-power design secrets are so shallow that they can be inferred from the API, you may also be missing out on important opportunities for SoC and software improvement through community contribution too. Don't forget what...
by Morgaine
Mon May 28, 2012 5:18 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

I'm not talking internal design specs. But to write software on the GPU that actually is worth writing, you would need to know all the register settings, how to use then, and that immediately gives insight in to how it all works. In addition, you would need the instruction sets of the vector cores,...
by Morgaine
Sat May 26, 2012 11:06 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

Sure, but that's not API-level detail. I've never heard a FOSS developer ask for full internal design specs for a chip. While I'm sure that some are interested and intrigued by everything on principle, it's not what open source developers need to develop effective code. What they need is only the le...
by Morgaine
Sat May 26, 2012 10:16 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

@JamesH I'm not an expert in this, but isn't what you tell about BC's perspective on why to keep things secret like if you said anyone could make their own similarly energy efficient ARM core clone just by looking at the architecture reference manual? Is reverse engineering really that "easy"? Just...
by Morgaine
Sat May 26, 2012 7:08 am
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

As far as saying "these are the registers, this is what they do, this is the high level breakdown of the GPU, this is how it works", you're only gonna get that if you live in a dream world. Open source developers don't need all that, they only need the interface specs. The interface specs include n...
by Morgaine
Sat May 26, 2012 5:13 am
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

And I am afraid that commercial secrets is a big part of that. There is a lot of very clever IP bound up in the hardware and the software that runs it (remember this is the lowest powered GPU per performance measure in the world - just that is worth a shed load of money). Giving it to a competitor ...
by Morgaine
Fri May 25, 2012 8:35 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

If the nice engineers at broadcom would be kind enough to implement OpenCL for us all then I suspect all the complaints would disappear. My first inclination was to reply "Yes indeed!". A nanosecond later I realized that any such implementation would unavoidably have bugs which we could not fix our...
by Morgaine
Fri May 25, 2012 2:03 pm
Forum: C/C++
Topic: Recommeded C++ dev environment ?
Replies: 108
Views: 78348

Re: Recommeded C++ dev environment ?

it's the people who never study computer science due to being intimidated by the first steps I'd like to fix. Me too, and my reason for it is the same as Eben gives, that I witnessed personally the very bad drop in technical literacy among degree course applicants back when I was in UK academia. No...
by Morgaine
Fri May 25, 2012 3:13 am
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 45809

Re: GPU Processing API

If the Raspi sells > 10M units I will be truly flabbergasted. It's the Foundation's plan to get Pi into the hands of youngsters, and there are a lot of youngsters around. Even if you narrow the audience down to a small percentage that might be interested, you still get huge numbers. 10M isn't a lot...

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