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New Raspberry Pi Model B+

rephlex Re:USB Bandwidth & Power Problem (202 comments)

The Raspberry Pi's USB problems have been reduced but they will never be totally solved.

about 2 months ago
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New Raspberry Pi Model B+

rephlex Re:Does it have audio in yet? (202 comments)

You could use a USB microphone.

You could and it might work, but it might not since the Raspberry Pi has problems with USB and isochronous transfers are particularly problematic.

about 2 months ago
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Broadcom Releases Source For Graphics Stack; Raspberry Pi Sets Bounty For Port

rephlex Re:is the USB 'bug' fixed, at this point? (77 comments)

No, they haven't completely resolved the multiple bugs with USB on the Raspberry Pi and I don't expect they ever will. Some of them seem to be completely unsolvable in software..

Incidentally, they've just started a beta test of the latest round of USB fixes: http://www.raspberrypi.org/php...

about 6 months ago
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NVIDIA Demos "Digital Ira" With Faceworks On Next-Gen SoC, Under Ubuntu

rephlex Re:Tegra 5 is already obsolete (45 comments)

Tegra 5 gives Nvidia the chance to demonstrate their new ARM strategy of fusing 64-bit ARM cores (ARMv8 - desktop class) with PC-class AAA GPU cores

Tegra 5 uses ARM's A15-Cortex 32-bit ARMv7 core. Tegra 6 will be Nvidia's first SoC to use their custom designed 64-bit ARMv8 core.

about a year ago
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Raspberry Pi, Smart Highways Win World's Biggest Design Prize

rephlex Re:How can the Pi win this award when there are... (91 comments)

If I wasn't interested I wouldn't have asked the question. I'm definitely not the only person who is curious about this situation.

1 year,14 days
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Raspberry Pi, Smart Highways Win World's Biggest Design Prize

rephlex Re:How can the Pi win this award when there are... (91 comments)

Thanks for replying, but you didn't answer my question. I want to know why you are no longer a Raspberry Pi Foundation trustee. Why did you resign?

1 year,15 days
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Ouya Performance Not Particularly Exciting

rephlex Re:Open Console (305 comments)

This simply isn't true. XBMC on the Raspberry Pi is actually a rather poor experience. The Ouya is reputed to be powerful enough to decode H.264 in at least 1080p24 (using the ARM CPUs NEON instructions on all four of its cores) if need be, i.e. no video decode hardware acceleration necessary This ability might come in handy with some non-standard H.264 content that the Pi can't play.

about a year and a half ago
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Rhombus Tech 2nd Revision A10 EOMA68 Card Working Samples

rephlex Re:Definitions, please? (57 comments)

Future samples are approved for sale as a standalone product because "they boot", which obviously qualifies them to ship.

Isn't that the same criteria the Raspberry Pi Foundation used?

about a year and a half ago
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Raspberry Pi Production Heats Up In UK Surpassing Chinese Production Soon

rephlex Re:Oh Liz, arrogant arrogant Liz... (108 comments)

Liz can be just so incredibly abrasive sometimes. She once implied I was a lunatic when I complained about the Raspberry Pi's USB issues. How a person like her ends up doing PR is beyond me, although she appears to have done a good job with the media side of things.

about a year and a half ago
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The Raspberry Pi Turns One

rephlex Re:The aboslute best thing about the Pi... (81 comments)

Ok, so you're saying that it makes sense to risk frying a $500 laptop instead of a $25 Pi? Riiiight.

Only an idiot would connect something capable of damaging their computer directly to it. This is what opto-isolators are for.

And when you say "underpowered", that's because you hadn't realised that the SoC was designed to go into hi-def PVRs or BluRay players, so it has a muscular GPU, and the "underpowered" ARM CPU was an afterthought...and you haven't kept up with the news,

You're making an incorrect assumption. I say the Raspberry Pi is underpowered because there are similar SoCs available that have ARM Cortex A8 or A9 CPUs in them which are clocked higher than the older ARM1176JZF-S CPU in the Pi and which support the newer ARMv7 architecture versus the Pi's ARMv6. This is a big deal since ARMv7 CPUs can run at their full potential using standard armhf Linux distributions.

Also, the GPU in the Pi isn't as powerful as the Raspberry Pi Foundation would have people believe. Just look at the results Luc Verhaegen has achieved with the supposedly much weaker GPU in the Allwinner A10.

about a year and a half ago
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Open Source ARM Mali Driver Runs Q3A Faster Than the Proprietary Driver

rephlex Re:Well done Luc (71 comments)

Hey Luc, why not drop round the Raspberry Pi forum and tell them about this. As you know they are a friendly bunch of guys and will want to offer you their congratulations.

For the benefit of those who don't realize it, this is sarcasm. Read this and see both Eben and Liz Upton at their "charming" best and you'll understand: http://www.raspberrypi.org/archives/2221

It's a pity the mainstream media haven't mentioned these sorts of events which have occurred numerous times on their forums. The Raspberry Pi Foundation and the Raspberry Pi apologists ought to brace themselves though, the PR bubble and hype surrounding the Pi won't last forever. Eventually reality will prevail.

about a year and a half ago
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OUYA Android Game Console Available In June

rephlex Re:Ouya was more relevant, before. (196 comments)

The Ouya will provide a greatly superior XBMC experience I'm sure. XBMC is simply too sluggish to be truly usable on the Pi.

about a year and a half ago
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Google Gives 15,000 Raspberry Pis To UK Schools

rephlex Re:Mmm .... Pi (159 comments)

While there have been quality control problems recently which the Raspberry Pi Foundation has downplayed the USB issues are inherently a result of the notorious USB controller in the BCM2835 SoC that the Pi uses. They've actually just hired a Broadcom employee full-time now to address these problems after many months of complaints, see this thread: http://www.raspberrypi.org/phpBB3/viewtopic.php?t=30764&p=270951

They are long overdue in taking this issue seriously but better late than never. Hopefully they'll have some success but I would be extremely surprised if the isochronous transfer problems are ever solved.

about a year and a half ago
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Google Gives 15,000 Raspberry Pis To UK Schools

rephlex Re:Mmm .... Pi (159 comments)

Problematic is actually a good word to use to describe the Raspberry Pi. It certainly has problems, some of which will almost certainly go unsolved, e.g. its non-standard and woefully inadequate USB controller which can reasonably be characterised as being broken.

about a year and a half ago
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A Least Half a Million Raspberry Pis Sold

rephlex Re:Cubieboard (212 comments)

Your perception that one socket for power is better than another is ridiculous, BTW. A USB wall wart is no different to a wall wart with some 1.3mm connector.

I don't think he was referring to the physical design, rather to the very real issues regarding USB power. My argument is that if the Raspberry Pi was competently designed these issues would be much less of a problem than they are.

about a year and a half ago
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A Least Half a Million Raspberry Pis Sold

rephlex Re:What do I do with one? (212 comments)

Plenty of LCD displays don't have any digital inputs, believe it or not.

about a year and a half ago

Submissions

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Faulty Raspberry Pi's

rephlex rephlex writes  |  about 2 years ago

rephlex (96882) writes "Along with the ameliorated but still ongoing problems with USB on the Raspberry Pi it appears that the number of Raspberry Pi's shipped faulty appears to have significantly increased in the last month or so with one report on the forums from someone who claims that they recently received three faulty Pi's out of ten and another from a person who claims both of theirs are faulty. These reports have been described by Raspberry Pi Foundation representative who posts on their forums as jamesh as "statistically insignificant". This is the same person who incorrectly claimed in August that the Raspberry Pi was still in beta. There have also been recent reports of poor packaging with the damaged PCB unsecured and rattling around inside, solder bridges between header pins causing constant rebooting as well as multiple instances where PCB holes have been inconsistently filled with solder. See here:

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=22473
http://www.raspberrypi.org/phpBB3/viewtopic.php?f=23&t=24571"
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Serious problems with USB and Ethernet on the Raspberry Pi

rephlex rephlex writes  |  about 2 years ago

rephlex (96882) writes "The USB controller used in the Broadcom BCM2835 (which is the SoC the Raspberry Pi uses) has buggy drivers which have been causing problems for many of its users. In addition to this the Pi can only supply an unusually low amount of current to its USB devices, just 140 mA approximately, and using a powered hub to sidestep this limit exacerbates the issues caused by the USB drivers. Even Ethernet is affected as the Ethernet controller used on the Raspberry Pi is connected to the SoC via USB. This has resulted in packet loss and even total loss of network connectivity in certain situations, see https://github.com/raspberrypi/linux/issues/29. Attempts have been made in the past to fix the buggy USB drivers as there are other devices which use this problematic controller. None of these attempts seem to have achieved very much."
Link to Original Source
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Raspberry Pi USB power problems?

rephlex rephlex writes  |  more than 2 years ago

rephlex writes "There are multiple Raspberry Pi users on the official Troubleshooting forum experiencing hardware problems with their Pi. It appears the Raspberry Pi has problems with USB, specifically with powering peripherals that require 140 mA or more. That situation causes a voltage drop that results in the USB voltage becoming out of specification. This has resulted in malfunctions with USB devices such as Wi-Fi dongles, even when connected to the Pi via a powered hub. Also, there appears to be Ethernet problems caused by this "excessive" (but well within USB specifications) current draw: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=6&t=6037"
Link to Original Source

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