arm-netbook May 2017

arm-netbook@lists.phcomp.co.uk

47 participants
94 discussions

ZEOMA Datasheet Hosting
by Alexander Ross 29 May '17

29 May '17

My friend that provided me with some hosting space to play with, is clearing up and with that my hosting space is coming to an end. I’ve made a copy of all the files for the zeoma project and will be uploading them to a gitlab group or https://www.archive.org

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Re: [Arm-netbook] libre 64-bit risc-v SoC
by David Niklas 29 May '17

29 May '17

On Mon, 8 May 2017 09:42:36 +0200 "mike.valk(a)gmail.com" <mike.valk(a)gmail.com> wrote: > 2017-05-07 22:26 GMT+02:00 <doark(a)mail.com>: > > > I apologize for DOS'ing the list, I can only get online about once a > > week. > > > > On Fri, 28 Apr 2017 13:58:57 +0100 > > Luke Kenneth Casson Leighton <lkcl(a)lkcl.net> wrote: > > > > > > On Fri, Apr 28, 2017 at 12:47 PM, mike.valk(a)gmail.com > > > <mike.valk(a)gmail.com> wrote: > > > <snip> > > > > I think/hope FPGA's are more efficient for specific tasks then > > > > CPU/GPU's > > > > > > you wouldn't give a general-purpose task to an FPGA, and you > > > wouldn't give a specialist task for which they're not suited to a > > > CPU, GPU _or_ an FPGA: you'd give it to a custom piece of silicon. > > > > I always thought that FPGA's were good for prototyping or small fast > > tasks... But that's just how I learned about them. > > > > Don't think of what you were thought. Think of what you can do which has > not been thought. > > The world outside the box is bigger than the on inside the box ;-) Don't I know :) Linux Linux +-------+ Linux | | Linux |WINDOWZ| Linux | | Linux +-------+ Linux Linux Linux > > > > > in the case where you have something that falls outside of the > > > custom silicon (a newer CODEC for example) then yes, an FPGA would > > > *possibly* help... if and only if you have enough bandwidth. > > > > > > video is RIDICULOUSLY bandwidth-hungry. 1920x1080 @ 60fps 32bpp > > > is... an insane data-rate. it's 470 MEGABYTES per second. that's > > > what the framebuffer has to handle, so you not only have to have the > > > HDMI (or other video) PHY capable of handling that but the CODEC > > > hardware has to be able to *write* - simultaneously - on the exact > > > same memory bus. > > > > > <snip> > > Your number seemed off to me so I did the math: > > 1920*1080*60*4 == > > 497,664,000 > > You're off by almost 30 MiB. > > > > 497,664,000 ~= 498 MB (Units of 1000) > 497,664,000 ~= 475 MiB (Units of 1024) <snip> \me embarrassed. Sincerely, David

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$150 taobao knock-off 3d printer doing 200mm/sec
by Luke Kenneth Casson Leighton 29 May '17

29 May '17

https://www.youtube.com/watch?v=3IGQ_8K3tGI this is a quick video of the horribly cheap and cheerful taobao $150 plus $40 shipping 3d printer making a HELL of a racket, successfully PRINTING at 200 mm / sec. acceleration settings have been turned up to... enormous: 4000 mm / sec^2 for X and Y, and 9000 mm / sec^2 for the extruder. in previous tests i was running at 2000 mm / sec^2 and at 120 mm / sec print speeds there was clear signs of "bulging" along the 0.7mm wide screen bezel, where at the last moment the print head would slow down *but extrusion clearly didn't*, and instead of a nice line you get this "teardrop" effect. by putting the acceleration so insanely high that artifact *DISAPPEARS*. now, due to the bone-rattling speed the frame is clearly vibrating around, which results in this "wave" pattern as the printhead goes through this massive 180 reversal, *but*, i am amazed to find that the "wave" pattern stabilises after around 4mm and is not hugely noticeable anyway. it's basically outperforming the mendel90 for quality, yet still matching it for speed. i'm... absolutely astounded. still to consider is putting in some acrylic / MDF / hardboard surrounds that would stiffen up the frame. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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Re: [Arm-netbook] Existential 3D Printing Moments
by David Niklas 29 May '17

29 May '17

On Thu, 18 May 2017 22:02:03 -0400 Neil Jansen <njansen1(a)gmail.com> wrote: > > On Thu, May 18, 2017 at 8:42 PM, Luke Kenneth Casson Leighton > <lkcl(a)lkcl.net> wrote: <snip> > > a couple of things i forgot to mention, one is to emphasise the > > "bang-per-buck" part. [...] > > this kind of design assessment trick i've only ever heard being used > > by people who make beowulf clusters, the word "cluster" being the key > > word. > > Those are fun problems to solve. You're right that there are a lot of > variables, and many different approaches. And if you've got a few > important criteria like cost or time, it's easy enough to weed out the > bad ones. > > Speaking of Beowulf clusters .. Not to go too far off topic, but has > anyone given any thought to a Beowulf cluster of EOMA68's? I only ask > because if Intel and AMD are including so much proprietary crap between > you and the processor, it's only a matter of time before other > alternatives become important. The way I see it, the current Allwinner > based EOMA68's are great for doing what a tablet or netbook can do, but > it's not going to replace my workstation with 16GB of RAM (which I run > out of probably weekly before needing to restart, but that's another > story .. Windows and Chrome, I have no one to blame but myself there). > Anyway, assuming that the Linux kernel could scale to maybe 8-16 of > these little cores, and being that they're all upgradeable, it actually > seems like it could become a neat alternative for workstation usage. I > don't even see where cost would be that prohibitive, as workstations > actually get pretty expensive often surpassing $1000 USD. Are there > any hard realities that would prevent the EOMA68 from working in this > fashion? Any bandwidth issues or technical limitations? <snip> I was just researching browser memory usage for myself. The best one is opera, which is rather shocking (chromium does not open all the files, this seems to be due to an internal load limiter or timeout.): 482 local html pages with JS disabled: Opera 12 1024MiB Chromium ~2000MiB The story gets worse with FF, way worse (and the time it takes FF to render, OMG!) David

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Re: [Arm-netbook] modifying a 7 inch notebook cabinet to accept apc card
by ronwirring＠Safe-mail.net 27 May '17

27 May '17

-------- Original Message -------- From: Christopher Havel <laserhawk64(a)gmail.com> Apparently from: arm-netbook-bounces(a)lists.phcomp.co.uk To: Eco-Conscious Computing <arm-netbook(a)lists.phcomp.co.uk> Subject: Re: [Arm-netbook] modifying a 7 inch notebook cabinet to accept apc card Date: Thu, 25 May 2017 17:40:52 -0400 > Keyboard is easy if you know a little electronics. A laptop keyboard is a matrix keypad. Rows and columns. One key connects one row to one column. > > Look up a little thing called the "Teensy" -- it is a microcontroller board. You can (if you are very good at soldering) connect from the keyboard's PCB connector (cut the Can the teensy make the key mapping correct and the key mapping will be correct when arriving at the computer's usb port? PCB and solder to the connector while it's still on there -- no shorts, mind you, or it won't work, and the pin pitch is usually insane...) to a Teensy and make a "custom keyboard" that way. You will of course have to program the Teensy but that's the easy part ;) an Arduino Leonardo clone from eBay (also try to find, if you still can, Can you use a raspberry pi 0 to program a teensy? "Arduino Micro" clones -- NOT the "Pro Micro" ones, they won't have enough pins). Same code will run there and work just fine. > > Forget the battery, unless you have a reflow toaster oven (or other homemade reflow equipment, or access to the professional gear) -- you will need it for the kinds of chips that let computers talk to batteries, AFAIK. Too much trouble. > > I am designing, for a competition on Hackaday, a "made from common modules" "laptop" that I'm calling the AnyTop. The goal is that anyone can build it if they can use a screwdriver, knife, and some sort of drill. (The drill is only needed in one place.) It won't have a battery... but it will be a laptop form factor and it will work. Luke, would some discussion of this be on-topic? >

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why are notebook devices not usb?
by ronwirring＠Safe-mail.net 27 May '17

27 May '17

I have gotten to learn that about notebooks, devices like sound, keyboard, touchpad and camera are often proprietary. Why are they not usb devices? Is it because the manufacturer will not risk that others can provide spare parts or make a copy of his computer?

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Re: [Arm-netbook] usb keyboard, width about 15cm?
by ronwirring＠Safe-mail.net 27 May '17

27 May '17

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Re: [Arm-netbook] usb keyboard, width about 15cm?
by ronwirring＠Safe-mail.net 27 May '17

27 May '17

My post was inaccurate phrased. I should have written a wired usb keyboard, touchpad may be attached, having a width about 15cm. -------- Original Message -------- From: Christopher Havel <laserhawk64(a)gmail.com> Apparently from: arm-netbook-bounces(a)lists.phcomp.co.uk To: Eco-Conscious Computing <arm-netbook(a)lists.phcomp.co.uk> Subject: Re: [Arm-netbook] usb keyboard, width about 15cm? Date: Fri, 26 May 2017 13:04:27 -0400 > eBay has a bunch but they're all cheap nasty Chinese Bluetooth jobs. > _______________________________________________ > arm-netbook mailing list arm-netbook(a)lists.phcomp.co.uk > http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook > Send large attachments to arm-netbook(a)files.phcomp.co.uk

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Re: [Arm-netbook] mali gpu reverse engineering lkcl may ignore
by ronwirring＠Safe-mail.net 26 May '17

26 May '17

-------- Original Message -------- From: Luke Kenneth Casson Leighton <lkcl(a)lkcl.net> Apparently from: arm-netbook-bounces(a)lists.phcomp.co.uk To: Eco-Conscious Computing <arm-netbook(a)lists.phcomp.co.uk> Subject: Re: [Arm-netbook] mali gpu reverse engineering lkcl may ignore Date: Thu, 25 May 2017 21:48:05 +0100 > folks, it's very interesting to note this discussion as being very (visually) > difficult to read, because normally i reply to pretty much every discussion > and i take particular care to do inline posting and to cut unnecessary > context (as is being done here)... but also, from experience, > it would seem that i do quite a bit more than that. > > what i *also* tend to do is to tidy up the sentences adding line-breaks > as well as carriage-returns that separate out the paragraphs. this I will shorten lines. > helps the people who reply to be able to not only identify the different > people in the conversation but also it helps their mailers to add in > the correct level of additional indentation - the ">"s before each > line. > > now, if you *don't* do that, then you end up with an absolute mess: > one single ">" per paragraph... but you can't identify it visually > because there's *no paragraph breaks*. > > ron, it is *almost impossible* to identify what you've written, thus making > it much harder to understand what you want to say, and thus leading > directly to the confusion and lack of clarity that you're experiencing. > > if you would like your ideas to be easier to understand perhaps you > might consider switching to "plain text only" mode in your email client I always write in plain text. If I do not, it is a mistake. > and to re-read any online netiquette rules for email lists once again, paying > particular attention to layout and the use of whitespace in replies. > > l. > > On Thu, May 25, 2017 at 9:38 PM, <ronwirring(a)safe-mail.net> wrote: > > > -------- Original Message -------- > >> On Wed, May 24, 2017 at 03:07:45PM -0400, ronwirring(a)Safe-mail.net wrote: > >> > If you reinterpret what I write then tell on what grounds. I think lkcl's reasons for not reverse engineering a mali are right. > >> It is difficult to follow your argumentation. You write that you agree > >> and disagree in the next sentence. > > No, I do not. > > _______________________________________________ > arm-netbook mailing list arm-netbook(a)lists.phcomp.co.uk > http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook > Send large attachments to arm-netbook(a)files.phcomp.co.uk

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usb keyboard, width about 15cm?
by ronwirring＠Safe-mail.net 26 May '17

26 May '17

I have searched the best I can for a seller of a small usb keyboard. Width about 15cm. Keyboard may include a touchpad. I cannot find a seller. I have asked on forums. No answers. http://usb.brando.com/prod_detail.php?prod_id=00666 Seller says, he has stopped selling the keyboard and he does not know where a keyboard of this size is being sold. Do you know if I can buy a keyboard of this size? Thank you.

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arm-netbook May 2017