arm-netbook December 2019

arm-netbook@lists.phcomp.co.uk

5 participants
8 discussions

Schematic and PCB layout CAD files
by Arun Isaac 01 Feb '22

01 Feb '22

Hi, Are the schematic and PCB layout CAD files for the EOMA68 computer card and the various housings available for download? I'm wondering if I can fabricate some of the housings on my own using a CNC mill. Hence, my interest in them. Sorry I had to ask. I searched very hard through the crowdsupply page and the rhombus-tech site, but couldn't find them. Thanks, Arun.

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EOMA68 Computing Devices Update: Measurements and a Hypothesis
by Paul Boddie 24 Jan '20

24 Jan '20

Hello again, I saw the latest update when it was issued a few days ago, with these details being particularly important: "PCBs are etched with acid, and when the tracks or pads are particularly close together (such as with BGA balls), not enough acid gets in to eat away the copper, and (in a very indirect way) the BGA pads end up being far larger than they should be. This, in turn, means that when the IC is put on the PCB and heated up, the BGA balls (which are made of solder) will spread out much farther, and potentially even spread so far that they contact each other and short out." https://www.crowdsupply.com/eoma68/micro-desktop/updates/measurements-and-a… >From what it says, it rather sounds like same (or a similar) problem is being encountered as the one which happened with the Ingenic JZ4775 boards: "When the first 6 samples were done, only one was found to be working: for some reason the DDR3 BGA solder balls had spread and caused short circuits. One of the samples was still with the factory, and that too was found to have shorts. Mike has been extremely helpful, and this is the first time that he's been involved with BGA, where his uncle's factory has been the one that assembled the samples." http://rhombus-tech.net/ingenic/jz4775/news/EOMA68-jz4775_XRay_Photos/ At that point in time, I don't remember any more news about resolving the matter, and with the campaign being finalised the priority was no longer to get these boards working. But perhaps one of these situations informs the other, or maybe they inform each other somehow. Thanks in any case for keeping us updated! Paul

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Libre RISC-V -- I mean OpenPower M-Class GPU update
by David Niklas 03 Jan '20

03 Jan '20

Not that I haven't complained about RISC-V's seeming, now proven, lack of openness from the beginning, but did you ever find out why they restricted access to people with UC Berkeley associations? It can't be: the license, newbie complains, IP theft concerns, etc., I give up. I would have asked them point blank, myself and put it in the update. It's counter productive to their stated goals. Thanks, David

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Re: [Arm-netbook] [Libre-silicon-devel] [OT only slightly] STEAM Camp OpenSourceEcology 22jan2020 for 9 days
by Luke Kenneth Casson Leighton 31 Dec '19

31 Dec '19

(removing lots of unnecessary ccs, particularly the FOSDEM visitor list) On 12/31/19, Marcin Jakubowski <marcin(a)opensourceecology.org> wrote: > Luke, any thoughts on you stepping up and coordinating the maskless stepper > module of this crazy evolution? as we (privately) discussed yesterday, there are 4 levels of NDAs: HDL tools, VLSI tools, Cell Libraries and Foudries. i'm waaay overloaded by dealing with level 1 heavily and interacting with people at level 2 and 3. david and the libre-silicon team are dealing with level *4* heavily, level 3 in a big way, and interacting with people at levels 2 and 1. they're the best people for this. l.

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Re: [Arm-netbook] [OT only slightly] STEAM Camp OpenSourceEcology 22jan2020 for 9 days
by Luke Kenneth Casson Leighton 31 Dec '19

31 Dec '19

guuuys i _did_ say don't crosspost. did i say don't crosspost? i did say, "don't crosspost". armnetbooks is ok because it's such a weirdly eclectic and topic-tolerant list. fosdem mailing list for visitors? mmmm... no. l. On Tuesday, December 31, 2019, pavel(a)noa-labs.com <pavel(a)noa-labs.com> wrote: > Are 1um masks that expensive (compared to the rest of setup)? Or is it has > more to do with turnaround times? > > Can you share details of a light source and resist? One important thing > will be to pick light source that will not burn the LCD matrix, and will > not be absorbed by the glass much. Making a custom made LCD with special > materials might not be that cheaper that sticking with masks for the > beginning. > > It will be truly great if one can just replace the mask with LCD with no > extra work > > Sent from my Huawei Mobile > > > -------- Original Message -------- > Subject: Re: [Libre-silicon-devel] [OT only slightly] STEAM Camp > OpenSourceEcology 22jan2020 for 9 days > From: David Lanzendörfer > To: Libre-RISCV General Development ,Linux on small ARM machines , > Libresilicon-developers@list.libresilicon.com,fosdem@lists.fosdem.org, > libresilicon-developers(a)list.libresilicon.com > CC: Alasdair G Kergon ,Marcin Jakubowski > > > Hi > My idea was to use an LCD plus a lens system in order to build a mask less > stepper unit for manufacturing semiconductors. > This way the costs for the mask sets would fall away and you would suddenly > be able to provide something like a pooling service for semiconductors. > > What do you think? > > Something worth combining your brain power over in those said 9 days? > > Cheers > -lev > > On Tuesday, 31 December 2019 4:42:10 PM HKT Luke Kenneth Casson Leighton > wrote: > > apologies for the cross-list post, the topic is very likely to be of > direct > > or indirect interest, please do share elsewhere, however for questions > > please do reach out directly to Marcin from OSE rather than crosspost > > replies! > > > > the OpenSourceEcology Project is running a hands-on real-time > collaboration > > and training course for 9 days that happens to have one of its camps in > > Ghent, Belgium, only around an hour by train away from FOSDEM and running > > up to overlap with FOSDEM only on its last 2 days, Feb 1st and 2nd, 2020. > > > > https://www.opensourceecology.org/steam-camp-january-2020/ > > > > Marcin's Ted Talk is here: > > https://www.ted.com/talks/marcin_jakubowski_open_ > sourced_blueprints_for_civi > > lization?language=en > > > > it is the beginning of a practical real-world bootstrap process for a > > modern civilisation and actually uses and puts into use everything that > we > > love about FOSS and FOSH. > > > > participants will get to actually *make* a 3D Printer, a CNC milling > > machine, then use those to fabricate an Arduino PCB which... you get the > > idea. a battery operated welder will also be one of the hands-on > projects. > > > > Alasdair, an idea just occurred to me: can we discuss privately, they are > > doing "remote" collaboration: is there room / time for OSE to book a > > workshop by remote link, for two reasons: one in case FOSDEM attendees > are > > interested to see what is going on, but secondly, if anyone who attends > > STEAM would like to keep in touch whilst attending FOSDEM? Can we discuss > > off-list(s)? > > > > best, > > > > l. > _______________________________________________ > Libresilicon-developers mailing list > Libresilicon-developers(a)list.libresilicon.com > https://list.libresilicon.com/mailman/listinfo/libresilicon-developers > > -- --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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[OT only slightly] STEAM Camp OpenSourceEcology 22jan2020 for 9 days
by Luke Kenneth Casson Leighton 31 Dec '19

31 Dec '19

apologies for the cross-list post, the topic is very likely to be of direct or indirect interest, please do share elsewhere, however for questions please do reach out directly to Marcin from OSE rather than crosspost replies! the OpenSourceEcology Project is running a hands-on real-time collaboration and training course for 9 days that happens to have one of its camps in Ghent, Belgium, only around an hour by train away from FOSDEM and running up to overlap with FOSDEM only on its last 2 days, Feb 1st and 2nd, 2020. https://www.opensourceecology.org/steam-camp-january-2020/ Marcin's Ted Talk is here: https://www.ted.com/talks/marcin_jakubowski_open_sourced_blueprints_for_civ… it is the beginning of a practical real-world bootstrap process for a modern civilisation and actually uses and puts into use everything that we love about FOSS and FOSH. participants will get to actually *make* a 3D Printer, a CNC milling machine, then use those to fabricate an Arduino PCB which... you get the idea. a battery operated welder will also be one of the hands-on projects. Alasdair, an idea just occurred to me: can we discuss privately, they are doing "remote" collaboration: is there room / time for OSE to book a workshop by remote link, for two reasons: one in case FOSDEM attendees are interested to see what is going on, but secondly, if anyone who attends STEAM would like to keep in touch whilst attending FOSDEM? Can we discuss off-list(s)? best, l. -- --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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Once upon a time you suggested building an opensource router
by David Niklas 29 Dec '19

29 Dec '19

Hi luke, I don't think that you created one because it would have not been capable of 1000Mb ethernet, though most people in the US have 100Mb or less internet. The company friendly elec has decided to do so: https://www.friendlyarm.com/index.php?route=product/product&product_id=274 A brief overview: H3/H5 powered 512MB RAM. Advertised as gigabit capable, but not actually able to do this with just TX: 230Mbps and RX 334Mbps on the second port (the first runs at almost the correct speed). The minimal config without wall brick PSU and PSU cable (USB) goes for $19.99. Thought you would be interested, David

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Dear luke, what do you think of North American PCB fabs?
by David Niklas 13 Dec '19

13 Dec '19

Hi luke, Today I got an email from allaboutcircuits and it was not an article (what I subscribed for), but an advertisement for a "deal" that Advanced Circuits (www.4pcb.com) was running. I don't have a thing to make, but thought of you and wondered if such companies really do give good deals and are nice to work with. They advertise "free" software that's not GPL so I'm unimpressed but other prospective customers would be. The "deal" was 50% off fist and second orders up to $250 and for businesses, up to $500 off PCB orders with a promo-code (Of course, nothing is "free" and they'll have to make it back somehow). You see, at some point in time (I'm guessing 2+ years at least), I'm going to have to not roll my own and instead use a real PCB fab so I'm keeping my eyes open. Thanks, David

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arm-netbook December 2019