arm-netbook January 2020

arm-netbook@lists.phcomp.co.uk

6 participants
4 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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about Risc-V and Power,
by zap 04 Jan '20

04 Jan '20

Isn't Risc-V supposedly supposed to be more secure and isn't open power based on the old risc? I am just wondering, if the level of evils risc-v has done, justifies abandoning usage of it when you could just as easily do some risc-v processors with or without their help and moreover, power, doesn't it require an immense, even crazy amount of watts? I guess my point is, they use more battery power than intel even. And intel is bad enough. Supposedly though I thought anyone could make risc-v processors as long as they dont use the trademarks. That being said, I noticed you guys have been quiet for a while. I hope you guys are doing well. :) I also hope you can reach your goal, who knows, maybe you can do twice what you thought someday with even 1W used only while being run. If I am misunderstanding something, feel free to let me know, I just think making a line of Risc-V based processor is the way. Libre of course, but yeah... and yes I saw your update.

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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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arm-netbook January 2020