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1082 discussions

Resending: EOMA68-A20, MD 1.7 severe Power Problems
by Pablo Rath 26 Jul '20

26 Jul '20

Resending without attachement: I am very sorry to inform everyone on this list that I had a severe power problem with my Micro Desktop 1.7. I applied power to the DC Jack and the area right to the jack burned out. (see attached picture). One thing that I noticed today was that UART worked when the card was powered up whilst attached to USB OTG alone (DC Jack on MD not connected)! But according to the wiki this should not work at all because of the Y6280 current control IC set at 1A acting as a diode in this case. When I applied power only to the MD I noticed that UART output was complete garbage (random characters). I don't know if only sometimes or everytime. When on DC power, board in FEL-mode with no card and pressing '2', then connecting USB OTG and booting U-Boot sunxi over FEL everything worked flawlessly. As I said I am very sorry that I screwed up. Luke, do you have any ideas what went wrong? Do you think this +also destroyed the computer card? If the error is on my side (embarassing but still the better +case) I will have to swallow the bitter pill that I screwed up badly. I am still going to cover the costs of computer card and MD so there will not be a financial loss to the project. I am very disappointed as I have made could progress. Had sunxi U-Boot, sunxi 3.4.104 kernel running and booting Debian Stretch rootfs... On the other hand if this is a general problem better we know it now and can take the necessary steps. Pablo ----- End forwarded message -----

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DDR3 RAM Design Rules and Techniques
by Paul Boddie 25 Jul '20

25 Jul '20

Hello, One thing that just came up in another forum is the matter of routing PCB tracks for DDR3 RAM, and this is probably a topic that was encountered by both the Pyra... https://pyra-handheld.com/boards/threads/analyzing-4gb-ram.81687/ https://pyra-handheld.com/boards/threads/is-there-really-a-light-at-the-end… ...and the EOMA68 initiatives. Is there any pertinent documentation describing this exercise in the EOMA68 board design process? Searching for DDR3 on the Rhombus Tech site [*] indicates that some boards were done with guidance (at some level) from the vendors: http://rhombus-tech.net/ingenic/jz4775/news/11jul2014_routing_completed/ http://rhombus-tech.net/allwinner/a31/news/ Previous discussions of KiCad and Olimex boards, which presumably involved DDR3 routing, can be found via this message: http://lists.phcomp.co.uk/pipermail/arm-netbook/2019-May/016062.html I ask about this in the context of someone who just made design files available for a board using the Ingenic JZ4780 that they had been working on. Those files are here: https://gitlab.com/igagis/cranberrypi Paul [*] http://rhombus-tech.net/cgi-bin/rhombus/ikiwiki.cgi?P=DDR3

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Current not intel Laptop/UMPC/Handheld Options
by Alexander Ross 25 Jul '20

25 Jul '20

Been wondering if theres any new products from the last say 2years? As i’ve not kept up with whats new else where. I know pyra is progressing and dare i say, nearly ready. For a laptop/umpc the more ram the better but a netbook size keyboard thats easy for large adult hands to type on. when i was a teenager i think keyboards like GPD pocket 1 where not so hard to type on but the pocket came at a time when i was at the end of teenage years and had grow more/fully and now i find it it bit awkward to type on, unlike my 10inch asus netboot. Any fav chrome books to librate? new handheld computers?, including intel cpus out of curiosity. like pyra, smaller or a bit bigger. or heck large laptops but not intel or amd? I do know of power cpu laptop projects. https://pyra-handheld.com/boards/forums/pyra-news.250/

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openpower virtual coffee
by Luke Kenneth Casson Leighton 23 Jul '20

23 Jul '20

https://openpowerfoundation.org/openpower-virtual-coffee-calls/ in 2 hours. conference call dial-in numbers at the above web page (which do not involve running non-free proprietary software to attend) these are an open informal chat, not recorded, no "agenda". topics have been thoroughly eclectic and enjoyable. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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2.7.4 preproduction sample, 1.7 MD, Questions
by Pablo Rath 22 Jul '20

22 Jul '20

I have recieved an EOMA68-A20 2.7.4 preproduction computer card and the 1.7 micro desktop (MD) last week. Just for clarification these boards are nothing new and have been discussed on this mailing list. If some of you already have their preproduction boards ready, I would appreciate any help, hints and suggestions to help me getting started. Altough I have some experience with handling arm-boards I am now afraid to do something **stupid** and break/fry the boards. After some digging in the list-archives I found this thread ([1]) where Richard and Luke discuss how to connect the bare computer card with the bare micro desktop. I have many questions: 1. Connecting computer card and micro desktop: I am aware of the photos attached to [2]. Does the mentioned video exist? Richard, did you send photos to Luke? (If yes, can I have them?) Luke, do you want me to send you photos too before apllying power? 2. PSU for micro desktop: According to the mentioned thread ([1]): "5.5mm jack with a 2.1mm centre hole, middle is +ve (aka "pin positive")", "Anywhere between 7 and 21v is fine, minimum 1A, 1 5A is better" So I searched for a DC PSU in my household and read Wikipedia where it is mentioned that OD 5.5 mm / ID 2.1 mm is common on guitar effect pedals but my multi guitar effect pedal PSU did not fit (ID too small). Finally I found a matching DC PSU from a low volatage guitar amp. It says O / P: DC 15V, 2A and a symbol (positive polarity): L. P. S. - -(.- + So I think this should be good to go. Can anyone please confirm. Thank you. Should we document this somewhere on rhombus-tech.net? 3. Soldering iron ready: I have my soldering iron ready. Richard, did you solder UART pins to the micro desktop ([3])? 4. SD-card ready / U-Boot Tried to compile u-boot-sunxi [4] and make exits with "System not configured". So Luke, what did you use as config or has something changed over the years? I also tried mainline U-Boot but could not find "EOMA68-A20-foo_defconfig" and "sun7i-eoma68-a20-foo.dts". What kind of defconfig and *.dts was used for the mainline U-Boot demos? My search of the mailing list archives and rhombus-tech was not futile. I could only dig up an old thread from 2014 where wookey was "assigned" to work on a minimal dts/dtb. 5. Git, notes and documentation Finally I am wondering where to put my notes. A subpage on rhombus-tech seems like a good idea good to me and indicates a work in progress in contrast to the various wikis out there. Where do you want me to push my work in progress git branches if I manage to hack something useful together? Pablo References: [1] http://lists.phcomp.co.uk/pipermail/arm-netbook/2019-July/016149.html [2] http://lists.phcomp.co.uk/pipermail/arm-netbook/2019-July/016154.html [3] http://lists.phcomp.co.uk/pipermail/arm-netbook/attachments/20190722/914a32… [4] http://rhombus-tech.net/allwinner/a20/boot/

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EOMA68 Computing Devices Update: Command Not Found
by Pičugins Arsenijs 07 Jul '20

07 Jul '20

https://www.crowdsupply.com/eoma68/micro-desktop/updates/command-not-found Note on the 'lsusb' thing: I personally like the 'dmesg -Hw &' command, it stays in the background and prints the dmesg info in realtime - in particular, letting you see detailed data about newly-connected devices.

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Re: [Arm-netbook] https://slashdot.org/story/20/06/23/1548205/amazon-unveils-2-billion-fund-to-invest-in-startups-building-sustainable-technology
by Luke Kenneth Casson Leighton 23 Jun '20

23 Jun '20

On Tuesday, June 23, 2020, Yehowshua <yimmanuel3(a)gatech.edu> wrote: > Sorry - meant to say I **just reached out. As in I sent them an email very cool. here, i am tempted to suggest riding on EOMA68 (and the much smaller miniature version, EOMA50) and that LibreSOC simply be put into Card form as part of a *range* of eco-conscious products. the reason for that is that the long-term environmental justification and e-waste savings for EOMA-compliant products is pretty clear cut and well understood, and the cost savings and benefits for endusers are also clear and easy to understand. http://rhombus-tech.net/whitepapers/ecocomputing_07sep2015/ LibreSOC *on its own* is just one component (a tiny one) that is below 5 percent of the BOM of any given eco-conscious product, and, in addition, LibreSOC processors can equally be used in eco-oblivious products. therefore as a minority component it has very little actual reduction in e-waste per-se.... *unless included in eco-conscious products*. and that's where the EOMA strategy comes in. l. (note: EOMA50 because it is based on re-use of 3.3mm CompactFlash Cards is much smaller and can fit into smartphones. EOMA68 which is creditcard size is just that little bit too big) -- --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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MNT Reform Campaign
by Paul Boddie 14 May '20

14 May '20

Hello, It got mentioned about two-and-a-half years ago on this list, but the MNT Reform campaign has finally begun: https://www.crowdsupply.com/mnt/reform Of potential relevance to those following EOMA68-related efforts might be various resources that the MNT Reform effort has made available: https://source.mntmn.com/MNT/reform Things like the PCB layouts, microcontroller firmware and case designs are published, although people have previously noted that Autodesk Fusion isn't a particularly libre-friendly format for the case designs. One could envisage adaptations of this for EOMA68-related purposes or something with similar objectives. Certainly, user-upgradeable functionality via an externally accessible PCMCIA-style slot (or similar, rather than the internal SO-DIMM slot) would surely be worthwhile exploring. Paul

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Re: [Arm-netbook] [Project question: EOMA68 Computing Devices] 1) battery replacements?
by lkcl . 09 Apr '20

09 Apr '20

On Thu, Apr 9, 2020 at 4:23 PM Crowd Supply <project-questions(a)crowdsupply.com> wrote: > > andrew.comly(a)protonmail.com submitted a question about your project, "EOMA68 > Computing Devices": > > battery replacements? > suppossing i buy this eOMA68 PFY Laptop Housing Kit for Computer Card along > with the Libre Tea Computer Card and use along with my , and use it everyday > for a few years. Then, as other netbook/laptop/tablet/android like things the > lithium battery dies. Do I have to buy a new kit? Why isn't the battery > replacement available on https://www.crowdsupply.com/eoma68/micro-desktop? > Where can one buy a replacement to the battery? hi andrew, it's a good question. i'm extremely busy at the moment, i'm ccing you to the list, which you can search where this was last discussed (a long while ago) and also where people will help. if you check the schematics and PDFs which you can find via the website, you'll find the battery part number and manufacturer. http://rhombus-tech.net/crowdsupply/ you do not need my permission or for me to be the "sole location from which that part is obtained". *however*... the supplier *may* require a MOQ of say QTY 100, and, as it has been a long time, may not respond at all (particularly the way things are now, world-wide). if you contacted them and say "i demand QTY 1" they may just get annoyed enough (being a wholesaler) so that *nobody* from Europe gets batteries in addition: the full CAD files are available. if you get really stuck, you can source your own battery. that's the whole point of the whole exercise. and if _you_ can't do it, you can contact the mailing list and find someone who can help you. best, l.

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Deja vu
by David Niklas 26 Mar '20

26 Mar '20

Hi luke, Linus (not Torvalds), mentions every project but yours when discussing this "lap dock", a laptop without internals to which you dock a device, such as a phone, or raspberry PI. It's known as the Nextdock2. https://www.youtube.com/watch?v=SIJAEcOL6sI It never ceases to amaze me how many copies of your project I come upon online. I almost think it is a great idea. :D Sincerely, David

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