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microdesktop v1.7 arrived, works fine... but...
by doark＠mail.com 19 Apr '17

19 Apr '17

On Thu, 6 Apr 2017 06:12:16 +0100 Luke Kenneth Casson Leighton <lkcl(a)lkcl.net> wrote: > ok so the story goes like this: > > back in august 2016 i got the A20 card up and running with mainline > 4.7rc1 (or thereabouts), including patching in NAND support for a > proper mtd device. it worked... up to a point... except when u-boot > did a complete scan it CORRUPTED the NAND flash... just from reads. > > i figured this was "just software" as it's pretty experimental, and > the 3.4.104 sunxi-nand works perfectly. > > fast-foward to a few months ago, when i was testing the external > micro-sd slot, weirdly it resulted in a kernel segfault *from the > sunxi-nand driver*. i thought, "that's weird, might be to do with > current-fighting from the micro-desktop PCB not having level-shifting" > > sooo... that's now fixed: the micro-sd slot works perfectly through > the new revision 1.7 microdesktop's level-shifting IC. however i got > exactly the same kernel segfault in the sunxi-nand driver, so i > temporarily took it out of the kernel config, tested again, and yes, > the micro-sd worked fine. > > ... except that when i booted it up again, the nand flash had been > corrupted. now, bear in mind there's *NO DRIVER INSTALLED*. > > this is just too weird for me to deal with. not to mention, because > of the age of the A20's Boot ROM there is now a limited set of > "legacy" NAND ICs available i've had it with them. > <snip> I'm sorry to hear you are having trouble. Personally, I like the super weird Linux problems. Can I have one of those malfunctioning alpha boards to try to figure out what's going on? I grant you that I've never worked on something quite this low level before, so I won't be solving it any time soon, but it would be worth looking into just so that we don't have this problem again (yes, I would like to learn how to create SBCs). Thanks, David

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Fwd: Eurocircuits NEWS - Fantastic Q1-2017
by Luke Kenneth Casson Leighton 18 Apr '17

18 Apr '17

i don't normally like/forward this kind of stuff but just as a reminder, the shiny PCBs i did of the laptop were from this company. the pricing for the (very specific!) budget-end PCBs with 12mil vias, 10mil tracks and clearance and no green colouring was really *really* low cost, for europe: i was very surprised. also i was extremely impressed with the online viewer / gerber checker, it took a ton of hassle out of what would otherwise meant a manual process for them, which more than certainly is one of the reasons why they're affordable. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68 ---------- Forwarded message ---------- From: Eurocircuits <euro(a)eurocircuits.com> Date: Tue, Apr 18, 2017 at 9:28 AM Subject: Eurocircuits NEWS - Fantastic Q1-2017 To: Luke <luke.leighton(a)gmail.com> PCB services <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/NGzaHKIfCdeyt4…> | eC-Solutions <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/iVQmtsRh7639Jh…> To: luke.leighton(a)gmail.com, 75 Katwijkstraat, 2585VM Den Haag, Netherlands Dear Luke Leighton Eurocircuits NEWS - Fantastic 1st quarter of 2017 The New Year 2017 took a high flight right from the start. Customers were very active and Eurocircuits was filled with eager to launch new projects. Comparing the first quarter of 2016 and 2017 in PCB sales gives the following result: 1st quarter of the year 2016 2017 Customers 6 103 6 359 4,2% Orders 26 320 29 132 10,7% PCB sales 5 482 522 6 198 055 13,1% This proves to be a good start for the year. We will work very hard to continue to earn the trust of our continuously growing number of customers. Eurocircuits NEWS - Q1-2017 PCBA Visualizer launched in Beta Our Eurocircuits team was very exited to present our newest tool: PCBA Visualizer. Our PCB Visualizer tool for DRC/DFM analysis of the bare board has established itself as proven value to our customers. PCBA Visualizer or Assembly Visualizer is the natural extension of PCB Visualizer. PCBA Visualizer offers DRC-DFM functionality on the populated board even before anything has been produced thus allowing to fix mistakes at minimal cost. PCBA Visualizer has been received with a lot of fantastic feedback but also many questions about how you can utilise the PCBA Visualizer to save time and money by Verifying your Gerber data matches your Bill Of Materials (BoM) and Component Placement List (CPL), an early warning system to identify data issues and eventually resolve them online. You may have noticed when saving your offer the option to participate in our Beta testing In order to take advantage of this tool and understanding how you can benefit and correct your data please take 15 minutes to look at our PCBA Visualizer video below: <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/ToQmYRPKCoU7tZ…> If you have any questions about this or any other service please feel free to get in touch and we will be more than happy to help! Try out our online chat! Blogs *Company news* - Looking back at 2016 <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/FGuCoTARCvI763…> - New building in Eger - time laps video <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/DeKwwo763zVOGm…> *Production* - The Impact of Different Copper Thicknesses on the Cooling of a SMD-Voltage Regulator: technical page <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/z7630kqybMUfJA…> - Why you should supply us with Gerber X2 files? <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/O763Is0sX9pkqc…>: All on Gerber X2. *eC-tools* - SMS messaging <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/jTVjpRjmquGcKi…> for time critical orders - New Auto-repair function in PCB Visualizer <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/763PeKx42FHjd8…>: automatic repair solution for annular ring issues. *eC-equipment* - eC-placer <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/Ez7qM6qpa3Xwzu…>: fast, accurate PCB prototype assembly solution./li> If you would like us to produce a blog or white paper on a particular aspect of PCB manufacturing technology or PCB soldering, e-mail us at euro(a)eurocircuits.com Interact with us The best way to share ideas and knowledge is face to face. *Come and meet us at* - Check out our eC-calendar eC-calendar <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/2u6rKDqg87fYtG…> *Eurocircuits meets students* - TU Delft Solar Boat Team <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/koG5qJylRo763d…> – sponsored by Eurocircuits - STORM Eindhoven <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/ez892tduYfWixD…> – an interesting and successful student project - Eurocircuits’ PCBs in the most efficient urban concept hydrogen car of Green Team Twente <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/Aj763muwtPkO42…> *Eurocircuits N.V.* Antwerpsesteenweg 66, 2800 Mechelen, Belgium. Tel: +32 15 28 16 30 Fax: +32 15 28 16 31 Email: euro(a)eurocircuits.com Website: www.eurocircuits.com <http://relay.eurocircuits.com/sendy/l/sVzVSf8nL8whQSbMX05zfA/892u92h892pyCd…> If you don't want to receive updates. please unsubscribe <http://relay.eurocircuits.com/sendy/unsubscribe/7gUZsffeQO9mqTq7633T2xHBlD8…>.

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ZeroPhone
by Louis Pearson 18 Apr '17

18 Apr '17

https://hackaday.io/project/19035-zerophone-a-raspberry-pi-smartphone Not exactly a netbook, but this looks like an interesting project. How much work would it take to create something like this using EOMA68? I know I would be interested in a device like that.

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Re: [Arm-netbook] ZeroPhone
by dumblob 17 Apr '17

17 Apr '17

> > > Why not use the STM32F072 for audio on the laptop? > > not good enough dynamic range and quality, and it is still necessary > to have a amplifier. i tried doing audio on an STM32F103RBT6 - i > learned that it would not be enough. i *almost* managed it though. > http://www.henryaudio.com/ - the components used in this device would be my inspiration when it comes to audio quality

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microdesktop case, laptop pcb1 and pcb2, etc.
by Luke Kenneth Casson Leighton 16 Apr '17

16 Apr '17

https://www.crowdsupply.com/eoma68/micro-desktop/updates/taiwan-micro-deskt… ok so i'm almost ready to send the laptop pcb1 and pcb4 off for prototyping, this gets about 20% the way towards getting the laptop done, but also is planned to be the basis of a new housing (an all-in-one PC) where sharing the exact same main PCB as in the laptop will cut costs of production of both. mark (van de borre): about the casework i've sent the DXF files off to a china prototyping company just so i can get something quickly. i don't expect them to be perfect first time, and to have do do another iteration. i'll want to do one last full systems test then the microdsktop v1.7 including casework can go into production. i haven't worked out if i have to do 2,000 of the corner pieces as 3D-printed or to get them injection-molded, at 2,000 pieces it *might* be worth doing as injection-molding. btw if anyone would like to see the gerber files for the three latest pcbs, they're here: http://hands.com/~lkcl/eoma/laptop_15in/pcb1/laptop_15in_pcb1_cam/ http://hands.com/~lkcl/eoma/laptop_15in/pcb4/laptop_15in_powerboard/ http://hands.com/~lkcl/eoma/microdesktop/eoma68_microdesktop_cam/ l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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microdesktop v1.7 arrived, works fine... but...
by Luke Kenneth Casson Leighton 07 Apr '17

07 Apr '17

ok so the story goes like this: back in august 2016 i got the A20 card up and running with mainline 4.7rc1 (or thereabouts), including patching in NAND support for a proper mtd device. it worked... up to a point... except when u-boot did a complete scan it CORRUPTED the NAND flash... just from reads. i figured this was "just software" as it's pretty experimental, and the 3.4.104 sunxi-nand works perfectly. fast-foward to a few months ago, when i was testing the external micro-sd slot, weirdly it resulted in a kernel segfault *from the sunxi-nand driver*. i thought, "that's weird, might be to do with current-fighting from the micro-desktop PCB not having level-shifting" sooo... that's now fixed: the micro-sd slot works perfectly through the new revision 1.7 microdesktop's level-shifting IC. however i got exactly the same kernel segfault in the sunxi-nand driver, so i temporarily took it out of the kernel config, tested again, and yes, the micro-sd worked fine. ... except that when i booted it up again, the nand flash had been corrupted. now, bear in mind there's *NO DRIVER INSTALLED*. this is just too weird for me to deal with. not to mention, because of the age of the A20's Boot ROM there is now a limited set of "legacy" NAND ICs available i've had it with them. now, i _could_ convert to eMMC but it's too much of a major redesign: it involves disrupting the RGB/TTL tracks, and may require at least two more rounds of pre-production prototyping... ... it's too much: it's too risky... and i'm getting fed up. so. what i'm going to do instead is: cut the NAND IC entirely, then wire SDC2 (which is the same pins as the NAND) to the *ON-BOARD* Micro-SD card slot, instead. what that will give is *two* bootable Micro-SD card options, priority being first the external one (MMC0) and second the on-board one (MMC2). the reason why this will be possible when it was not possible before was described in another post to the list a couple weeks back: there's simply no way to route the tracks on such a small 6-layer PCB with the NAND tracks going from right-to-left, MMC0 has no room to go left-to-right and at the same time MMC3 going left-to-right. that's over 30 tracks trying to cross through space that will only take about 15. BUT... ... if the NAND tracks are *removed*.... *NOW* i can route MMC2 (right-hand-side of the A20 pins) to the on-board MicroSD slot (right of the Card). i can always do a variant which has eMMC later.... but right now i just want to get something out the door as soon as possible with as little risk as possible. this approach does have the advantage that the BoM is about $5 less.... but it does mean i will need to get something like... 1,000 MicroSD cards, instead! l.

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Where did you source the screens from?
by David Niklas 06 Apr '17

06 Apr '17

Hello, I was wondering where you bought the laptop displays from? Thanks, David

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please use libre services for public discussion and development of EOMA68 libre hardware and software
by Luke Kenneth Casson Leighton 03 Apr '17

03 Apr '17

>> https://github.com/normandc/EOMA68/tree/master/Microdesktop/Images > > normand, can you please not use non-free proprietary git services for > this project, it sends completely the wrong message. please delete > that github repository immediately, it brings the EOMA68 project's > reputation into disrepute and that's completely unacceptable. correction: if you wish to you use proprietary services for private (paid, subscribed, totally isolated from public view) use that's absolutely fine and is entirely your prerogative and decision, but if it's public and *especially* if it's for interaction with people on this list, thus giving the impression that the use of proprietary non-free services for the development of libre hardware and software is perfectly acceptable at this very early phase of the EOMA68 project, that's not an acceptable impression to make. sorry for not mentioning it earlier. l.

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microdesktop casework as DXF files for laser-cutting
by Luke Kenneth Casson Leighton 03 Apr '17

03 Apr '17

hi i'd like to introduce mark, one of the fosdem staffers, who runs a company http://lusis.eu and he has offered to do the micro-desktop casework. however first thing that's needed is: GPLv3-licensed DXF files! now, these need to be done as 3mm stacks, so that will be something like 7 separate DXF files. i _could_ do it but i'd like to give people the opportunity to be part of this project, first. we're gonna have to do the DXF files from PDFs (datasheets, PCB layout) and from looking at the photos of the prototype that was arranged by crowdsupply 2 years ago. http://hands.com/~lkcl/eoma/microdesktop - look for the 1.7 pcb pdf if you'd like to help. also apologies, being in china, the internet speed here is so f*****d i simply can't keep up with messages. i've seen the logo discussion, i'll be able to review it when i'm back in taiwan some time around the 1st april. if you are going to reply and would like to help with the DXF drawings PLEASE BE BRIEF and STAY ON-TOPIC under this subject-line. i know we generally don't do that here on arm-netbooks but in this case it's really important.... at least for the next 10 days. thanks everyone. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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back to taiwan, internet access not available for a while
by Luke Kenneth Casson Leighton 29 Mar '17

29 Mar '17

am moving to a new apartment, internet access has to be applied for. don't know how long that will take. will need to arrange borrowing internet access. l.

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