arm-netbook September 2017

arm-netbook@lists.phcomp.co.uk

34 participants
22 discussions

Flash Debian and U-Boot to a PocketChip?
by Gpast_panama 22 Sep '17

22 Sep '17

Perhaps this is better suited to a reply than a new topic, but I'm not aware of how to do that with messages in digest mode so... Back in July, Pablo claimed at http://lists.phcomp.co.uk/pipermail/arm-netbook/2017-July/014340.html that he had successfully managed to get Debian Stretch running from USB on the PocketChip. Could somebody explain to a novice (i.e. me) what the steps entailed to flash u-boot and then boot Stretch are? A description of how to flash the OS to NAND would be amazing, but even just a brief outline of Pablo's process would be great. Thanks (and sorry for my ignorance)! Regards, Grace Past

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riki200 v3 first print: success
by Luke Kenneth Casson Leighton 21 Sep '17

21 Sep '17

http://forums.reprap.org/read.php?177,767087,787441#msg-787441 yay!

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libre board ?
by mdn 19 Sep '17

19 Sep '17

Hello, People shared this to me what do you think about it ? https://www.kickstarter.com/projects/librecomputer/libre-computer-board-nex… Has long has it's not RYF the "libre" wording creates some doubts in my mind. Have a nice day. -- Librement BERNARD ENG: Please be kind enough to use GPG for our future conversations: https://emailselfdefense.fsf.org/en/ If this email isn't PGP signed then it isn't mine. -If you can't compile it dump it.

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Feedback?
by Richard Wilbur 18 Sep '17

18 Sep '17

Luke, How are things going? Congratulations on a successful surface-mount board soldering trial of the JAE micro HDMI connector! I sent my latest recommendations regarding the high-frequency HDMI layout on 1 Sep. I was looking forward to some feedback with respect to some of the questions and suggestions I raised there. 1. Did you receive the message (it referred to 4 images you attached to a previous post)? 2. Does it need pictures showing what I'm talking about? 3. Please let me know if something doesn't make any sense so I can try to explain it better--so it does make sense. It is very possible that some of the things I recommended can't be done on this layout. That's okay. Let me know and I can see if there is another technique we can use to achieve the same goal or dismiss it as not necessary for a working system. Sincerely, Richard

2 4

Conflict-free minerals
by Jean Flamelle 18 Sep '17

18 Sep '17

I just thought I'd make a poke about this. Been a bit busy lately to contribute to the liberating chip or the standards thread, but will be getting back on those soon. No one has really mentioned conflict-free minerals, or does so often in the libre community. It's kinda like adding just one other complication to an already mess-y problem, but I'm interested to know more about the details and problems involved with paying attention to the actual mineral sourcing. I can imagine many OEM's don't publish or even pay attention to where they get minerals from, so I imagine the potential parts list dwindles beyond reason at simply limiting one's self to OEM's that at least list their mineral sources, much less then actually trying to them limit it based on the fairly subjective "conflict-free" qualification.

6 8

Retrfit a Nokia and KiCad fun
by mike.valk＠gmail.com 16 Sep '17

16 Sep '17

https://hackaday.com/2017/09/12/hackaday-prize-entry-retrofit-a-nokia/ https://hackaday.io/project/21263-nokia-3210-retro-fit-board Quote from the project log: "With the patched I submitted you can turn KiCad into a 'I know what I am doing' mode. Which meas you can place any type of via anywhere. You should not do it though. Vias are pretty well constraint by the manufacturer of the board. Since KiCad does not know of any layer thickness, production technologies and such it restricts to what is a sensible lowest common denominator." Hmm so KiCad does not have a "PCB manufacturer constraints" input? How handy... NOT

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ppcnotebook
by ronwirring＠Safe-mail.net 14 Sep '17

14 Sep '17

https://www.powerpc-notebook.org/en/ Do you know them? Are they credible? Thank you.

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pre-2.7.5 JAE DC3 micro-hdmi connector test PCB success
by Luke Kenneth Casson Leighton 13 Sep '17

13 Sep '17

http://rhombus-tech.net/allwinner_a10/news/ --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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Part sourcing
by mike.valk＠gmail.com 11 Sep '17

11 Sep '17

http://www.findchips.com/ We'll that's interesting. Doesn't beat the offline markets in Shenzhen I guess.

1 0

python coding help needed (sin, cosine, blah blah)
by Luke Kenneth Casson Leighton 10 Sep '17

10 Sep '17

http://hands.com/~lkcl/foldable3dsandwich200/belts.py ok, i could use some algorithm help, here, if anyone's interested. the key function is add_bearing in class Belt. basically what i have done is create a class which completely specifies a belt path, by starting out with the angle that the belt is wrapped around so far, plus the position, plus the diameter of the bearing (a fake bearing initially). subsequent bearings need only be added specifying their position, radius, and whether the belt is to go on the INTERIOR or the EXTERIOR of the bearing. the swapping-from-interior-to-exterior is where i'm having difficulties. i've made a half-assed approximation so far, i will upload a quick video about it... https://youtu.be/AV5yRz6GPX0 the problem i have is that the flip-over between interior and exterior is a little bit too complicated for my tiny brain to handle. i know that it involves twin offsets. i think it might be possible to work out the first angle between the bearings, then pretend that there's another bearing added on the *other* side (in the opposite configuration), then work out the angle of *that* (fake) bearing to the one before it... anyway if anybody would like to have a go at tackling this i would be really grateful. l.

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arm-netbook September 2017