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1077 discussions

HDMI HEC on future boards
by Vincent Legoll 12 Sep '16

12 Sep '16

Hello, I wanted to ask here, after trying to search ML archives & rhombus site. The EOMA68 standard has no provision for ethernet, but AFAIU the other end of the CPU card can be more or less free to use. So would it be possible to link a future SoC w/ ethernet to the HDMI HEC pins and get at least a 100Mbps ethernet, without needing any USB dongle. https://en.wikipedia.org/wiki/HDMI#Communication_channel_protocols Regards -- Vincent Legoll

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arrived in HK
by Luke Kenneth Casson Leighton 12 Sep '16

12 Sep '16

ouaaaaa, 13-hour flight, arrived 5am, 1hr bus to the hotel, arrived 7am, had a huge breakfast whilst waiting for the room to be ready... what's the first thing i do? reply to a long thread from paul across four separate mailing lists instead of showering and changing. ew. ... hilarious :) --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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#2- "MLC NAnd" corrupts-on-read how oft? Would your's have "ECCs", and use them to boot correctly?
by chadvellacott＠sasktel.net 12 Sep '16

12 Sep '16

The questions in THIS "e"mail, are regarding the "MLC NAnd" mentioned (as planned in the computer-cards via "Crowd Supply") in the "Q/A"-section on the campaign-page- https://www.crowdsupply.com/eoma68/micro-desktop (My earlier off-list question on this, and Luke's reply, are quoted at the bottom.) I have been reading on "MLC NAnd", and it seems that now I better understand the problem of corruption-on-read. (I have included links at the bottom, to some literature which I have looked at. This might give you a sense of my current state of understanding on this. And others of you might even find that some of the linked information is news to you.) But I have a few more questions. (a) How common is it for corruption-on-read to occur with "MLC NAnd" (like by something as basic as reads done by the built-in "ROM" "boot"-loader)? (Perhaps the answer is like "N % probability that one or more of the [1 to 4] bits in a cell, shall wrongly change it's logical value, after X reads of one or more pages in the same block, Y writes to one or more pages in the same block, and Z erases of the block".) At first I was thinking that the FIRST time data (mini "boot"-loader or otherwise) is read from the "NAnd", corruption might likely occur. But perhaps this corruption-on-read naturally happens ONLY after many reads or writes in a block and many erases of a block. So how common is it? (b) Would the "MLC NAnd" planned in the computer-cards via "Crowd Supply", have Error-Correction Codes? (c) If so, then does whatever reads the "NAnd" on "booting" (I guess it is called the "eGON boot-ROM"), know that it should (and know how to) use those "ECCs", to correct errors (if any) which it encounters when trying to start the "booting" process, so that it loads the correct original bits of the "boot"-loader ("minimalist" or otherwise)? I am looking forward to receiving answers to my questions, and soon sending my money to back many of the current offerings via "Crowd Supply". Sincerely, Chad. (:^) Links- a little info' on corruption, and on patented ]:^[ work to solve it- https://storagegaga.wordpress.com/category/data-corruption/ a little on how "NAnd-flash" works, and file-systems- http://www.linux-mtd.infradead.org/doc/nand.html more on how it works and how it can get corrupted- http://www.eetimes.com/document.asp?doc_id=1279762 followed by pages 2 to http://www.eetimes.com/document.asp?doc_id=1279762&page_number=4 some research on read-disturbs and mitigation- https://users.ece.cmu.edu/~saugatag/papers/15dsn.pdf detailed comparison of "MLC" and "SLC", with advice on how to use both- https://cdn.selinc.com/assets/Literature/Publications/White Papers/0015_NANDflash_IO_20141211.pdf?v=20151004-191546 (There should be a single space between "White" and "Papers".) booting "Allwinner" chips- http://linux-sunxi.org/BROM (Quotes below, might have minor changes, and might have additions enclosed by {}, and ~ for omissions.) On 16.8.26 12:11, lkcl . <lkcl(a)rhombus-tech.net> wrote: > On ~, {8th month}~, 2016 at 6:33 PM, Crowd Supply <orders(a)crowdsupply.com> wrote: >> chadvellacott(a)sasktel.net submitted a question about your project, >> "Earth-friendly EOMA68 Computing Devices": >> ~~~~~ > >> ~ it seems that your latest plan is or was, to use MLC-NAnd-flash for the >> internal "hard disk drive". And I noticed the mention that that can corrupt >> itself on read, not just on write. ~~~ > > primarily you should be looking to store a "mostly-read-only" OS on > the internal NAND, which then mounts external USB drives and Micro-SD > cards as well as mounts tmpfs's for the stuff you really don't need to > be persistent. i referenced somebody's script called > "readonlyrootfs.sh" which i've successfully used with CompactFlash > rootfs booting in the past. > > also you should really be looking to use jffs2 or better ubifs - some > work's going to be needed here - so that you don't end up losing data. > you can see online that people are talking about just dropping ext4 > directly onto raw NAND just because that's what allwinner does with > android... this is incredibly stupid and you clearly shouldn't be > doing it... but ignorance like this tends to get copied wholesale on > BBS forums... *sigh*. > > in the meantime you can always boot from external micro-sd card, > that's what i do all the time, i have a minimalist bootloader at the > front of the NAND and leave the rest of the NAND entirely alone. > > i *may* have to ship people with configs like that (a small 4gb or > 8gb microsd included)... just have to see how it goes. > > >> And I noticed the mention that you are considering using SLC instead. ~~~~~~ > > l. > >

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Re: [Arm-netbook] [Dev] [libreplanet-discuss] EOMA68 and freedom in digital technology
by IngeGNUe 10 Sep '16

10 Sep '16

On 09/10/2016 04:07 PM, Josh Branning wrote: > On 10/09/16 20:38, Luke Kenneth Casson Leighton wrote: > Unlike your boards, which give a 404 forbidden message when trying to > access the server. [2] Hopefully this is something you can correct. > _______________________________________________ > Dev mailing list > Dev(a)lists.parabola.nu > https://lists.parabola.nu/mailman/listinfo/dev 403 error is "forbidden", 404 is "not found" I poked around the eoma parent directory and noticed that the same error happened on some other files. I'm not a web person but as the error states: "You don't have permission to access /~lkcl/eoma/microdesktop on this server. Server unable to read htaccess file, denying access to be safe" it's probably something to do with the .htaccess file on his webserver. As he mentioned he's going to be offline for a couple days so just give him time.

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EOMA68 - linux and whatnot interview
by Luke Kenneth Casson Leighton 10 Sep '16

10 Sep '16

https://www.youtube.com/watch?v=7c_YTX06TL0 this was a lot of fun, to talk to these guys, and joshua as well. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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EOMA68 Microdesktop Revision 1.4
by Luke Kenneth Casson Leighton 10 Sep '16

10 Sep '16

https://youtu.be/E9root8aZFA must add this to the news page, just sending for now. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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microdesktop pcb
by Luke Kenneth Casson Leighton 09 Sep '16

09 Sep '16

eeek, i started on the microdesktop pcb again, prior to sending it off for prototyping cost-estimates and samples, and found that the USB ports were mirror-imaged! thank goodness i checked. we're off to HK in about 44 hours time, it's a looong flight. update about the past couple of weeks to be on crowdsupply shortly. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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Wikipedia's EOMA68 page
by Luke Kenneth Casson Leighton 09 Sep '16

09 Sep '16

... is going to quickly turn into a clusterf*** if people don't step in sharp-ish and help out. > [Wikipedia correctness and authoritative edits] > >> interesting situation - one that wikipedia's clearly never had to deal >> with before. > > Rather than spend a paragraph or two talking about that, I suggest that we > just build more robust external sources that the Wikipedia page can make use > of. Personally, I'm not a Wikipedia person, but I can possibly spend a little > more time looking at the page. (My previous edits were mostly about fixing up > citations, of which more are needed as the page stands.) yeahyeah, i noticed - appreciated. okay. well, i've had to revert *six* false and misleading statements on the page... so far. unfortunately the wikifascists [1] are beginning to step in - one of them unfortunately has Administrative rights. a "COI" notice was set up: this resulted in a rash of further misleading and factually incorrect statements being made. if people care about this, can you please step in? l. [1] definition (2) of http://www.urbandictionary.com/define.php?term=fascist

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Puzzle Phone? FOSS?
by Alexander .S.T. Ross 08 Sep '16

08 Sep '16

catching up with the news that project ara is dead i leant of puzzlephone: http://www.puzzlephone.com does anyone know weather they mean by them taking care of firmware? Do they mean 100% FLOSS or other?

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USB-to-Ethernet efficient throughput
by SohKa 07 Sep '16

07 Sep '16

Hello Does anyone have an idea of the efficient throughput with an Ethernet adapter connected to the micro-usb-otg port of the EOMA68 or to the USB2 ports of the micro desktop housing ? SohKa

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