#linux-sunxi on 2014-06-09 — irc logs at freenode.irclog.whitequark.org

2014-05-01 13:53 mnemoc changed the topic of #linux-sunxi to: Allwinner/sunxi development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi

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04:06 <Turl> Montjoie: hi

04:06 <Turl> Montjoie: do you still have issues with prng? I was just reading some old emails

04:07 <plaes> oo.. kernel 3.15 is out

04:10 <Turl> Montjoie: as for DMA, ping me tomorrow, I will try to get you a branch you can play with

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04:19 <wens> Turl: ooh, DMA!

04:21 <Turl> wens: do you need it as well? :p

04:22 <wens> I want to try it out!

04:22 <wens> how did you do normal DMA btw?

04:22 <Turl> wens: I got the UARTs and SPI working via DMA

04:23 <wens> the docs are sketchy... "one transfer at a time, ordered by priority" but doesn't mention what priority is

04:23 <Turl> wens: yeah it doesn't

04:23 <Turl> the DMA engine doesn't have any notion of priority either as far as I can see

04:24 <Turl> (the API)

04:24 <wens> my guess would be, you can enable all 8 channels, then the hardware handles them one at a time

04:24 <wens> with dedicated dma, 8 channels run simultaneously

04:25 <wens> but that's just my uneducated guess :p

04:25 <Turl> that's how I implemented it

04:25 <Turl> but I'm not exactly stress testing it so dunno how well it works

04:25 <wens> and then use 3 cell dma bindings in DT to differentiate between normal and dedicated

04:26 <Turl> <&dma T C> where T = 1 for dedicated, 0 for normal

04:26 <Turl> and C is the endpoint

04:26 <wens> yeah that's what I had in mind

04:28 <Turl> wens: so far the performance has been pretty sucky; dmatest gives me like 4M/s tops

04:28 <Turl> doing mem2mem

04:28 <wens> cpu usage during the test?

04:29 <Turl> any method to measure that reliably?

04:29 <wens> don't know, maybe mripard has some ideas

04:29 <Turl> I'm using a serial terminal, so running the test and hurrying to run htop to have a look before it's over isn't practical

04:30 <wens> hmm, write a small shell script to launch top/whatever at the same time and redirect the output?

04:31 <wens> or just 'time' the dmatest and look at the system/user time to begin with

04:31 <Turl> dmatest is a kernel module though

04:31 <Turl> I can't 'time' it :p

04:32 <wens> oh right :/

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04:34 <wens> try kprobes, perf or something?

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04:52 <Turl> wens: can you read these things? :p http://imgh.us/lala.svgz

04:53 <Turl> dma0chan15-copy is the dmatest thing as far as I'm aware

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05:14 <Turl> good night :)

05:19 <wens> Turl: not really

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06:09 <montjoie1home]> Turl: for prng its work but not used, I need to create an additionnal HWRNG driver for using it

06:10 <montjoie1home]> I will send the v2 today

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09:30 <ankurguptaislost> hello

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09:59 <montjoie1home]> Does someone has tested sunxi-ss on other SoC than A20 ?

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10:02 <plaes> montjoie1home]: maybe ask that in mailing list

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15:03 <wens> someone doing wiki cleanup?

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15:53 <popolon> wens, I updated some things today

15:53 <popolon> added categories and some doc on livesuit, some images for cubieboard

15:55 <popolon> and some links from words to dedicated articles (or articles containing at least some info about)

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18:14 <nove> wrappers to wrappers to wrappers, why? is unknown

18:15 <nove> and the joy of guessing how to use the api

18:16 <nove> i don't know what would be, if i didn't have the tracer and already know the hardware, to see what the blobs are doing

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18:19 <nove> but we had really luck, the blobs are self-contained

18:22 <nove> anyway, jpeg and h264 encoding is working (old api)

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18:52 <nove> http://armdevices.net/2014/06/08/allwinner-a80-with-ipad-air-display-thinner-lighter-retina-9-7-tablets/

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19:10 <nove> as i don't have the time to *also* do kernel hacking, i will not get an A23/A33

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20:08 <Turl> montjoie1home]: not your driver, but I have successfully used the SS on A10 for MD5 and PRNG

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23:39 <CaptHindsight> any suggestions for a distro/ISO for the cubie2 or Banana Pi that has the source for tool chain so that you can build your own kernels?

23:40 <CaptHindsight> or an image that has enough space for native building or just a root file system tarball

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