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| 10:19.28 | jiltdil | HI is anyone has good link from where i can learn embeded linux |
| 10:20.21 | photon | points to the topic |
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| 10:26.55 | SpeedEvil | Start at one end of the linux source, and work your way to the other. |
| 10:27.04 | SpeedEvil | (caution, may cause insanity) |
| 10:29.35 | photon | or you may die of natural causes before you reach the end. |
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| 11:03.59 | SpeedEvil | The easy way is to do what linus does, and cheat. |
| 11:04.08 | SpeedEvil | Start 20 years ago, and read it as it comes in. |
| 11:04.51 | photon | Yes, it's really easy because you only have to time travel and your problem is fixed. |
| 11:08.47 | SpeedEvil | BRB - killing hitler. |
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| 17:26.33 | CosmicPenguin | prpplague: yo |
| 17:26.42 | prpplague | CosmicPenguin: yes? |
| 17:26.59 | CosmicPenguin | my daughter is hitting leapfrog / young child video game age - any recommendations? |
| 17:27.36 | xorrbit | Dead Island just came out |
| 17:27.44 | xorrbit | (-:|3 |
| 17:27.47 | prpplague | CosmicPenguin: there are few good ones out there right now, you may want to wait for a month and get the new leapad |
| 17:27.54 | CosmicPenguin | is that the explorer? |
| 17:28.02 | dalias | hi |
| 17:28.11 | dalias | i would recommend doom2 :) |
| 17:28.20 | dalias | it's a classic |
| 17:28.27 | CosmicPenguin | yeah, I'm preetty sure I didn't ask the peanut gallery |
| 17:28.33 | dalias | hehehe |
| 17:28.38 | xorrbit | hides |
| 17:28.40 | CosmicPenguin | prpplague happens to be an expert in the subject matter |
| 17:28.59 | CosmicPenguin | prpplague: http://www.toysrus.com/search/index.jsp?kwCatId=&kw=leappad%20explorer |
| 17:29.14 | prpplague | CosmicPenguin: http://www.elinux.org/LeapPad_Explorer |
| 17:29.25 | prpplague | CosmicPenguin: yea that is the one |
| 17:29.44 | prpplague | CosmicPenguin: i wasn't expecting to be available publically until first week of october |
| 17:29.46 | CosmicPenguin | nice - on it |
| 17:29.51 | prpplague | CosmicPenguin: guess i'm out of date |
| 17:30.25 | prpplague | CosmicPenguin: worst case, you can put angstrom on it |
| 17:31.10 | CosmicPenguin | heh |
| 17:31.12 | CosmicPenguin | buy two |
| 17:31.42 | CosmicPenguin | She actually needs something usable though - every time I sit down near the computer she is asking to play something |
| 17:32.34 | CosmicPenguin | I also need to pull out the ol' OLPC and put something new on that |
| 17:32.37 | CosmicPenguin | but I'm lazy |
| 17:33.08 | prpplague | CosmicPenguin: yea, leapfrog is pretty good about having good titles and a wide range of age topics |
| 17:33.30 | CosmicPenguin | yep, I consider it a trusted brand |
| 17:34.05 | prpplague | CosmicPenguin: vtech has some interesting designs, but they just aren't as robust |
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| 18:46.50 | prpplague | ho ho hum |
| 18:47.07 | prpplague | GPSFan: i still haven't figured out that write speed issue on my sd/mmc interface |
| 19:02.28 | GPSFan | prpplague, I've been wondering whether you had made any progress, I looked at the TRM wrt the mmc controller, and there are differences between mmc1 & mmc2 and mmc3-5 |
| 19:02.44 | prpplague | yea |
| 19:02.53 | prpplague | GPSFan: most of it is just voltage level controls |
| 19:02.59 | prpplague | GPSFan: i'm on mmc2 |
| 19:04.17 | GPSFan | prpplague, page 5183 and 5184 of rev W trm. |
| 19:04.44 | prpplague | GPSFan: one sec, let me pull that up |
| 19:05.59 | GPSFan | prpplague, looks like there is a pinmux or something on mmc2 that's not on mmc1 |
| 19:06.39 | prpplague | GPSFan: what are you seeing on page 5183? |
| 19:06.58 | prpplague | GPSFan: yea, there are two modes available for the sdmmc2 |
| 19:07.34 | GPSFan | prpplague, so maybe the driver is not selection the right mode on mmc2, |
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| 19:08.01 | GPSFan | mmc1 is the one that "works better(tm)" ? |
| 19:08.13 | prpplague | GPSFan: that was my thought, but the way i have the level shifters, you can't operate in the other mode at all |
| 19:08.17 | prpplague | GPSFan: yea |
| 19:08.37 | prpplague | GPSFan: and we know it isn;t an issue on the omap4430, as the blaze device used the sd/mmc2 with some eMMC |
| 19:09.06 | prpplague | GPSFan: i suspect there is a driver issue of some type |
| 19:09.14 | GPSFan | prpplague, I was just hazarding a WAG ... |
| 19:09.15 | prpplague | GPSFan: read performance is excellent |
| 19:09.19 | prpplague | GPSFan: understood |
| 19:09.39 | prpplague | GPSFan: i should be able to get back on debugging tomorrow though |
| 19:09.42 | GPSFan | not having a blaze or a board to bring the mmc2 out.... |
| 19:10.05 | prpplague | GPSFan: sd/mmc2 is on the expansion header of the panda |
| 19:10.29 | GPSFan | prpplague, I know, but I don't have anything connected to it. |
| 19:10.48 | prpplague | GPSFan: http://www.elinux.org/Panda_Bamboo#Design |
| 19:10.52 | prpplague | GPSFan: there is the schematic |
| 19:11.06 | prpplague | GPSFan: i'll get you a unit on the next rev of the board |
| 19:11.30 | GPSFan | prpplague, k, thanks.. |
| 19:12.28 | prpplague | GPSFan: i would think that if the read is working well, that if the write is slow, it is driver issue |
| 19:13.10 | GPSFan | prpplague, did you ever look at the mmc_cmd line with a scope during the "bad performing" writes? |
| 19:13.28 | prpplague | GPSFan: not yet, i was getting setup for that |
| 19:13.34 | prpplague | GPSFan: probably do it tomorrow |
| 19:13.41 | prpplague | GPSFan: add some addition debugging statements too |
| 19:15.18 | GPSFan | prpplague, that's the first thing I'd do, to see if the bit timing is slow or if there are big gaps between blocks/words/etc. as well as to make sure the mmc_clk is the right speed, or hosed up. |
| 19:16.19 | prpplague | GPSFan: yea, i want to make sure that it is actually operating at 24mhz |
| 19:16.34 | GPSFan | zactly.. |
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| 19:24.06 | GPSFan | prpplague, have you heard anything about kernel.org? seems like linuxfoundation.org is back, although nothing new since 9/7/2011. just a few days ago (maybe even yesterday) they were not working (just a status page detailing the problem) |
| 19:24.37 | prpplague | GPSFan: no update, other than linux foundation made me change my password |
| 19:25.59 | GPSFan | and it's a good thing too... "ilikebeer" isn't really all that great ;>)) |
| 19:27.16 | GPSFan | bbiab... |
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| 19:28.26 | prpplague | GPSFan: hehe |
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| 19:30.11 | dalias | :) |
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| 22:23.47 | dalias | anyone up for testing arm port of musl? |
| 22:29.08 | prpplague | musl? |
| 22:29.33 | roxfan | yet another c library |
| 22:29.34 | dalias | http://www.etalabs.net/musl/ |
| 22:29.39 | prpplague | ahh |
| 22:30.22 | dalias | roxfan, but apparently the first that actually cares about correctness and low bloat.. |
| 22:32.55 | roxfan | there must be some law, like "you can make your libc correct, small, fast, or feature-full - but not all at the same time" :) |
| 22:33.08 | dalias | :) |
| 22:34.03 | dalias | one of them (dietlibc) is only one-for-four... |
| 22:34.59 | roxfan | which one? |
| 22:35.21 | dalias | small |
| 22:35.25 | roxfan | ah |
| 22:35.51 | dalias | i had a benchmark to compare and had to disable the regex test for diet |
| 22:36.02 | dalias | because it was going to take 500 years or so to finish :-p |
| 22:36.44 | dalias | actually these days it is moderately feature-full too tho |
| 22:36.48 | dalias | so maybe it's 2-for-4 |
| 22:38.20 | dalias | its funny, from the beginning embedded targets have been one of my goals but i only recently got around to doing any porting |
| 22:38.23 | roxfan | is it still not configurable? |
| 22:38.42 | dalias | configurable feature set you mean? |
| 22:38.57 | roxfan | yes |
| 22:39.03 | dalias | for static linking, it doesn't matter because only the stuff that's actually used gets linked |
| 22:39.42 | dalias | achieved mostly thru factoring modules well, and a little bit of weak alias magic |
| 22:40.21 | dalias | for dynamic linking it could be useful to exclude some features, but the only one i can think of that would really help is iconv |
| 22:40.31 | roxfan | hmm i kinda see your point, but some extra configurability can be very useful |
| 22:40.32 | dalias | everything else is pretty tiny |
| 22:40.44 | roxfan | iconv is one, FP support is another |
| 22:40.57 | dalias | even pthread totals just around 10k |
| 22:41.26 | dalias | when FP is soft, yes, it could be a big win.. |
| 22:41.44 | roxfan | see e.g. http://support.code-red-tech.com/CodeRedWiki/UsingPrintf |
| 22:41.45 | dalias | otherwise the only expensive floating point code (in size) is in printf, and it's still only a few kb |
| 22:41.56 | roxfan | "only" hehe |
| 22:43.01 | dalias | well when busybox is 350k+ (and over 1mb full-featured on arm) |
| 22:43.22 | dalias | a few kb in libc.so is not a very measurable difference |
| 22:43.24 | roxfan | http://knowledgebase.nxp.com/showpost.php?p=8471&postcount=6 |
| 22:43.27 | roxfan | :) |
| 22:43.57 | dalias | musl's printf is ~7.9k on arm |
| 22:44.41 | dalias | and omitting floating point would reduce that by at most 3k i think |
| 22:45.02 | dalias | of course you also have to consider the libgcc soft-fp code |
| 22:45.13 | dalias | which could make the difference more substantial |
| 22:50.15 | dalias | i don't see more than ~2-3k of soft float code linked |
| 22:50.24 | dalias | integer division code is actually larger |
| 22:51.49 | roxfan | on cortex-m3 it matters more because it has hw division but no FP |
| 22:52.49 | dalias | i'm sure one could shave off some size making various features optional |
| 22:53.09 | dalias | what i'm not convinced of is that it's worth the maintenance cost (making sure all combinations work and don't break/bitrot) |
| 22:53.39 | dalias | as it is, a program that doesn't need the features is much smaller linked to musl than it is linked to uClibc |
| 22:54.29 | ohsix | you could split them up into a bunch of pieces and use linker magic to make it a bit closer to static linking :> |
| 22:55.17 | dalias | the problem is linker magic doesn't help you for code that might or might not be needed depending on format strings |
| 22:55.32 | dalias | i've used all the linker magic i can come up with :) |
| 22:56.47 | dalias | and it comes out really nice especially with thread stuff |
| 22:57.09 | roxfan | how are you testing it btw? |
| 23:00.15 | dalias | i have 3 test packages i use - open posix test suite (posixtest.sf.net), a basic sanity-test testsuite i made, and a rather incomplete but moderately useful stress-test suite developed for the project as part of GSoC |
| 23:01.17 | roxfan | tried glibc testsuite? |
| 23:01.19 | dalias | and we're looking to integrate more test from gnu stuff -- glibc and gnulib have a number of tests, but sometimes it's hard to tell when they're testing for correctness versus gnu behavior :) |
| 23:01.59 | dalias | last time i checked it was nontrivial to get it to build against non-glibc |
| 23:02.09 | dalias | but i do want to use it |
| 23:02.10 | roxfan | i see |
| 23:02.32 | dalias | these days musl supports a lot more of the gnu/bsd extensions present in glibc |
| 23:02.37 | dalias | so it might not be as hard to get it working |
| 23:03.10 | roxfan | http://sourcery.mentor.com/archives/arm-gnu/msg01031.html <- might give you some more sources |
| 23:07.25 | dalias | thanks |
| 23:52.51 | calculus | for some reason when I see musl I think of muesli |
| 23:55.24 | roxfan | you're not alone |
| 23:55.54 | dalias | :) |