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#rockbox log for 2009-01-18

00:00:00 Join BigBambi [0] (n=Alex@rockbox/staff/BigBambi)
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00:46:34ndunduI have a Sansa E250, and can't get the rockbox firmware, the gui and tthe ocmmand line tell me theres no sansa on the system = (
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00:57:14soapin MSC or MTP mode?
00:57:25soapand, is it an E250 v1 or v2?
00:57:47soapie. what Sansa firmware is on it, nd (oh - he is gone)
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01:05:37MonobroQuestion: I have a birkced c250 and I figured I need the e200 eraser tool to fix it. anyone know where to grab it?
01:06:11 Join suom1 [0] (i=markus@viitamaki.net)
01:07:49Monobroa sansa c250, naturally
01:08:13Monobroall forum posts on the topic are incomplete, either saying what you need with no links to it, or links to something without instructions
01:15:36 Join linuxstb [0] (n=linuxstb@rockbox/developer/linuxstb)
01:16:27krazykitMonobro, this is on the wiki
01:17:19krazykitMonobro, http://www.rockbox.org/twiki/bin/view/Main/SansaE200Unbrick
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01:21:17Monobrokrazykit, could you show me where? I searched the page
01:21:40krazykitread the Manufacturing Mode section closely
01:22:38krazykitbut try doing recovery mode first, which is an easier process, and see if that doesn't fix it
01:23:38Monobrodon't see the eraser tool or any info on that
01:23:44Monobroi'll keep looking around though, thanks
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01:29:07JdGordondoes memcpy() crash if the src pointer is NULL?
01:31:19linuxstbThat would depend on whether the device has memory at 0x0...
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01:49:02amiconnUnhelpful: Imo codecs should also be converted to use a loader-initialized api pointer, for consistency
01:49:30***Saving seen data "./dancer.seen"
01:49:42amiconnThey also use mem wrappers iirc
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03:14:46Unhelpfulamiconn: it's on my list, as is moving mem wrappers to the lib. did we ever determine if the cache wrappers serve a legitimate purpose, or if they're just a convenience? i don't see any reason the ones in mpegplayer can't be replaced with rb->func calls, and that will be smaller and faster than calling a function that just calls rb->func
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03:49:32***Saving seen data "./dancer.seen"
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04:44:36kugelsaa
04:44:40kugelR+
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04:44:52kugelsara
04:44:54kugelg
04:47:03tmztkugel: what version of svn should be used to build mkamsboot for a fuze to ensure that OF is bootable?
04:47:28kugeloops:/
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06:34:31JdGordonanyone around who uses an ipod and an accessory which relies on the track change event? (I'm not actually sure we support any like this though)
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08:52:29ProtQuestion: I'm getting 'permission for disc access denied!' from the rockbox utility with c250 sansa on vista/windows7. any times on how to get past it?
08:52:42Protapparently 1.07 doesn't have this bug, but the complete installation causes http 404
08:53:07Protany times? i guess I meant any tips
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09:54:42JdGordonpixelma_: hey, any chance you could test 9795 on hwcodec today/tonight please?
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11:31:23amiconnUnhelpful: Afaics the optimised scaling neglects proper rounding
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11:49:44***Saving seen data "./dancer.seen"
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12:36:43jhMikeSUnhelpful: Cache wrappers hides the fact that some CPUs cache functions are not inlines. Really, I was considering removing inlining for all of them. They aren't used much and are fairly slow. Also, align_buffer out of the core...not sure. It seemed appropriate for it to be there.
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15:05:29gartraldi the H10 5 and 20 gig DAPs have different sized screens?
15:05:57gartraldo*
15:06:17amiconnyes
15:10:26mrkikoAre some rockbox-supported players again in the market?
15:14:52Unhelpfulamiconn: you mean for pictureflow? i can change those divisions to round to nearest. if you mean that it no longer dithers, as the core scaler does, that's actually deliberate. because the renderer is using point sampling (any better would probably be terribly slow), dithered output suffers from aliasing.
15:15:58amiconnI mean the addition, which is now missing
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15:24:01*amiconn thinks that the old solution might even have been faster
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15:24:20amiconnThe new one uses 64*64bit multiplies...
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15:24:55amiconnUnhelpful: What are the limits for ctx->divisor and ctx->round?
15:33:05Unhelpfulamiconn: if i read the asm correctly, <32> * <64> >> 32 is output as a umull, discarding one of the output registers
15:33:14Unhelpfuldivisor and round are 32-bit
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15:34:08amiconnarm is not the only architecture this will run on
15:35:34amiconnAnd I know they are 32 bit - I was asking what range they actually use
15:40:13Unhelpfulamiconn: the scaler is already quite non-optimal on other architectures already, as that's the same math the scaler itself is using per-pixel.
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15:43:39*Unhelpful can't figure out what that compiles to on sh-1 at all
15:44:03*amiconn is more concerned about coldfire, actually
15:45:11Unhelpfulthe other version already needed a 64-bit multiply, and was doing a 64-bit divide as well. sh-1 and coldfire lack a 32*32->64 multiply?
15:46:43Unhelpfulactually, it looks good to me on coldfire... if mulu is what i think it is?
15:47:08amiconnThere is mulu.w and mulu.l
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15:47:46*amiconn would like to know the value range, which might offer further optimisation possibilities
15:48:23amiconnUnhelpful: Btw, there's now a settings bug in PF
15:48:35amiconnNo matter how often I disable "Show FPS", it is reenabled after a plugin restart
15:49:48***Saving seen data "./dancer.seen"
15:51:45Unhelpfulthe value is approximately (the last bit is zeroed, to avoid a 64-bit division) equal to (1<<32) / sf, where sf is the product of the input dimensions when scaling down, and the product of the output dimensions when scaling up
15:52:48Unhelpfuli'll have to look into the settings bug. i could kick myself over that, as i thought that i'd made sure TYPE_BOOL worked properly. :/
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15:55:26Unhelpfulthis seems to say it's 32*32->64? http://68k.hax.com/MULU
15:55:58amiconnNo, it's 32*32->32
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15:56:19amiconn(mulu.l that is. mulu.w is 16*16->32)
15:57:01Unhelpfulthe asm output looks like the second form for mulu.l given there
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15:57:52amiconnYes, the 3rd form doesn't exist for coldfire
15:57:58Unhelpfuli put just the multiply-shift in a function, it compiles to some moves and this: mulu.l 12(%a6),%d0:%d3
15:58:24Unhelpfulahhh... i must not be using the right arguments to gcc, i'll see which we actually use
15:58:35amiconnThis is a bad source of information; coldfire is a risc implementation of m68k and some addressing modes, forms, and even instructions don't exist on coldfire
15:59:27*amiconn recommends the coldfire programming reference manual
15:59:40amiconnIt's in our wiki iirc
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16:01:17Unhelpfuli'll have to check that later... it might be best, at least on some architectures, to go back to having a multiply in each scaler, if it's 16*16->32 instead of calling a 64-bit multiply function.
16:02:06Unhelpfuli'm pretty sure this means that pictureflow.c is already full of code that will work horribly on non-arm, by the way
16:02:46amiconnThat's why I was asking for the actual range used; I think it might be possible to avoid dealing with 64 bit ints, and avoid the division at the same time
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17:11:14Unhelpfulamiconn: if we shift values right by 8 places, it can use an unsigned 32x32->32... do we have *those* everywhere?