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#rockbox log for 2020-09-14

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13:05:03 Quit t0mato (Quit: Ping timeout (120 seconds))
13:12:44_bilgusspeachy got the diskbench script up on gerrit and some striking results between the clipzip and xduoox3 in regards to sequential read/write, its about half the speed on the xduoo
13:12:52_bilgushttp://www.mediafire.com/folder/60g0cqojundk8/Rockbox_DiskBench
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13:25:02speachy...firing it up on my X3 with git head. so far I'm seeing about 20% better performance than you saw but that's easily due to the different card.
13:31:12speachyso I guess the real question is if it's the USB code, or the SD code. I'm personally thinking USB.
13:31:38speachy(since the disk_bench plugin shows much higher sequential speeds)
13:31:43_bilgusI feel like the comparison is key in this instance but runs off a baseline will come in handy as we mess witht the code
13:33:03_bilgusthe file size and blocksize is configurable but I figured the defaults as supplied should be good for a decent 'typical' workload
13:33:19_bilgus10mb and 64k respectively
13:36:29_bilgusoh and it does crc verification for the reads might be important for ipods :)
13:43:42speachyoh, this is interesting. USB doesn't have DMA enabled.
13:44:59speachyguess I shouldn't be surprised; it was disabled for everything else when I picked up this port.
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14:32:53_bilguswell well well thats a nice find you didn't even need a disk bench for that one
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14:41:04_bilgusyeah that wasn't hidden but it was a bit obscured in EP_INIT
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14:49:00speachy(and it's broken, naturally)
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14:51:45_bilgusthats better than already set up and no room for real improvement
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18:59:55speachylooks like the DMA is never competing, for reasons unknown.
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19:00:45speachyI'm getting an endpoint pktrdy interrupt but DMA is supposed to take care of all of that.
19:01:38_bilgusare you just at setting it to dma = true at this point or did you have to do more to get it to this point?
19:02:17speachyturning that on, all endpoints are using #defines, and a ton of debug code added..
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19:03:28speachyno errors either, the DMA engine is still sitting there with no indication that it even triggered.
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19:07:39_bilgusok so first suggestion is to use the hold switch as a way to bypass the dma portion
19:07:57_bilgusthat way you can still rolo rather than restart
19:09:28_bilguswell I guess nbd if you have a card reader
19:09:31speachyokay, progress. looks like tehre are hardware bugs.
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19:10:06_bilgushardware bugs like on chip or like they miswired?
19:10:25speachy"undocumented features"
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19:12:04speachyhave to to enable bits in a specfic sequence to get DMA operation to work. And.. best of all, even under normal operation we can't always use DMA. so it's going to have to be runtime switched based on the specifics of the operation
19:12:18speachy(....)
19:15:02_bilgusO_o
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19:16:14_bilguswhere in the hell did you find this?
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19:52:12speachygonna put all of this aside until at least after dinner. maybe until tomorrow.
19:52:22speachylinux kernel sources. :)
19:52:33speachyit's a mentor graphics USB core.
19:52:51speachyused in a lot of semi-broken SoCs...
19:54:01speachyi did part of the tweak, the handshaking went further (including ocmpleted dma transactions) but it went sideways a fee steps later. so I'm on the right track but I need to do this more ststematically.
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