Rockbox Development > New Ports
SanDisk Sansa c200v2, m200v4, clipv1, clipv2, clip+, and fuzev2
7o9:
The patch is now commited as r23870.
FlynDice:
I have committed the patch above that moves the boost from SD identification freq to SD operating freq to after the switch to HS timings happens. I'm not sure why this all worked fine at 62 MHz and now at the lower freq problems arise. This seems to get the cards through the init process for now though so it's a first step.
When the cards get switched to HS timings we can actually see that from the info on the view disk info debug page. If the switch to HS timings is successful the speed will show 50 MBits/s. If we get this we can run the card at 31 MHz and be within the spec. If not we are running slightly over spec, the limit being 25 MHz for a standard speed card. My problem here is that we run PCLK at 62 MHz and we can only divide this by 1 or even integers (1,2,4,6...) so our next lower frequency is 15.5 MHz. Using 15.5 I get data crc failures presently during writes on both internal and uSD cards and I'm not quite sure why.
Right now I'm looking at the data crc failures. I think this is the preferred solution. If unable to overcome that then I think lowering PCLK to ~50 MHz solves our overclocking problem but may have other negatives associated with it.
Anyway, please yell loudly if you are still experiencing problems & thanks to those testing & helping out!
EDIT: Divider is even ints not power of 2...
epithetless:
Sadly, I'm still experiencing some system freezes during startup with my microSDHC card inserted, when inserting it with Rockbox already on, and when playing music from the card. :(
As before, the "View disk info" screen under the debug menu lists the card's speed as 25.0Mbit/s. (To refresh, it's an 8GB Class 2 SanDisk microSDHC card.)
Thanks for your work on this, FlynDice!
BlastTyrant:
--- Quote from: FlynDice on December 06, 2009, 02:54:51 AM ---I have committed the patch above...
--- End quote ---
I just put r23879 on my Fuze. The freezing issue is completely resolved for me now. I've booted it about 30 times since putting the new build on and it didn't freeze once.
MicroSD card is still running at 25MBits/s.
epithetless:
Well, I haven't had any issues since my last post, so perhaps they were just a fleeting residual effect of resuming playback immediately after updating to the newer build. Thanks again, FlynDice.
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