Rockbox Development > New Ports
Cowon D2
ThibG:
--- Quote from: shotofadds on July 11, 2008, 07:34:14 AM ---Thanks. I'll take a look later and maybe see if there's a way to optimize that add/sub stuff. Out of interest, what fps do you get in test_fps (both at 48MHz and 192MHz)?
--- End quote ---
48Mhz:
1/1: 19.2 fps
1/4: 75.5 fps
192Mhz:
1/1: 75.0 fps
1/4: 291.0 fps
andiator:
About the NAND, did anyone looked at TCC78xx_MultiMedia_Application_SDK_v044_release.zip linked in the post #96 on this thread?
Under project/FS there are a dma.c and tnftl.h (Telechips Nand Flash Translation Layer) found.
shotofadds:
Even if it contained anything useful, there's no way we could use code from the SDK. Anything going into Rockbox must either be written from scratch or come from another GPL-compatible source.
In any case, it appears that the TNFTL stuff is supplied as a pre-compiled binary library, which wouldn't be any use anyway.
El3ctroded:
--- Quote ---There's no way to get data back from the D2 to the PC... When you're dealing with 4Gb+ of data, it's quite a painful experience. :-\
--- End quote ---
That would be painful. But why is there no way to get data from the D2 to the PC? There's still the USB connection...
--- Quote ---Another idea that I've been meaning to try is this: from the PC, write every sector on the UMS volume with a unique identifier based on its LBA address. Then, using the current Rockbox driver, read every sector to find which ones are read incorrectly. If we then search the NAND for the correct identifier, it might give us some clues about how the scheme really works.
--- End quote ---
Sounds like a good plan.
El3ctroded
Dicky Dave:
A few days ago, I spent some time going over the code in the SDK to see if there were any clues in there. However, the most useful routines were supplied pre-compiled. objdump -D did a fairly good job of disassembling it but its pretty tough trying to work through it. My goal was to clarify the unknown fields that shotofadds identified so as to be understand the fs structure.
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