Rockbox Development > New Ports
SanDisk Sansa c200v2, m200v4, clipv1, clipv2, clip+, and fuzev2
atomikpunk:
Here is a little update for tonight.
It seems that BlockA actually contains the usual ARM 9 vector table right off at the beginning of BlockA (0x400 offset from beginning of firmware file). In the M200 firmware, only the reset, irq and fiq seems to be handled though. All the (four) others are simply infinite loops, so if they ever happen, the device is frozen.
I'll be looking at the reset vector in the next couple of days. There seem to be some hard coded addresses in there so some input about the device memory map from those with the AS3525 datasheet would be really appreciated.
saratoga:
Bagder:
Theres another M200V2 (or rather V4) firmware here:
http://ca1.storage.flashcp.com/sansa2/Firmware/M200/4/A/PACKAGE/SansaM200_plusA4_0_45.txt
(rename to .7z)
Firmware format looks superficially similar to the other V2 players, but I didn't look at it in much detail.
Edit: Apparently the V2 M200 series have been out for quite a while. That firmware update was posted on ABI in January 2007.
Edit2: Has anyone tried the "special MSC mode" trick on the E200v2? The one where you plug in USB with the device off like described on Bagder's V2 page? Seems very odd to me that it wouldn't work on the other players.
atomikpunk:
Well I got my M250 on april 2007 so yes it's been quite a while now... _If_ there is a recovery mode or "special" msc mode, would you think it would appear in the firmware or it would be hardcoded in the hardware?
Owh and BTW, from what I saw in the m200 firmware, there doesn't seem to be checksums for "regular" blocks. I've only seen a checksum for Block A, the one at 0x400.
Bagder:
I added that m200 firmware to the v2 page and I've tried to incorporate the more recent file format data/info we've learned.
advcomp2019:
--- Quote from: saratoga on May 02, 2008, 09:58:43 PM ---Edit2: Has anyone tried the "special MSC mode" trick on the E200v2? The one where you plug in USB with the device off like described on Bagder's V2 page? Seems very odd to me that it wouldn't work on the other players.
--- End quote ---
About a month or two ago, I looked at this file( http://daniel.haxx.se/sansa/v2/c200/sansa-c200v2.zip ) which is on Bagder's v2 page. If you look at those folders and if you have a v2, the special mode is just an hidden MSC mode that was in the older firmware. Since they added USB modes to the menu, this trick looks like it does not work any more. I tried it with my Clip. With the Clip, it was the "Select" button and not |<<.
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