Rockbox Development > New Ports
SanDisk Sansa m200 series (v1)
LambdaCalculus:
No, mine doesn't say anything above the revision.
Also, there's no extra chip on the daughterboard; only the Samsung chip is there.
So it looks like I have one that does indeed access the NAND directly.
rickbronson:
Oops, on a previous post I mentioned that there were no accesses of the SD/MMC addresses in the disassembled SANSM200.rom. Well, I had the wrong version of SANSM200.rom! Once I got the 3.2.8A version here:
http://mp3support.sandisk.com/sansa/Firmware/M200/3/A/SansaM200A3_2_8.txt
and disassembled it, it does indeed access the SD/MMC range (eg 0x90000104). Oddly enough it still accesses the NAND registers (like 0x90000050). So I think earlier statements about the extra chip on the daughter board being a SD/NAND bridge are probably correct. I wonder if this chip could be:
http://www.sandisk.com/Assets/File/OEM/Manuals/ProdManiNANDAbr1.1.pdf
Some of the above may explain why people have bricked their units by forcing to a wrong version of software as reported on anythingbutipod.
I did spend some time looking for a serial port by toggling the serial TX pins in the bootloader and then probing for a certain HZ signal on various pads on the board but no luck.
Rick
scorche:
I have been looking at the porting effort as well and recently purchased 3 m240s on woot as they were cheap enough and so I will have some to pass out at DCE if anyone wants them. I ended up with 1 v2 and 2 v1s.
I opened them up to see if I had one to trade with shotofadds as these devices are for others anyway, but sadly it seems that both of my v1s are HARP as well. :-\
shotofadds:
--- Quote from: scorche on June 07, 2008, 07:25:44 PM ---I opened them up to see if I had one to trade with shotofadds as these devices are for others anyway, but sadly it seems that both of my v1s are HARP as well. :-\
--- End quote ---
HARP isn't necessarily a bad thing (in fact, if it really is an SD interface as per E200/C200 it potentially makes an M200 port much easier). But it doesn't help me figure out the Telechips NAND driver. :(
scorche:
--- Quote from: shotofadds on June 08, 2008, 11:20:29 AM ---HARP isn't necessarily a bad thing...But it doesn't help me figure out the Telechips NAND driver. :(
--- End quote ---
Which is what I was going for there. ;)
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