Rockbox Development > New Ports
SanDisk Sansa c200v2, m200v4, clipv1, clipv2, clip+, and fuzev2
Bagder:
The data sheet really doesn't mention a lot about it other than like this...
atomikpunk:
Hi Daniel,
please have a look a couple of post earlier, hth already did some investigation on JTAG. Maybe it will help you. From what I understand, the JTAG interface is in fact the ARM922T core JTAG interface. So, you can have a look at the (publicly available) ARM922T datasheet which is the arm core included in the AS3525.
I don't know much about JTAG but if you can connect to it and are able to read/write the rom/flash, as you said, it will be a lot easier and safer to work.
daniel_at:
Hello,
--- Quote from: atomikpunk on May 16, 2008, 04:50:17 PM ---please have a look a couple of post earlier, hth already did some investigation on JTAG.
--- End quote ---
Hm - have searched for JTAG prior, cant find a user hth here... i guess you mean my initial post - which ends with HTH, what means Hope That Helps :)
But anyway, thx to Bagder for looking that up in the datasheet. I have found in the ARM922 datasheet, that the nTRST should be pulled low while accessing the chip with JTAG - but i am not completely sure... maybe ill try to extend my JTAG-Programmer so that it trys all possible combinations of pinout-alignments and reset-state...
Daniel
saratoga:
--- Quote from: daniel_at on May 17, 2008, 11:34:28 AM ---Hello,
--- Quote from: atomikpunk on May 16, 2008, 04:50:17 PM ---please have a look a couple of post earlier, hth already did some investigation on JTAG.
--- End quote ---
Hm - have searched for JTAG prior, cant find a user hth here... i guess you mean my initial post - which ends with HTH, what means Hope That Helps :)
--- End quote ---
http://forums.rockbox.org/index.php?topic=14064.msg121222#msg121222
daniel_at:
@saratoga: oh..sorry, somehow i managed to search through the wrong post. Sad that there is no option to show a complete thread on one page - or is there one?... Oh, just found - "print preview". Nevermind :)
I have tried to connect the Sansa with the pinout from hth to my JTAG interface... couldn not initiate the connection. I have tried different states of the System- and the Test-Reset lines.
Will try some other configurations later.
Daniel
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