Solved - Can't write to flash - "dma write not correctly"

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Solved - Can't write to flash - "dma write not correctly"

kmowery

Hi all,
I have a WRT54GLv1.1 and a TUMPA, and I'm having trouble writing anything to flash. Reads appear to work just fine.
I'm using the command:

zjtag.exe -flash:cfe /L1:4 /fc:032

and during the process, many errors occur, all something like:

dma write not correctly !!
70707000 - FFFF7000

Each time, a 32-bit section has been replaced by 0xFFFF. Reading the area afterward shows that 0xFFFF is indeed written all over the place.
I've tried adding /delay and changing the /L1 value, but I haven't been getting anywhere. I did try the /nodma flag, but that stalls after about twenty seconds and refuses to continue. I don't know why.
Any ideas? Is this indicative of damaged hardware?

[deleted]

Which version of the zjtag are you using? Could you please try latest version if you are using an older version? If you are using the latest version and having the problem, could you please try version 0.4 and let me know if the problem also existed in v0.4 or not.?

kmowery

I'm using zjtag 1.0, as downloaded yesterday from http://www.tiaowiki.com/download//file.php?id=37 . I can try the sourceforge version later today if you think it might help.
Edit: oh man, I can't read. Yes, I'll try 0.4 and report back.

kmowery

zjtag v0.4 reports success, but re-reading the data shows that 0xFFFF is being written all over the place.
zjtag v0.4 is hanging when I give it the /nodma flag.
Is there a chance the flash chip is damaged? I have a few other WRT54GLs I can test on.

kmowery

So, I got it working by adding many wires going from ground<->ground, which may have helped or maybe I just nudged a bad connection around. In any case, zjtag 0.4 and 1.0 can both write fairly consistently to the flash.
So, if you've come across this via Google, make sure you short the grounds together and check all your connections.
Thanks!

[deleted]

Thank you for the feedback.