Using JTAG to read/write the flash MMI3G - Page 4
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  1. #46
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    First of all you need to buy a Tiao Jtag tool, and you cannot read or write all in one time, you need to split the files.... (because mmi restart self every 5min.)

  2. #47
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    Ok, I already place the order for Tiao but I hope that segger can read too. I try on portions, I read first the IPL, next fpga and so on. It reads but it reads incorrectly. On the first page eprst use segger and he manage to read.

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    I was try also a year ago with segger but never done, when you get your Tiao all will be fine!

  4. The Following User Says Thank You to gsmflasch For This Useful Post:

    tehnosoftex (24th June, 2017)

  5. #49
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    Today i had some strange experience with one MMI 3GP unit.
    I was able to write both flash chips but, when Y17 (flash chip 2) i was able to write only on portions of 256k each.
    I used 5Mgh TCK, do not check write status (really slow write w/o this) and use unlock bypass mode.
    Used TIAO USB JTAG with TopJTAG Flash.
    This way i flashed the IPL in one pass, FPGA on three passes and emg ifs on 19 passes
    Anyone have idea what is not right. Flash chip 1 is ok, 2 MB pieces and the 5-6 min timeout is ok.

    Regards.

  6. #50
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    Today get my tiao usb but cannot see any device in jtag chain. With segger I identify correctly the renesas sh4 and can read. There is some settings that I must do to use tiao?

  7. #51
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    Ofcourse without boot settings or files its not possible to communicate...

  8. #52
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    I use topjtag flash programmer with the same settings like for segger but I chose tiao adapter from top jtag. I try all jumper settings on tiao, same result, no device find on jtag chain. On segger top jtag identifies at once the renesas mcu on jtag chain. I use r7785b bsdl file

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    I managed at last to communicate, Ive chose tiao interface type a instead of type b and it works

  10. #54
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    What about a24? To read both flashes need a0-a24 connected but according the connection from first page I connect only a0-a23, and can read only a half of firmware.

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    Sorry. Wrong post..
    Last edited by rendezo; 12th September, 2017 at 09:18 PM.

  12. #56
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    Hi mates, any news?

  13. #57
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    Quote Originally Posted by tehnosoftex View Post
    What about a24? To read both flashes need a0-a24 connected but according the connection from first page I connect only a0-a23, and can read only a half of firmware.
    There is a lot of small points, without the manual all operation nearly impossible....

  14. #58
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    anyone done similar things for bmw cic and have flash and v850 files? I have done some extracting from spdatens and need someone to confirm that Im doing something right .

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    Can someone help me how to proceed?aaa.jpg

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    did you succeed? I did something similar

 

 
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