Reading/Writing ADSP Blackfin flash problems

[Fabian]

Hi everyone,
maybe someone already read it:
https://www.eevblog.com/forum/repair/rigol-dg4000-power-rails-failure-and-firmware-bricked/
I am trying to repair my DG4162 function generator. One problem is the broken firmware of the Blackfin DSP. I was able to get an FT2232H together with the ADI linux toolchain to talk to the DSP. I also figured out how to read/write the flash using urjtag and did it like written in the thread. But writing failed with some verify error. Now out of the sudden I am not even able to read the flash information using detectflash in urjtag. It gives me this error message:

Code: [Select]

jtag> detectflash 0x20000000
dev ID=ff96   man ID=0090
urj_flash_amd_detect: mid 90, did ffbf
error: flash: mid != 0x01Can someone tell me whats going on and how I properly read/write the flash?

[Fabian]

OK, I managed to get rid of the error message. There seems to be an additional hardware fault, causing the reset line of the flash chip to be "not exactly high". Added an additional pull-up an now I can write the flash, verify is also ok.
But I would still like to know what the correct procedure is to read/write the full flash? I had a deeper look into the 16M file I read from the device. It is actually 16 times the same data of 1M. So I am not reading the full flash. Is that not possible? Why is the flash file of the dg4000 than that big? What else is in there and where does it goes? Any insight in the data/instrument would help.

[tv84]

Any insight in the data/instrument would help.

Maybe I can help. Can you send me your flash dump?

Does the flash dump contain the bootloader at the beginning? If so, can you start up the unit?

Edit:

Is this your flash dump?
https://www.eevblog.com/forum/repair/rigol-dg4000-power-rails-failure-and-firmware-bricked/msg2677233/#msg2677233

[Fabian]

Yes, thats mine. Sorry for the late reply. Have not played with that problem for a long time and did not turn on notification.

[jackthomson43]

Btw there's no need to reply now .... after 4 months, he must have forgot that thread by now. seems like its about Embedded Systems.