JTAG flashing memory

[2PAC Mafia]

Hello,

I read 2 memories firmware by JTAG using URJtag but when I used flashmem instruction and it finished writing on them, when I compared the binary files, original and written on them, they were different. Aparently the code is the same but every some hex lines I saw an extra byte which finally makes the file different, let´s say the code is moving on byte to the right every some lines due to that new byte. Any idea about this?

 

[gophert]

Are you encrypting the code?

 

[2PAC Mafia]

No, we just copy back what we read.

 

[Boxnut]

Gotta be sure programming voltages are correct. Had similar problems myself. wound up programming the flash directly.

 

[2PAC Mafia]

Thank you for your answer, further investigation send to me to a problem on URJTAG under Windows, it seems there was a bug, somebody created a patch for those instructions with problems but I couldn´t check it yet. Supposely in Linux that problem doesn´t exist.