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cyphunk / JTAGenum

Given an Arduino compatible microcontroller or Raspberry PI (experimental), JTAGenum scans pins[] for basic JTAG functionality and can be used to enumerate the Instruction Register for undocumented instructions. Props to JTAG scanner and Arduinull which came before JTAGenum and forwhich much of the code and logic is based on. Feel free to branch and modify religiously (readme, credits, whatever)

Home Page:http://deadhacker.com/tools

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Segmentation fault on raspi model B

elijahlimas123 opened this issue · comments

commented

i have git cloned into https://github.com/cyphunk/JTAGenum.git. i cd into JTAGenum and run sudo bash JTAGenum.sh. this returns with Segmentation fault. prior to getting this error it was telling me that i was missing parentheses in the print statements in the .sh file, i fixed that and now running JTAGenum.sh gives me Segmentation fault.

i am on raspberry pi model B

commented

Could you run the bash script with -x so we can figure out which command is segfaulting.

bash -x ./JTAGenum.sh

commented

thanks for the response, i was able to resolve this problem. however, i am now encountering another. the issue is that loopback check, scan and scan_idcode are not returning any results. i have enabled verbose output and i still don't see the problem. any suggestions?

commented

my pinout is: 14 22 19 3 23, with pin 14 being ground.

commented

I'm sorry to say that beyond the information that is in the readme and in the wiki I'm not able to give much more advice. Whenever I use JTAGenum I will test it first against a target with JTAG pins I know for certain are active and responding. This confirms the toolkit is working as I expected. Then I move to testing on an unknown target.

Without a known jtag active device to test against I can recommend checking loopback works by shorting two of the pins. Result should be loop is found there. I can also say that the shell script version has not been as extensively tested. It works in some conditions and might not work in others.