Error: JTAG scan chain interrogation failed: all ones

Development Boards MicroMod
1

I’m trying to connect my flyswatter via OpenOCD to a new custom TI AM335X based board. I’m getting these error messages below. How can I get this working?

sudo /usr/local/bin/openocd -f interface/flyswatter.cfg -f /usr/share/openocd/scripts/target/ti_AM335X.cfg -c init -c “reset init”

[sudo] password for smachin:

Open On-Chip Debugger 0.6.1 (2013-04-19-13:46)

Licensed under GNU GPL v2

For bug reports, read

http://openocd.sourceforge.net/doc/doxygen/bugs.html

Info : only one transport option; autoselect ‘jtag’

adapter speed: 16000 kHz

trst_and_srst separate srst_gates_jtag trst_push_pull srst_open_drain

Info : clock speed 6000 kHz

Error: JTAG scan chain interrogation failed: all ones

Error: Check JTAG interface, timings, target power, etc.

Error: Trying to use configured scan chain anyway…

Error: am335x.jrc: IR capture error; saw 0x3f not 0x01

Warn : Bypassing JTAG setup events due to errors

Error: JTAG scan chain interrogation failed: all ones

Error: Check JTAG interface, timings, target power, etc.

Error: Trying to use configured scan chain anyway…

Error: am335x.jrc: IR capture error; saw 0x3f not 0x01

Warn : Bypassing JTAG setup events due to errors

2

Hello Smachin,

i would try the following things:

  1. Reduce adapter_khz to e. g. 100 for testing → “adapter_khz 100”

  2. Get lastest version of openocd from git at sourceforge and compile it → git://openocd.git.sourceforge.net

Cheers

MaTT