I'm trying to connect a Bus Blaster v3c<http://dangerousprototypes.com/docs/Bus_Blaster_v3_design_overview>to a Beagle Bone Black. I'm seeing identical output to the AM335X problem posted here: https://forum.sparkfun.com/viewtopic.php?f=18&t=35490
I'm using OpenOCD 0.8. TDO is always 1, if I ground it, OpenOCD reports "JTAG scan chain interrogation failed: all zeros". TCK is constantly changing. I'm using the Tincan Tools ARM20 to cTI20 adapter<http://www.tincantools.com/JTAG/ARM20CTI20.html>. The Bus Blaster uses the same ARM20 pinout as the Tincan Flyswatter. I've verified via continuity that everything is correct wiring/adapter wise The Tincan instructions for using the adapter<http://www.tincantools.com/wiki/Flyswatter2_BeagleBone_Black_How_To>with their JTAG interface are pretty straight forward, I used their config as a starting point (FYI: I see the same output using the openocd supplied am335x.cfg) $ openocd -f ./ti_beaglebone_with_fs2.cfg -c init -c "reset init" Open On-Chip Debugger 0.8.0 (2014-05-12-14:07) 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: 100 kHz Warn : target name is deprecated use: 'cortex_a' trst_and_srst separate srst_gates_jtag trst_push_pull srst_open_drain connect_deassert_srst Info : clock speed 100 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 Tips/suggestions welcomed. I'm out of ideas. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
