Error: JTAG scan chain interrogation failed: all zeroes

[srinivasa]

Hi,
I'm trying enable Olimex OpenOCD JTAG ARM-USB-OCD-H interfaced to rpi5.Getting below "JTAG scan chain interrogation failed: all zeroes" after issuing below cmd: any clue.

sai@sai:/usr/local/share/openocd$ sudo openocd  -f interface/ftdi/olimex-arm-usb-ocd-h.cfg -f board/rpi4b.cfg

Open On-Chip Debugger 0.12.0-dirty (2024-09-22-16:43)
Licensed under GNU GPL v2
For bug reports, read
   http://openocd.org/doc/doxygen/bugs.html
Info : auto-selecting first available session transport "jtag". To override use 'transport select <transport>'.
Warn : Transport "jtag" was already selected
trst_only separate trst_push_pull

Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : clock speed 4000 kHz
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: bcm2711.cpu: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
Error: Invalid ACK (0) in DAP response

=================================================================
FTDI device detected in dmesgs as below:

[10326.785553] usb 1-2: new high-speed USB device number 4 using xhci_hcd
[10327.142688] usb 1-2: New USB device found, idVendor=15ba, idProduct=002b, bcdDevice= 7.00
[10327.142692] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[10327.142695] usb 1-2: Product: Olimex OpenOCD JTAG ARM-USB-OCD-H
[10327.142697] usb 1-2: SerialNumber: OL2794DF
[10327.159804] ftdi_sio 1-2:1.1: FTDI USB Serial Device converter detected
[10327.159838] usb 1-2: Detected FT2232H
[10327.162632] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB0

[LubOlimex]

This logs shows that the problem is somewhere between the JTAG and the target. This means the drivers and the ARM-USB-OCD-H appear to be properly working.

The issue is either in the hardware connections OR in the rpi4b.cfg