[Openocd-development] Error: JTAG scan chain interrogation failed: all zeros

[John A. <jal...@sp...>]

Hi All,

 

I picked up a thread thru google.com that mentions the "interrogation
failed" error, and am having that problem myself.

 

 
<http://www.mail-archive.com/ope...@li.../msg08501.h
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http://www.mail-archive.com/ope...@li.../msg08501.ht
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I'm using an Olimex ARM-USB-OCD dongle on an Olimex lpc2148 (the little
header board) running openocd v0.4.0 on ubuntu 8.04.  I was initially able
to flash the board with a small test program (1344 bytes) and debug with ddd
using 

 

openocd -f interface /olimex-arm-usb-ocd.cfg -f board/olimex_lpc_h2148.cfg

 

However, when I tried to flash the board with a larger program (126408
bytes), the flashing failed (I didn't save the errors), and for every
subsequent command issued I got

 

Command handler execution failed

In procedure 'reset' called at file "command.c", line 637

Called at file "command.c", line 352

 

Here's the flash script

halt

arm7_9 dcc_downloads enable

wait_halt

sleep 10

poll

mdw 0x0 100

flash probe 0

flash protect_check 0

# erase first bank only:

flash erase_sector 0 0 26

mdw 0x0 100

flash write_bank 0 lpc2148demo.bin 0x0

mdw 0x0 100

reset halt

sleep 10

#shutdown

 

This script has worked numerous times with the smaller program.   After
restarting the openocd daemon and power cycling the lpc2148 (and totally
rebooting everything) I always get

 

Sudo openocd -f interface/olimex-arm-usb-ocd.cfg -f
board/olimex_lpc_h2148.cfg

[sudo] password for jalfredo: 

Open On-Chip Debugger 0.4.0-rc1 (2010-02-05-16:27)

For bug reports, read

      http://openocd.berlios.de/doc/doxygen/bugs.html

RCLK - adaptive

jtag_nsrst_delay: 200

jtag_ntrst_delay: 200

trst_and_srst srst_pulls_trst srst_gates_jtag trst_push_pull srst_open_drain

Info : device: 4 "2232C"

Info : deviceID: 364511235

Info : SerialNumber: FTPYZRPV A

Info : Description: Olimex OpenOCD JTAG A

Info : RCLK (adaptive clock speed) not supported - fallback to 500 kHz

Error: JTAG scan chain interrogation failed: all zeroes

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

Error: JTAG scan chain interrogation failed: all zeroes

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

Command handler execution failed

Warn : jtag initialization failed; try 'jtag init' again.

 

If I call 'jtag init' in the telnet window it returns "jtag init has already
been called", however I'm still not able to issue any commands without the
above error.

 

Also, it does not appear that flash memory on the lpc2148 actually changed
because the previous code is still running-a blinking LED from a timer
interrupt and another LED responding to buttons via an ISR. However if I try
to issue "mdw 0x0 32"  to see what flash looks like I get the "Command
handler execution failed" error above.  Every command returns this error,
including poll.

 

Is it possible the JTAG registers on the lpc2148 or the ARM-USB_OCD got
jammed somehow?  I'm not convinced the lpc2148 is bad since the previous
program is running, however I'm not able to do anything via JTAG with
openocd.

 

How do I get this working again?  Is there a minimal command I can issue to
verify that openocd can in fact talk to the lpc2148?  Any help would be
sincerely appreciated.

 

Respectfully,

 

John Alfredo