ARM-USB-OCD-H JTAG

[jtagkit]

Hi,

I'm trying to get JTAG working on a board which as cs3516 arm with spansion flash. It has a 20-pin JTAG port. This is what I get when I fire up openocd. I tried by reducing the adapter clock upto 0 but I still get these errors/warn. The target reset doesn't work. I think a proper JTAG connection should give JTAG TAP Info. Any idea what could be wrong here and how to fix?

Code Select Expand

openocd -f interface/olimex-arm-usb-ocd-h.cfg  -f target/cs351x.cfg
Open On-Chip Debugger 0.6.1 (2013-05-04-20:46)
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: 500 kHz
dcc downloads are enabled
Info : max TCK change to: 30000 kHz
Info : clock speed 500 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: cs351x.cpu: IR capture error; saw 0x0f not 0x01
Warn : Bypassing JTAG setup events due to errors
Info : Embedded ICE version 15
Error: unknown EmbeddedICE version (comms ctrl: 0xffffffff)
Info : cs351x.cpu: hardware has 2 breakpoint/watchpoint units
Error: fa526_change_to_arm: there is no Thumb state on FA526
Warn : ThumbEE -- incomplete suppor

Code Select Expand

(gdb) mon targets
    TargetName         Type       Endian TapName            State
--  ------------------ ---------- ------ ------------------ ------------
0* cs351x.cpu         fa526      little cs351x.cpu         halted

[maria_olimex]

Hello,

Maybe you can try with the new openocd-0.7.0 and then see if there is still an issue?
http://openocd.sourceforge.net/

Best Regards,
Maria/OLIMEX

[jtagkit]

Thanks Maria. I tried the OpenOCD 0.7.0 version and I got the same errors. I think the JTAG circuit is not open for some reason. Maybe proper timing, SRST signals, speed have to be setup to open the circuit.

[LubOlimex]

Hey jtagkit,

Can you, please, direct us to some datasheet of the board you use or the microcontroller you use?

Best regard,
Lub/OLIMEX

[jtagkit]

Hey Lub,

Thanks for pitching in. Unfortunately there are no datasheets of the board and the SoC available that I could find. The board is from Alpha Networks and the SoC is Cortina CS3516 which is based on the FA256 ( ARM920T/Armv4 variant ). I guess RST needs to be asserted with nTRST reset. I tried some combinations of these signals but nothing worked. I guess RST is open and unless it's asserted manually it's not gonna work.

[LubOlimex]

Hey jtagkit,

There are different reset strategies in OpenOCD. These can be edited in the .cfg files. Please check here: http://openocd.sourceforge.net/doc/html/Reset-Configuration.html.

Best regards,
Lub/OLIMEX

[jtagkit]

Thanks Lub. I've tried various reset config combinations but they didn't help.

I think I'll have to check the JTAG signals to see what's going on. I'll look for a good logic analyzer supporting JTAG protocol.

Thanks