Hello David,
I am not so sure about this. Still smells like reset problem to me.
It should be noted that when I let small bootloader execute from the
SPI flash and do the reset (and some other config), I can attach with
OpenOCD, i.e. chain is well scanned. I was able after attachment to
set-up SDRAM and launch eCos application (which would further
configure SoC). Now I erased the flash and tried without bootloader. I
do not exactly know what bootloader is doing (have not insight in the
code yet), but obviously nothing expect reset is needed for a proper
chain scanning.
It should be also noted that Lauterbach jtag attaches without any
problems. I do not think that it does anything special for this step.
All what is needed after is few lines of SDRAM set-up and application
can be uploaded and run. But that comes after attachment (as for
OpenOCD).
All this confirms that hardware is working properly. I am almost
convinced that bug is either on OpenOCD side (I tried with both ftd
libs) or I should configure reset in some special way...
Would anybody have some hints after these additional explanations ?
Best regards,
Drasko
It is not coming from your JTAGkey-2 since you can scan and detect the
chain after configuration of your system.
It is really somewhere in the OpenOCD .
But you could try to disable the use of RTCK feature from the Amontec
JTAGkey-2 and run at a super low frequency before doing your scan chain
detection.
Also, could you please try to disconnect the JTAGkey from USB port
before doing this. OpenOCD is still not really clean regarding the
finish using the Amontec JTAGey as other FT2232 USB JTAG dongle before
closing its handle in mpsse mode.
The sequence before closing the JTAGkey as other FT2232 USB JTAG dongle
should be :
- 1. place all pin as input
- 2. quit the mppse bitbang mode
- 3. close the handle
CLEAN AFTER COMING :-)
the 1. and 2. are NOT DONE in the actual OpenOCD and it can make trouble
when you close and re-open the openocd.
Let us know the debug output in this case.
Regards,
Laurent
http://www.amontec.com
Amontec USB JTAG cable suite : JTAGkey JTAGkey-2 JTAGkey-3 ( coming
soon with SWD support )
_______________________________________________
Openocd-development mailing list
Openocd-development@lists.berlios.de
https://lists.berlios.de/mailman/listinfo/openocd-development
