Re: [Openocd-development] About AGDI interface of RealView MDK and SWJ support

2009-10-07 Thread David Brownell 
On Tuesday 06 October 2009, Øyvind Harboe wrote:
  So, SWJ gets nowhere in OpenOCD until SWD is working.
  And we've seen no SWD patches at all.
 
 Actually we did, but it is a long time ago and they were
 very disruptive.

Maybe this:

 
https://lists.berlios.de/pipermail/openocd-development/2008-November/003742.html

Advertised as a quick hack.  Necessarily all the code which
thinks it's talking JTAG would be horribly disappointed.  :)



 We get SWD/SWJ questions every so often, but I'm not very
 excited...

Advantage of SWD == fewer pins
Disadvantage == slower, AFAICT (with dumb hw like ft2232)

SWJ would be a lot more interesting if we had basic ETM
instruction trace working, to build on.  :)

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Re: [Openocd-development] About AGDI interface of RealView MDK and SWJ support

2009-10-07 Thread simon qian 
I'll later try to add SWJ support to my JTAG dongle(Versaloon), and try to
add
execute_swj_queue to the driver. I'll mail to the list if I need any help or
have
any progress.
After that, I can help with the SWD support.

As a generic JTAG debugging tool, OpenOCD do will some day support SWD.

-- 
Best Regards, SimonQian
http://www.SimonQian.com
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Re: [Openocd-development] About AGDI interface of RealView MDK and SWJ support

2009-10-06 Thread Duane Ellis 
simon qian wrote:
 Does is possible to get protocol of AGDI interface of RealView MDK?
 Then OpenOCD will be supported by it.

As for AGDI -

I have little interest in supporting Keil uVision - the closed IDE from 
Keil.

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka11379.html

I believe others share my view

I don't know about the SWJ status.

-Duane.

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Re: [Openocd-development] About AGDI interface of RealView MDK and SWJ support

2009-10-06 Thread David Brownell 
On Tuesday 06 October 2009, Duane Ellis wrote:
 I don't know about the SWJ status.

As I understand it, SWJ is the one-wire trace output scheme used
by certain trimmed-down Cortex-M3 parts.  It contrasts with the
more typical clock-plus-N-Wire alternative (N in {1, 2, 4}).

And it's built using a variant of the SWD two-wire messaging
scheme (contrasting with JTAG's 4-wire one).

So, SWJ gets nowhere in OpenOCD until SWD is working.
And we've seen no SWD patches at all.


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Re: [Openocd-development] About AGDI interface of RealView MDK and SWJ support

2009-10-06 Thread Øyvind Harboe 
 So, SWJ gets nowhere in OpenOCD until SWD is working.
 And we've seen no SWD patches at all.

Actually we did, but it is a long time ago and they were
very disruptive.

We get SWD/SWJ questions every so often, but I'm not very
excited...


-- 
Øyvind Harboe
http://www.zylin.com/zy1000.html
ARM7 ARM9 ARM11 XScale Cortex
JTAG debugger and flash programmer
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