Debug through the JTAG.

cancel
Showing results for 
Search instead for 
Did you mean: 

Debug through the JTAG.

Jump to solution
1,441 Views
fmajeric
Contributor III


Hello everybody,

I'm reading the i.MX 6Solo/6DualLite Applications Processor Reference Manual ( IMX6SDLRM, Rev. 1). What's a wonderful datasheet but little bit hard to catch all subtleties.

I'm interesting about the Debug abilities through the JTAG.

In Chapter 7 : System Debug, an overview is provided.

SJC.jpg

It is explained that through the JTAG protocol it is possible to stimulate the ARM DAP or the SDMA.

It seems the both can access and interact to specific modules:

  • The DAP enables debug access to the chip modules through APB-AP (the APB access port) and APB-Mux (the APB multiplexer).
  • The SDMA includes a OnCE controller which enables run/halt/single-step the core, access to the register/memory, etc...

So it seems, they has the same capacities and the section "55.4.13.2.3 Conflicts Between the JTAG and the ARM platform Accesses" confirm that.

>>So my questions are what is the difference between the DAP and the SDMA debug capacities ?

>>When should we use one or the other one ?

Thank you for any information.

Best Regards,

Fabien.

1 Solution
706 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Fabien

DAP provides commonly used jtag debug capabilities as, for example described on

ARM DS-5 Quick Start (i.MX6) - BlueWiki

Configuring jtag chains is described in Chapter 7 Configuring

JTAG Tools i.MX6 System Development User’s Guide

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

SDMA debug capacities though described in document, are not supported by nxp,

no tools are provided.

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

View solution in original post

4 Replies
707 Views
igorpadykov
NXP TechSupport
NXP TechSupport

Hi Fabien

DAP provides commonly used jtag debug capabilities as, for example described on

ARM DS-5 Quick Start (i.MX6) - BlueWiki

Configuring jtag chains is described in Chapter 7 Configuring

JTAG Tools i.MX6 System Development User’s Guide

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

SDMA debug capacities though described in document, are not supported by nxp,

no tools are provided.

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

706 Views
fmajeric
Contributor III

Hi Igorpadykov,

Thank you for your response.

If I've well understood, It's only the DAP which manage the debug abilities of all externals tools that are connected through the JTAG pins. The OnCE capacities of the SDMA are never used from tools connected through the JTAG pins ?

As I'm concerned, I use a non-ARM debug tool. I mean, I use a JTAG debug tool not sell by ARM but compatible with the ARM IPs. When I want to halt and read a CPU register, I connect my JTAG debug tool to the JTAG pins.

Are the signals proceed in the chain like that ?

Untitled.png

Please can you precise me the protocol followed by the signals when I want to read a CPU registers or fuses ?

Which controllers are concerned ? (Is my figure correct ?)

Thank you for your support,

Fabien.

0 Kudos
706 Views
igorpadykov
NXP TechSupport
NXP TechSupport

connections are given in i.MX6DQ Reference Manual p.4956

http://cache.nxp.com/files/soft_dev_tools/doc/support_info/iMX6DQPRM.pdf

1.jpg

protocol is JTAG IEEE1149.1 as described on that picture. For additional questions suggest to create new

thread.

~igor

706 Views
fmajeric
Contributor III

Ok thank you.

You are right, I will create a new thread.

Fabien.

0 Kudos