About SDMA debug mode in i.MX6DL.

[keitanagashima]

Dear Sir or Madam,

Hello. I have a question about SDMA debug mode in i.MX6DL.

[Issue]

In case of data transfer via SDMA:

When the value of "Channel Control Block" and "Channel Context" becomes except zero, SDMA has entered in the debug mode.

When zaro clearing these memory areas, the problem didn't happen.

[Questions]

Why does the problem occur when Channel Control Block and Channel Context are except 0?

BSP: L3.14.28_1.0.0

Best Regards,

Keita

[Yuri]

Hello,

  According to section 55.4.5 (OnCE and PCU Debug States) of the i.MX6 S/DL RM :

"When a channel is running (that is, when CCR and CCPRI are different from 0,

which can be read in the PSW register), SDMA can execute a SoftBkpt instruction

from the channel script or receive a debug request. When either happens, the SDMA

enters its "Classical" Debug state, which is described in OnCE and Real-Time

Debug."

   This means, that in Your case SoftBkpt instruction is located in the channel script

(what script is used ?)  or a JTAG debug request has been received.

Have a great day,
Yuri

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[keitanagashima]

Hi Yuri,

Hello. Thank you for your reply.

>  This means, that in Your case SoftBkpt instruction is located in the channel script

> (what script is used ?)

My customer has used "mcu_2_shp" script.

(The same phenomenon happened by using mcu_2_app, too.)

[Questions]

[Q1] (My 1st question)

Why does the problem occur when Channel Control Block and Channel Context are except 0?

I didn't understand the relation of the problem and these register (Channel Control Block, Channel Context).

[Q2]

> This means, that in Your case SoftBkpt instruction is located in the channel script

> (what script is used ?)  or a JTAG debug request has been received.

Is it possible to use JTAG debugger for SDMA debug purpose?

Best Regards,

Keita

[Yuri]

Hello,

Please let me know the problem in more details, perphaps with source codes.

Regards,

Yuri.