For IMX6DQCE : Errata :ERR003731:An imprecise external abort, received while the processor enters WFI, may cause a processor deadlock

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For IMX6DQCE : Errata :ERR003731:An imprecise external abort, received while the processor enters WFI, may cause a processor deadlock

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manyam
Contributor I

Hi, the work around provided is too high level, could any one please provide more information and also if any fix is provided it will be a great helpful for me.

Work Around is mentioned as protecting the MMU with correct settings - what does it mean, and in ARM Architecture reference manual, it has been mentioned that in order to avoid dead lock, DSB operation is needed before entering the WFI. What does DSB Operation means??

Thanks in advance.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Subramanyam

below links may answer questions:

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0344k/Babhejba.html

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0344k/Babhejba.html

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0360f/I31997.html

Unfortunately for details it is necessary to apply to ARM (www.arm.com), actually this info

is provided by ARM.

Best regards

chip

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manyam
Contributor I

Hi,

i contacted ARM and they suggested to contact freescale. Is this issue applicable to only IM6 Platforms, or it is generic for all Cortex A9 based processors.

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igorpadykov
NXP TechSupport
NXP TechSupport

It is generic arm cortex-a9 core errata (this core is ARM IP).

Info was received from ARM.

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manyam
Contributor I

Hi,

So to protect the MMU, the configuration( Proper MMU Settings ), should be done during the Kernel Init only?

Regards,

Manyam

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Manyam

yes.

Optionally Uboot also can configure MMU,

in such case  - in Uboot too.

Best regards

chip

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