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How to force ARM core into debug state when DBGEN was tied LOW?
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How to force ARM core into debug state when DBGEN was tied LOW?
Shih-Yen Kao
over 10 years ago
Note: This was originally posted on 11th January 2009 at
http://forums.arm.com
[size=3][font="Courier New"]
Hello,
After our SoC(ARM926EJ-S inside) was mounted on our development board, ARM Multi-ICE was able to connect to it and get its processor ID. But,
Multi-ICE could not force ARM core into debug state from Multi-ICE
, which means we cannot look at memory, registers, and peripheral status and download new images to execute.
We found some useful information from Multi-ICE user guide(DUI0048F), ARM926EJ-S (r0p4/r0p5) Technical Reference Manual (DDI0198D), and ARM926EJ (r0p4/r0p5) Integration Manual (DII 0089C). All of them indicated one bug of our hardcore connections, which is
the DBGEN should be tied to HIGH for enabling debug functionality
. However, our tied the DBGEN to LOW instead.
Is there any alternative way to re-enable debug functionality in order to force processor into debug state from Multi-ICE when DBGEN was tied to LOW?
Thank you in advance for your time.
Regards,
Cuthbert
The following information was we found from documents.
From "ARM926EJ-S (r0p4/r0p5) Technical Reference Manual (DDI0198D)":
------------------------------------------
DBGEN / Debug enable /
Input Enables the debug features of the processor. This signal must be tied LOW if debug is not required.
------------------------------------------
From "ARM926EJ (r0p4/r0p5) Integration Manual (DII 0089C)":
------------------------------------------
DBGEN / Input Debug enable signal
---- Caution ----
If this signal is tied off to logic 0 debugging is not possible.
If you require debug functionality, tie this signal to logic 1 (for example, using RealView ICE).
------------------------------------------
[/font][/size]
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Peter Harris
over 10 years ago
+1
verified
Note: This was originally posted on 11th January 2009 at http://forums.arm.com Hi Cuthbert Some SoC designs will provide a implementation-defined mechanism to control the DBGEN signal - this will vary...
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Peter Harris
over 10 years ago
Note: This was originally posted on 11th January 2009 at
http://forums.arm.com
Hi Cuthbert
Some SoC designs will provide a implementation-defined mechanism to control the DBGEN signal - this will vary from vendor to vendor and may not exist at all.
If there is no mechanism outside of the core to re-enable DBGEN then you are out of luck - the main reason to disable debug is SoC security - so there is no way to re-enable it as part of the ARM logic itself.
Cheers,
Iso
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Peter Harris
over 10 years ago
Note: This was originally posted on 11th January 2009 at
http://forums.arm.com
Hi Cuthbert
Some SoC designs will provide a implementation-defined mechanism to control the DBGEN signal - this will vary from vendor to vendor and may not exist at all.
If there is no mechanism outside of the core to re-enable DBGEN then you are out of luck - the main reason to disable debug is SoC security - so there is no way to re-enable it as part of the ARM logic itself.
Cheers,
Iso
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