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c5, Instruction Fault Status Register

Michail Bakunin
Note: This was originally posted on 5th January 2012 at http://forums.arm.com

I have implemented a MMU logic for the Cortex A8 on the BeagleBoard. It seems to work well. But after handling the first data abort and creating a page because no page is present right now, I am getting a prefetch abort with the State 1008 (hex) which means: bx01000 precise external abort, nontranslation (found at http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0344k/Bgbjhija.html).

But I have no clue what that means. Can someone please give me some more information about this error? If you need more information don't hesitate to ask me.

Thanks in advance,
Michail
Parents
  • Arm Employee Badge
    Note: This was originally posted on 6th January 2012 at http://forums.arm.com

    It means that the address translation processor "succeeded".  That is, the processor was able to read the translation table, and the entry marks the memory as read/executable.

    But that when it then accessed the physical address specified by the translation table entry, the memory system returned an error.
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  • Arm Employee Badge
    Note: This was originally posted on 6th January 2012 at http://forums.arm.com

    It means that the address translation processor "succeeded".  That is, the processor was able to read the translation table, and the entry marks the memory as read/executable.

    But that when it then accessed the physical address specified by the translation table entry, the memory system returned an error.
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