Arm Development Studio forum What happens if ITCM and DTCM overlap on ARM926EJ-S?

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What happens if ITCM and DTCM overlap on ARM926EJ-S?

Note: This was originally posted on 23rd January 2012 at http://forums.arm.com

Hello,

I noticed a bug in ITCM and DTCM initialization in some bootloader code.

The result is that the same value is written in the ITCM region register and in the DTCM region register, so both are configured with the same address and size.

It looks like in this case, ITCM gets priority over DTCM since everything is working correctly when executing code stored in this region of memory. If DTCM had priority, fetching an instruction from this region of memory would cause a prefetch abort exception.

Now, that's my understanding of what happens, but I couldn't find anything about it in the ARM926EJ-S documentation.

Can anybody confirm my theory, or explain what happens in detail?

Thanks,

Frédéric.