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Cortex R8 axi unaligned transfer

I have an issue in my retarget printf study

AXI master port have not any transfer when I change address to unaligned address

There is my C code

volatitle int *tube = (volatile int *)0xfc000000;

*tube = ch;

I change the address to 0xfc000001;

I not sure this usage is legal or not in Cortex-r8.

Or my C program has not recommended style.

Thank for your help!

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