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Is your problem that it won't allow you to have one slave at address xxx0 and another at xxx4 ?
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Indeed.
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FWIW memcpy() isn't defined (or required) to use 32bit accesses, nor to copy the data is any particular order. So you are better coding any transfer loop directly in C. Given the Nios instruction set having different 'strides' for the source and destination will have to effect on the code size.
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You are entirely correct wrt POSIX memcpy(). I have gotten too much used to the default (linear) copy implementation :).
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Your slave must also look at the byte enable for the low 8 bits, you shouldn't assume it is set.
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I do require that the register is always accessed as a 32-bit DWORD (alt_u32). Doesn't that guarantee correctness ?
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I'd also consider using a single Avalon slave and muxing your 32 devices below it. It might save logic (since the optimiser might effect that anyway).
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That's a good idea, but it somewhat defeats the purpose of the automatic fabric generation by SOPC Builder / Qsys, does it not ? Still, thanks for the useful comments and suggestions.
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