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Altera_Forum's avatar
Altera_Forum
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15 years ago

NIOS with DDR as Main Memory

Hello everyone, I am attempting to use the DDR memory as the main memory for the NIOS core. As such, I decided to enable burst transfers for the processor. I have a couple of questions regardi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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Also, have you compiled everything (including the BSP and libc bits) with -O2 or -O3, without those there will be a lot of cycles to the stack (which will almost certainly also be in your DDR memory).

Even with a data cache the stack will probably be displaced from the cache by your sequential memory accesses.

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I have not tried to modify the compiler flags yet. Would it be better to connect the DDR as just another data master/slave to the CPU while using internal memory for the instructions?