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Maximum RAM Size

Altera_Forum
Honored Contributor II
780 Views

The Linux getting started guide mentions that the maximum amount of ram is 128MB. Why? 

 

Since there is 512MB of physical address space, why isn't the maximum amount of RAM at least 512MB (ignoring necessary peripherals).  

 

Is there a reason we can't use the full 4GB of physical address space? (Does Nios Linux support this?)
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