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Battery powered ram



I would like to connect a small battery powered SRAM chip to the etrax100LX, 
and use that for non volatile storage.
Now I'm wondering how I should reserve its physical address range at bootup, 
in order to be able to map it as a device (like /dev/mem).
Could this be done in a kernel driver, or is that already too late (memory 
might already be in use?)

Best regards,

Pieter