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Altera_Forum's avatar
Altera_Forum
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15 years ago

ow to define an uncached linker region

Can anyone tell me how to define a region in the linker to be uncached? An example - I have a block ram I am using for SGDMA descriptor tables that I need to define as uncached... Thanks - Chris
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

dsl -

Not certain I understand this - will NIOS be able to set up a table in this ram? isn't 2^31 above 0x8000 0000? I need the processor to parse queue fill levels and build a descriptor chain accordingly upon receipt of an aggregated interrupt... I am having all kinds of @$$-ache trying to get the pointers to function correctly and am surmizing (since sometimes the table is build half-correctly) that I am seeing a cache coherency issue...

Is there a way to disable data caching during operations to memory?