How to make sure a buffer is stored in cache on arm 9

Question

I have a character buffer which i want to place in Cache ,how to make sure that in memory map the compiler places this in DCache.

Compiler is RVCT 3.1

Answer 1

Hi,

I never heard of such feature in ARM. There is the PLD instruction that is a hint for preloading some data.

Answer 2

This is called "cache lockdown", and is supported by most (if not all) ARM9 processors, depending on the cache architecture. Here is a useful page from the ARM920T reference manual, including some example code. You should be able to find information for your specific processor in the table of contents on that page.