non-cacheable memory configuration

[sachinpandhare]

hi,
i understand that ioremap_nocache is platform dependent and can configure a memory to be non-cacheable. i am working on arm platform.
what is the 'bufferable' attribute of this memory? will it be bufferable or non-bufferable?
Can this API be used for any memory (kernel/user)?
Are there any limitations on size of the memory for this API?

Thanks,
Sachin