 Question : I was wondering how it coped with the problem that you can only bus-master to physical memory rather than logical memory (which is how you view it from Win32). Thus if you malloc some memory it may well be logically a contiguous area but consist of multiple disjoint physical pages. We are planning on using the C6x EVM for some development for our Ethernet switch products. I have been reviewing the reference guide documentation for the EVM and have a question about the bus-mastering operation of the board. Answer : This must be done at Ring 0
where you can get a contiguous memory buffer and allocate it at physical addresses. Ring 3
(Win32) applications do not have the privilege to do this. Therefore, |