Forum Discussion
Altera_Forum
Honored Contributor
15 years ago --- Quote Start --- If the address bit 31 is set, NIOS disables the cache for that access. This is necessary for I/O accesses. This only works for the non-MMU version of NIOS. OTHO AFAIK, there are arch independent macros defined in the Linux header files that can be used to define I/O addresses in a hardware-independent way. -Michael --- Quote End --- so it is decided by non-MMU version of NIOS II,when you set the address bit 31 to 1,there is no cache.Maybe I know it now! Thank you very much!