Hi, > > Note that most MIPS documents use word 'load' and 'store' for instruction, > > and 'read' and 'write' for bus transaction. You have to distinguish them. > > Don't I? I understood that (singular) you distinguish them. I thought someone misunderstood in this thread. > > (Here I'm ignoring I/O access to make the point clear.) > > How do you define an I/O access for MIPS? uncached access. Off cource there can be exception. > > The data on a write bus transaction may be a data modified by a store > > instruction which was issued some years ago :-) What the OS can do? > > Report it and panic. I agree with you. > The problem with bus errors on MIPS is that one > can't distinguish between errors on reads and writes. But I did not understand that there is MIPS CPU which cause Bus Error Exception as a result of a bus error for a write bus transaction or a read bus transaction which caused by cache miss for a store instruction. It's messy... Hiroo
