VME Mapping Support

VME Mapping Support

In systems that support the VME bus (Onyx, Challenge DM, Challenge L, Challenge XL, and their Power versions), IRIX contains a kernel-level device driver that supports mapping of VME bus addresses into the address space of a user process (see "Overview of Memory Mapping").

You can write a program that maps a portion of the VME bus address space into the program address space. Then you can load and store from device registers directly.

For more details of PIO to the VME bus, see Chapter 4, "User-Level Access to VME and EISA."