Software Fix

Software Fix

The software solution involves a number of behind-the-scenes changes to kernel functions that manage I/O mapping. However, for third-party device drivers, the fix to the IO4 problem consists of ensuring that any IO4 doing DMA input (when a device uses DMA to write to memory) flushes its cache on any interrupt. This change has been made in IRIX 6.2 to all device drivers supplied by Silicon Graphics.

A patch containing all necessary fixes is available for IRIX 5.3. Contact the Silicon Graphics technical support line for the current patch number for a particular system.