I think we have a problem with the PREF instructions spread out in the memcpy function. We are prefetching outside the area we are copying. That's usually not a problem, but if we are prefetching outside the physical memory area (with an unmapped kseg address), anything could happen. We could get a bus error (which we potentially could handle), but even worse we could have mapped the PCI space immediately following the the RAM area and then anything could happen. So I think, we either need to make sure not to prefetch outside a page boundary or we make sure the last page in physical memory doesn't get use for unmapped kernel addresses. Any comments ? /Carsten -- _ _ ____ ___ Carsten Langgaard Mailto:carstenl@mips.com |\ /|||___)(___ MIPS Denmark Direct: +45 4486 5527 | \/ ||| ____) Lautrupvang 4B Switch: +45 4486 5555 TECHNOLOGIES 2750 Ballerup Fax...: +45 4486 5556 Denmark http://www.mips.com
