mph@behemoth.phx.mcd.mot.com (Mark Huth) (06/01/89)
As i reported yesterday, I'm having troubles with my 2620 crashing. Last night I tried setfastrom. With the fastrom installed (it copies rom to 32bit ram and write protects it, using the MMU to map it into the same address as the roms) I was able to complete all of the benchmarks. I ran overnight looping through the compilations that formed my benchmark, and found no problems. As soon as I removed the fastrom, every benchmark crashed. This would point to a problem with access to the ROM chips. Given that most of the failures seem to be related to instruction corruption (lockup, address trap, illegal instruction traps) I wonder if there isn't a timing problem going to offboard memory, and in particular, the roms. Any thoughts? Thanks, Mark Huth