Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!tut!ra!rosenber From: rosenber@ra.abo.fi (Robin Rosenberg INF) Newsgroups: comp.sys.amiga.hardware Subject: 68030 & CT Message-ID: Date: 3 May 90 15:23:03 GMT Sender: rosenber@ra.abo.fi Distribution: comp Organization: Abo Akademi University, Finland Lines: 25 We have a problem here. One Amiga is equipped with CT's harddisk and evrything worked fine until the GVP A3001 68030 card was installed. The harddisk controller is an OMTI 5520 PC controller in the PC-bus on the Amiga connected to the Amiga bus with a bridge that does address decoding. So the controller is address at 0x800640 (or close). With the 030 card the harddisk device hangs. This was tracked down to that something was done too fast. The problem is mostly solved by slowing things down in the device driver but it may still hang occasionally. If I'm not mistaken the 68030 does a memory access in two cycles, vs the 68000's four cycles and the two cycle access is too fast for the controller. Could someone with more hardware knowledge shed some light on this? If it is the speed with which the controller is accessed that causes the problems, is there a simple way to introduce wait states for access to the controller? Any help? ------------ Robin Rosenberg