Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!cbmvax!andy From: andy@cbmvax.UUCP (Andy Finkel) Newsgroups: comp.sys.amiga Subject: Re: 68020/68881 on A2000 Message-ID: <2864@cbmvax.UUCP> Date: Wed, 25-Nov-87 10:56:27 EST Article-I.D.: cbmvax.2864 Posted: Wed Nov 25 10:56:27 1987 Date-Received: Sun, 29-Nov-87 01:10:06 EST References: <1718@netsys.UUCP> <2858@cbmvax.UUCP> Reply-To: andy@cbmvax.UUCP (Andy Finkel) Organization: Commodore Technology, West Chester, PA Lines: 26 In article <2858@cbmvax.UUCP> daveh@cbmvax.UUCP (Dave Haynie) writes: >That, of course, assumes that you have this RAM where the OS can get at it. >How does CSA configure their 32 bit RAM? If it's not at the head of the >FAST memory list, you may be getting other memory first. If it's >autoconfigured, you definitely want to run SlowMemLast on a B2000. If not, >that may or may not put the 32 bit RAM up front, depending on their AddMem >command. Should be really noticable if it's wrong vs. right. Warning...I think the CSA memory is out of the normal autoconfig address range. This means that DMA devices (like our hard disk) can't see it. If you use such a combination, don't addmem the 32 bit memory until after the driver has been bound (ie after binddrivers) and accessed, so all the buffers are allocated where the disk controller can get to them. (this is one of the reasons that our 68020 board puts its 32 bit ram in autoconfig space) -- andy finkel {ihnp4|seismo|allegra}!cbmvax!andy Commodore-Amiga, Inc. "Any sufficiently advanced technology is indistinguishable from a rigged demo." Any expressed opinions are mine; but feel free to share. I disclaim all responsibilities, all shapes, all sizes, all colors.