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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!spool.mu.edu!howland.reston.ans.net!xlink.net!news.dfn.de!rrz.uni-koeln.de!news-rhrz!sfb256!volker From: volker@sfb256.iam.uni-bonn.de ( Volker A. Brandt ) Subject: Re: > 16 MB of RAM (on an ISA box) Sender: usenet@work1.rhrz.uni-bonn.de (Usenet-Admin) Message-ID: <Jul06.111906.6442@work1.rhrz.uni-bonn.de> Date: 06 Jul 1993 13:11:26 MET References: <210g8n$3pr@pdq.coe.montana.edu> <1993Jul2.164901.22217@leland.stanford.edu> <2121b9$73v@pdq.coe.montana.edu> Organization: Applied Math, University of Bonn, Germany Lines: 34 In article <2121b9$73v@pdq.coe.montana.edu> nate@bsd.coe.montana.edu (Nate Williams) writes: >>It looks like the kernel (i386/isa/isa.c) checks that the DMA transfer >>will be into the lower 16 MB, and if it won't, the transfer is handled >>it in a special way (but I wasn't sure that this special handling is >>completely implemented; it seems that it is). So, this should not be >>a problem. > >As you noted above, this special handling is not completely implemented. >Rumor has it is has been finished in 0.2, but I don't have 0.2, and >haven't seen anything that looks remotely like 0.2. [...] >>Only if the driver/OS is stupid enough to try to get the ISA board to >>do a transfer above 16 MB. The earlier versions of SVR4 for the 386 >>failed to check that the transfer was in the ISA range. It looks like >>the Bill and Lynne are smarter than USL. > >Unfortunately, they didn't finish the job. So why can't we do it? Is anyone working on this? I have the sources and the BSD book but I have neither the knowledge nor the time to do it. I am, however, more than willing to help if I can, and I am also willing to do testing. Anyone out there who has thought about it? Alternatively, does anyone know more about the way 0.2 is supposed to fix this? Thanks -- Volker -- ---------------------------------------------------------------------------- Bitnet: UNM409@DBNRHRZ1 Volker A. Brandt Internet: volker@sfb256.iam.uni-bonn.de Angewandte Mathematik Phone: +49 228 73 3427 (Bonn, Germany)