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Newsgroups: comp.os.386bsd.development Path: sserve!newshost.anu.edu.au!munnari.oz.au!ihnp4.ucsd.edu!usc!howland.reston.ans.net!pipex!sunic!EU.net!Germany.EU.net!netmbx.de!zrz.TU-Berlin.DE!fub!obh.in-berlin.de!aeon.in-berlin.de!thomas From: thomas@aeon.in-berlin.de (Thomas Wolfram) Subject: Re: DMA bounce-buffers now implemented in FreeBSD-current Message-ID: <Cnor2s.15w@aeon.in-berlin.de> Organization: Cities in Dust X-Newsreader: TIN [version 1.2 PL2] References: <JKH.94Mar25161128@sentnl.ilo.dec.com> <JKH.94Mar27000401@whisker.hubbard.ie> Date: Sun, 3 Apr 1994 13:35:15 GMT Lines: 23 Jordan K. Hubbard (jkh@whisker.hubbard.ie) wrote: > In article <UWP.94Mar25194257@maelaren.cs.tu-berlin.de> uwp@cs.tu-berlin.de (Udo Wolter) writes: > Can anyone describe what DMA bounce buffers exactly do besides of allowing > more than 16MB in an ISA machine ? > That's all they do. They also allow the usage of ISA controllers in > EISA machines, or VLB controllers with broken DMA (like the Buslogic > Bt445S) to work. Could someone please explain what "broken DMA" of Bt445S means exactly? Does it mean it acts like a ISA busmaster DMA controller (16MB address space only) or what? Is there a list of VLB controllers which have working DMA? Thank you in advance, Thomas -- Thomas Wolfram <thomas@aeon.in-berlin.de> Germany: 0 30 31421171 PRZ TU Berlin <wolf@prz.tu-berlin.de> abroad: +49 30 31421171 EANTC WWW: http://www.prz.tu-berlin.de:2784/~wolf _____________________________________________________________________________ _____S__I__C____T__R__A__N__S__I__T____G__L__O__R__I__A____M__U__N__D__I_____