Return to BSD News archive
Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!yeshua.marcam.com!usc!howland.reston.ans.net!EU.net!ieunet!news.ieunet.ie!jkh From: jkh@whisker.hubbard.ie (Jordan K. Hubbard) Newsgroups: comp.os.386bsd.development Subject: Re: DMA bounce-buffers now implemented in FreeBSD-current Followup-To: comp.os.386bsd.development Date: 27 Mar 1994 00:04:01 GMT Organization: Jordan Hubbard Lines: 22 Distribution: world Message-ID: <JKH.94Mar27000401@whisker.hubbard.ie> References: <JKH.94Mar25161128@sentnl.ilo.dec.com> <UWP.94Mar25194257@maelaren.cs.tu-berlin.de> NNTP-Posting-Host: whisker.hubbard.ie In-reply-to: uwp@cs.tu-berlin.de's message of 25 Mar 1994 18:42:57 GMT 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. What does this exactly mean ? Does this mean that I really can use upto 32MB or will the system just ignore them and that I'll get no more errors if I have more than 16MB installed ? No, they won't be ignored. You can have 32MB of fully-used memory in your system and the fact that ISA DMA is limited to 24 bits of address space simply won't be an issue anymore. Jordan -- Jordan K. Hubbard FreeBSD core team Electric Bivalves Anonymous On the net, no one can hear you scream.