Date: Thu, 02 May 1996 22:10:02 -0700 From: "Amancio Hasty Jr." <hasty@rah.star-gate.com> To: A JOSEPH KOSHY <koshy@india.hp.com> Cc: hackers@FreeBSD.org Subject: Re: lmbench IDE anomaly Message-ID: <199605030510.WAA00415@rah.star-gate.com> In-Reply-To: Your message of "Fri, 03 May 1996 09:24:17 %2B0530." <199605030354.AA249295658@fakir.india.hp.com>
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> > >>>>> "ms" == "Michael Smith" >>>>> > > ms> But nobody uses it, AFAIK. There's support for the DMA controller in > ms> -current, all it requires is someone to wade into the 'wd' driver and > ms> add the required code to _use_ it. > > As a matter of curiosity, where can one get more information about > the bus-mastering IDE interfaces? Anything available on the Web/FTP? > > Koshy > The problem with IDE drives is that not all of them offer DMA bus mastering. Western digital or at least some of them have offerered dma access for quite some time now. So look around for the api on Western Digital drives chances are that thats the other IDE drives are using. Amancio
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