Date: Wed, 11 Apr 2001 02:45:16 +0200 (CEST) From: Cyrille Lefevre <root@gits.dyndns.org> To: Matthew Emmerton <matt@gsicomp.on.ca> Cc: freebsd-stable@FreeBSD.ORG, freebsd-doc@FreeBSD.ORG Subject: Re: ATA_ENABLE_ATAPI_DMA gone? Message-ID: <200104110045.f3B0jHA45737@gits.dyndns.org> In-Reply-To: <003301c0c21d$2c4b0cd0$1200a8c0@gsicomp.on.ca> "from Matthew Emmerton at Apr 10, 2001 08:20:10 pm"
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Matthew Emmerton wrote: > > the ata(4) manual page isn't clear about the difference between > > hw.ata.ata_dma (where ata-disk.c says ATA disk DMA mode control) and > > hw.ata.atapi_dma (where atapi-all.c says ATAPI device DMA mode control) ? > > ATA devices are hard disks. > ATAPI devices are everything else (tape drives, floppy drives - including > ZIP drives, and CD-ROM and DVD drives). I was just saying that the documentation isn't clear about that and I suppose that everybody don't have to look into the code to make the difference between them. do you understand what I mean. currently, the manual page entry says : hw.ata.ata_dma set to 1 for DMA access 0 for PIO (default is DMA). hw.ata.atapi_dma set to 1 for DMA access 0 for PIO (default is PIO). as you can see, neither the denomination nor the description say that hw.ata.ata_dma is about disks and hw.ata.atapi_dma for all other things. also, why ata_dma and just wc or tags ? to be homogeneous, the laters would have be named ata_wc and ata_tags. about tags, is there a software way to know if some drive is DPTA or DTLA compliant ? what's happen if someone enable this w/ uncompliant drives ? CC: -doc Cyrille. -- home: mailto:clefevre@poboxes.com UNIX is user-friendly; it's just particular work: mailto:Cyrille.Lefevre@edf.fr about who it chooses to be friends with. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-doc" in the body of the message
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