Date: Wed, 11 Apr 2001 12:55:56 +1200 From: "Juha Saarinen" <juha@saarinen.org> To: "Brandon S. Allbery KF8NH" <allbery@ece.cmu.edu>, "Cyrille Lefevre" <clefevre@poboxes.com> Cc: <freebsd-stable@FreeBSD.ORG> Subject: RE: ATA_ENABLE_ATAPI_DMA gone? Message-ID: <KPECIILENDDLPCNIMLOFEEADCBAA.juha@saarinen.org> In-Reply-To: <250770000.986950121@rushlight.rem.cmu.edu>
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:: Certainly early CDROMs falsely claiming DMA support caused pain in the :: Linux community until they split off ATAPI DMA support into a separate :: config option. One can hope that modern hardware doesn't have that :: problem, but I have little faith in PC hardware :) Yes, seen that a lot on various platforms... think lot of it was caused by "non-standard" AT implementations that differed from vendor to vendor. Anyway, looked it up. ATA-1 specified these modes: PIO 0, 1 and 2 DMA 0, 1 and 2 plus multi-word DMA 0. ATA-2 added the Packet Interface stuff, so that you hang non-hd devices off the IDE interface, plus block-mode transfers, LBA, more DMA modes etc. PIO is in fact deprecated, if I read things right. Cheers, -- Juha To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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