Date: Wed, 12 Feb 1997 10:19:44 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: bde@zeta.org.au (Bruce Evans) Cc: julian@whistle.com, terry@lambert.org, freebsd-hackers@freebsd.org, Shimon@i-Connect.Net Subject: Re: Raw I/O Question Message-ID: <199702121719.KAA00730@phaeton.artisoft.com> In-Reply-To: <199702120822.TAA06992@godzilla.zeta.org.au> from "Bruce Evans" at Feb 12, 97 07:22:17 pm
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> >it then calls the strategy routine for the device > >which gets the kv region, > >and extracts the phyical addresses again and > >sets up the DMA > >and then waits > > > >DMA is directly into the users pages.. > > Only for devices and device drivers that support and use DMA. And are not limited to 24 bit ISA I/O when the physical memory target of the DMA is not above 16M. These will be bounced and then copied to the users pages. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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