Date: Tue, 08 Jun 1999 00:53:54 -0600 From: Warner Losh <imp@harmony.village.org> To: Jos Backus <Jos.Backus@nl.origin-it.com> Cc: Wilko Bulte <wilko@yedi.iaf.nl>, zzhang@cs.binghamton.edu, freebsd-hackers@FreeBSD.ORG Subject: Re: The choice of MAXPHYS Message-ID: <199906080653.AAA03505@harmony.village.org> In-Reply-To: Your message of "Thu, 03 Jun 1999 23:12:16 %2B0200." <19990603231216.A36464@hal.mpn.cp.philips.com> References: <19990603231216.A36464@hal.mpn.cp.philips.com> <19990603172907.A20792@hal.mpn.cp.philips.com> <199906031730.TAA00686@yedi.iaf.nl>
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In message <19990603231216.A36464@hal.mpn.cp.philips.com> Jos Backus writes: : On Thu, Jun 03, 1999 at 07:30:20PM +0200, Wilko Bulte wrote: : > 20 bits. But older cards can do no more than 64 kB. : : Indeed, 20 bits (=1 Mbyte) for the address, 16 bits for the transfer counter : (offset). Isn't that 24 bits for addresses? You can dma from an ISA card to anywhere in the first 16M... Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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