Date: Thu, 16 Dec 1999 13:58:19 -0800 (PST) From: Alfred Perlstein <bright@wintelcom.net> To: Ian Struble <ian@broken.net> Cc: Jonathon McKitrick <jcm@dogma.freebsd-uk.eu.org>, Alejandro Ramirez <ales@megared.net.mx>, freebsd-questions@FreeBSD.ORG Subject: RE: LBA speed enhancements Message-ID: <Pine.BSF.4.21.9912161355430.4557-100000@fw.wintelcom.net> In-Reply-To: <Pine.BSF.3.91.991216092310.23637K-100000@disavowed.broken.net>
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On Thu, 16 Dec 1999, Ian Struble wrote: > > > On Thu, 16 Dec 1999, Jonathon McKitrick wrote: > > > > > On Thu, 16 Dec 1999, Alejandro Ramirez wrote: > > > Are you refering to the "0xa0ffa0ff" flags???, this flags are for > > >improve performance by enabling DMA use, enable the multi-sector I/O and the > > >32BIT I/O modes to IDE Disks. > > > > Yes, and there is also a bit to set LBA mode. At least, that's what LINT > > says. > > The specific flag that Jonathon is talking about is the '1' below. Using > it we would have "0xb0ffb0ff" for flags. Which I can not say that I have > ever done nor remember seeing anyone else talk about using. Oh.... I've talked about it, maybe 'talked' is being nice. I strongly suggest staying away from turning on the LBA modes on drives until the maintainers of the drivers test and announce that it no longer eats disks when doing a crashdump when LBA is active. pfft. -Alfred > > from /usr/src/i386/isa/wd.c: > #define WDOPT_32BIT 0x8000 > #define WDOPT_SLEEPHACK 0x4000 > #define WDOPT_DMA 0x2000 > #define WDOPT_LBA 0x1000 > > Ian > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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