Date: Sat, 26 Jun 1999 00:13:42 +0200 (CEST) From: jaco@titine.fr.eu.org (Eric Jacoboni) To: freebsd-questions@FreeBSD.ORG Subject: IDE DMA and 'multi-block' Message-ID: <19990625221342.815A615669@titine.fr.eu.org>
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From: Eric Jacoboni <jaco@titine.fr.eu.org> Date: 26 Jun 1999 00:13:42 +0200 In-Reply-To: Greg Lehey's message of "Fri, 18 Jun 1999 08:34:45 +0930" Message-ID: <87yah8vsh5.fsf_-_@titine.fr.eu.org> Lines: 33 Hi, I've noticed something i don't explain about my 2 IDE disks : # uname -r 3.2-STABLE # dmesg | grep wdc0 wdc0 at 0x1f0-0x1f7 irq 14 flags 0xa0ffa0ff on isa wdc0: unit 0 (wd0): <QUANTUM FIREBALL1280A>, DMA, 32-bit, multi-block-8 wdc0: unit 1 (wd1): <QUANTUM FIREBALL_TM2550A>, DMA, 32-bit, multi-block-16 Ok, both disks are in DMA 32 bit mode, but why the first one is said 'multi-block-8' and the second 'multi-block-16' ? As i've understood the docs, the flags '0xa0ffa0ff' mean : - 0xa0ff for wd0 : probe 32 bit transfers + probe PCI IDE DMA + max transfer size - 0xa0ff for wd1 : same thing... Both drives are Quantum FireBall IDE disks, the first one is a 1.2 Go, while the second one is a 2.5 Go : is it this size difference that explains the 'multi-block' difference ? BTW : what is the real meaning of this 'multi-block' value and what are its implications ? Thanks in advance, -- --------------------------------------------------------- Éric Jacoboni « No sport, cigars! » (W. Churchill) --------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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