From: Sergey Vlasov <vsu@altlinux.ru>
To: hardware@altlinux.ru
Subject: Re: [Hardware] udma-режим на одном шлейфе для двух иде-винчестеров
Date: Tue, 20 Apr 2004 21:12:55 +0400
Message-ID: <20040420171255.GD28707@master.mivlgu.local> (raw)
In-Reply-To: <20040420144800.GY27518@osdn.org.ua>
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On Tue, Apr 20, 2004 at 05:48:00PM +0300, Michael Shigorin wrote:
> On Tue, Apr 20, 2004 at 02:33:02PM +0600, Ruslan Gordeev wrote:
> > > И укстати, пока не перебросил на второй канал CD-RW, винт
> > > отказывался работать в udma5, как ему положено, а только в
> > > udma2. Так и должно быть?
> > Видимо, все правильно. Канал начинает работать на скорости
> > самого медленного из подключенных к нему устройств.
>
> Чушь собачья. Со стажем, но все равно чушь.
Это не совсем чушь - например, в pdc202xx_new.c и pdc202xx_old.c
есть такой комментарий:
/*
* Set the control register to use the 66Mhz system
* clock for UDMA 3/4 mode operation. If one drive on
* a channel is U66 capable but the other isn't we
* fall back to U33 mode. The BIOS INT 13 hooks turn
* the clock on then off for each read/write issued. I don't
* do that here because it would require modifying the
* kernel, separating the fop routines from the kernel or
* somehow hooking the fops calls. It may also be possible to
* leave the 66Mhz clock on and readjust the timing
* parameters.
*/
Т.е. на некоторых контроллерах такая ситуация вполне возможна.
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next prev parent reply other threads:[~2004-04-20 17:12 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-19 9:34 Ruslan Gordeev
2004-04-19 9:57 ` Sergey Vlasov
2004-04-19 10:24 ` Yuri N. Sedunov
2004-04-20 8:33 ` Ruslan Gordeev
2004-04-20 14:48 ` Michael Shigorin
2004-04-20 16:35 ` Sergey S. Skulachenko
2004-04-21 7:26 ` Sergey S. Skulachenko
2004-04-20 17:12 ` Sergey Vlasov [this message]
2004-04-21 3:00 ` Ruslan Gordeev
2004-04-21 5:45 ` Michael Shigorin
2004-04-21 7:38 ` Ruslan Gordeev
2004-04-21 13:45 ` Michael Shigorin
2004-04-21 15:04 ` Sergey S. Skulachenko
2004-04-22 2:40 ` Ruslan Gordeev
2004-04-22 8:03 ` Anton Farygin
2004-04-22 9:11 ` [Hardware] предложение: тематика (was: udma-режим на одном шлейфе для двух иде-винчестеров) Michael Shigorin
2004-04-22 9:42 ` Anton Farygin
2004-04-22 11:06 ` Michael Shigorin
2004-04-20 3:16 ` [Hardware] udma-режим на одном шлейфе для двух иде-винчестеров Ruslan Gordeev
2004-04-20 5:14 ` Sergey Vlasov
2004-04-20 9:23 ` Anton Farygin
2004-04-20 8:34 ` Ruslan Gordeev
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