From owner-freebsd-stable  Thu Jan 24 11:53:34 2002
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From: "Lawrence Sica" <lomifeh@hotmail.com>
To: "Dmitry Morozovsky" <marck@rinet.ru>, <scotty@klement.dstorm.net>
Cc: "Dmitry Valdov" <dv@dv.ru>,
	"Bill Moran" <wmoran@potentialtech.com>, <stable@FreeBSD.ORG>,
	<sos@FreeBSD.ORG>
References: <20020124224757.O60455-100000@woozle.rinet.ru>
Subject: Re: ATA driver feature request
Date: Thu, 24 Jan 2002 11:53:50 -0800
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----- Original Message -----
From: "Dmitry Morozovsky" <marck@rinet.ru>
To: <scotty@klement.dstorm.net>
Cc: "Dmitry Valdov" <dv@dv.ru>; "Bill Moran" <wmoran@potentialtech.com>;
<stable@FreeBSD.ORG>; <sos@FreeBSD.ORG>
Sent: Thursday, January 24, 2002 11:50 AM
Subject: Re: ATA driver feature request


> On Tue, 22 Jan 2002 scotty@klement.dstorm.net wrote:
>
> [snip]
>
> > > Yes. When I disconnect secondary (non ATA-66/100 compliant) drive from
this
> > > cable, FreeBSD use ATA-100 on primary.
> >
> > atapci0: <VIA 82C686 ATA66 controller> port 0xd000-0xd00f at device 7.1
on pci0
> > ata0: at 0x1f0 irq 14 on atapci0
> > ata1: at 0x170 irq 15 on atapci0
> > . . .
> > ad0: 19458MB <ST320420A> [39535/16/63] at ata0-master UDMA66
> > ad1: 76319MB <WDC WD800BB-40BSA0> [155061/16/63] at ata0-slave UDMA66
> > ata1-master: DMA limited to UDMA33, non-ATA66 compliant cable
> > ad2: 76319MB <WDC WD800BB-40BSA0> [155061/16/63] at ata1-master UDMA33
> > ad3: 2503MB <FUJITSU MPA3026ATU> [5086/16/63] at ata1-slave UDMA33
> >
> > They are the exact same drives using the exact same cable.  My
controller
> > only supports UDMA66, not 100...   but the reason that the 2nd
controller
> > seems to print out "non-ATA66 compiant cable" appears to simply be that
> > ad3 is only ATA33 capable.
> >
> > Just thought I'd pipe up, since the subject came up :)
>
> Hmm, can ever ATA controller clock out both master device at 66MHz and
> slave at 33MHz? I suppose the effect is *not* unexpected.
>
> However, the warning message would be slightly reworded like "non-ATA66
> compliant cable or second device"
>

That is the biggest drawback of ide i thought, itso nly as fast as the
slowest device on the controller...

--Larry


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