From nobody@FreeBSD.org  Sun Sep 23 07:28:23 2001
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Date: Sun, 23 Sep 2001 07:28:23 -0700 (PDT)
From: David Hedley <david@hedley.org>
To: freebsd-gnats-submit@FreeBSD.org
Subject: Ability to specify max UDMA level
X-Send-Pr-Version: www-1.0

>Number:         30762
>Category:       kern
>Synopsis:       Ability to specify max UDMA level
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          wish
>Submitter-Id:   current-users
>Arrival-Date:   Sun Sep 23 07:30:00 PDT 2001
>Closed-Date:    Sun Sep 23 08:26:08 PDT 2001
>Last-Modified:  Mon Sep 24 00:50:01 PDT 2001
>Originator:     David Hedley
>Release:        4.4-RELEASE
>Organization:
Intelligent Network Technology Ltd
>Environment:
>Description:

It would be nice to be able to specify a maximum UDMA level with the ATA driver.

e.g. I use the Promise TX2/100 card which supports up to UDMA5, however running it at this speed in my current chassis generates many CRC errors. I would like to be able to force it to use UDMA4 max.
>How-To-Repeat:

>Fix:

I currently manually patch ata_umode in dev/ata/ata-all.c

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: sos 
State-Changed-When: Sun Sep 23 08:26:08 PDT 2001 
State-Changed-Why:  

This is possible in -current using the atacontrol utility,  
however if and when this will be backported to 4.x-stable 
is not determined yet. 


http://www.FreeBSD.org/cgi/query-pr.cgi?pr=30762 

From: George Reid <greid@FreeBSD.org>
To: David Hedley <david@hedley.org>
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: kern/30762: Ability to specify max UDMA level
Date: Sun, 23 Sep 2001 18:39:18 +0100

 On Sun, Sep 23, 2001 at 07:28:23AM -0700, David Hedley wrote:
 > >Fix:
 > 
 > I currently manually patch ata_umode in dev/ata/ata-all.c
 
 Such a facility already exists in the form of the ``hw.atamodes'' sysctl.
 
 ~greid

From: =?iso-8859-1?q?David=20Hedley?= <david_hedley@yahoo.com>
To: George Reid <greid@FreeBSD.org>
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: kern/30762: Ability to specify max UDMA level
Date: Mon, 24 Sep 2001 08:48:06 +0100 (BST)

 As of 4.4-REL hw.atamodes allows switching between PIO and DMA, not between
 different UDMA levels.
 
 David
 
  --- George Reid <greid@FreeBSD.org> wrote: 
 > On Sun, Sep 23, 2001 at 07:28:23AM -0700, David Hedley wrote:
 > > >Fix:
 > > 
 > > I currently manually patch ata_umode in dev/ata/ata-all.c
 > 
 > Such a facility already exists in the form of the ``hw.atamodes'' sysctl.
 > 
 > ~greid
 > 
 > 
 >  
 
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>Unformatted:
