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List:       freebsd-bugs
Subject:    kern/23913: UDMA 66 Drive forced to PIO4 on DFI AK-74EC (VIA 686B) motherboard
From:       jmcoopr () webmail ! bmi ! net
Date:       2000-12-28 22:11:43
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>Number:         23913
>Category:       kern
>Synopsis:       UDMA 66 Drive forced to PIO4 on DFI AK-74EC (VIA 686B) motherboard
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Dec 28 14:20:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     John Merryweather Cooper
>Release:        FreeBSD 4.2-STABLE i386
>Organization:
>Environment:

	CPU:  Athlon Duron 700
	Motherboard:  DFI AK74-EC, Rev. A2
	Motherboard BIOS:  Award v.6.0 (DFI 11/03/2000)
	Mounting root from ufs:/dev/ad0s1a
	Devices attached to IDE:
		ad0: 12416MB <QUANTUM FIREBALL CX13.0A> [25228/16/63] at ata0-master UDMA66
		acd0: CDROM <CD-ROM 45X> at ata1-master using PIO4
		afd0: 96MB <IOMEGA ZIP 100 ATAPI> [96/64/32] at ata1-slave using PIO3
	80-wire cables are used to connect ALL IDE devices

>Description:

	

On boot I get the following errors:

Mounting root from ufs:/dev/ad0s1a
ad0: UDMA ICRC WRITE ERROR blk# 416191 retrying
ad0: UDMA ICRC WRITE ERROR blk# 416191 retrying
ad0: UDMA ICRC WRITE ERROR blk# 416191 retrying
ad0: UDMA ICRC WRITE ERROR blk# 416191 falling back to PIO mode

Note that UDMA performance is quite good under OS/2 and/or WinDoze ME

>How-To-Repeat:

	

	100% repeatable (always happens--only the block# sometimes changes)
>Fix:

	
	I think this is a timing issue.  I had a similar issue with OS/2 Warp
	until the IDE driver was modified to use somewhat less aggressive IDE
	timings.  Then the issue went away on the OS/2 workstation.  Note that
	this harddrive and cable worked great under UDMA66 with an older
	motherboard (just replaced motherboard these past few days).




>Release-Note:
>Audit-Trail:
>Unformatted:


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