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Date: Sat, 11 Feb 2006 08:43:08 -0500
To: Paolo Maero <paolo@euresis.it>, FreeBSD Stable <freebsd-stable@freebsd.org>
From: Mike Tancsa <mike@sentex.net>
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Subject: Re: IDE DMA Timeouts
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At 05:37 PM 10/02/2006, Paolo Maero wrote:

>I have a 2xPIII 700 MHz SMP system with Maxtor PCI SATA controller
>and two 250 GB Maxtor disks, plus SCSI disks for the OS.
>
>atapci0: <Promise PDC20375 SATA150 controller> port 0x3080-0x30bf, 
>0x30c0-0x30cf,0x3000-0x307f mem 0xf4220000-0xf4220fff, 
>0xf4200000-0xf421ffff irq 20 at device 4.0 on pci2
>ad4: 239372MB <Maxtor 7L250S0 BANC1E00> at ata2-master SATA150
>ad6: 239372MB <Maxtor 7L250S0 BANC1E00> at ata2-master SATA150

Your problem might be due to a specific issue with the promise controller

see
http://lists.freebsd.org/pipermail/freebsd-stable/2006-February/022407.html

         ---Mike