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Subject: kern/23314: aic driver fails to detect Adaptec 1520B unless PnP is disabled
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>Number:         23314
>Category:       kern
>Synopsis:       aic driver fails to detect Adaptec 1520B unless PnP is disabled on the adapter
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 05 17:30:01 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     John Merryweather Cooper
>Release:        FreeBSD 4.1-RELEASE i386
>Organization:
>Environment:

	CPU:  AMD K6-2/533
	RAM:  128 Megs
	Motherboard:  DFI K6BV3+ /66
	Motherboard BIOS:  Award v.4.51pg (DFI 07/07/2000)
	SCSI Adapter:  Adaptec 1520B
	Connections to Adapter:  AIWA TD-20001 Travan/NS-20 Tape Drive

>Description:

	aic driver fails to detect Adaptec 1520B adapter with adapter BIOS set to default
	configuration.  Disabling PnP mode in the adapter BIOS and manually reserving
	IRQ 11 in the motherboard BIOS causes the aic driver to detect the adapter. 

>How-To-Repeat:

	Merely set the Adaptec 1520B to its default configuration in my environment and the
	aic driver will fail to detect 100% of the time.  All other SCSI drivers have been
	removed from the kernel with no effect (other than reduced kernel size).

>Fix:

	The work-around is to disable the Adaptec 1520B's PnP feature in its BIOS using it's
	BIOS utility (press Ctrl-A when the Adaptec copyright screen comes up) and reserve
	IRQ 11 for the adapter in the PCI/PNP section of the configuration program for the
	motherboard BIOS.


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


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