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Date: Wed, 18 Feb 1998 20:07:50 +0900 (JST)
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Subject: i386/5779: BOUNCE_BUFFERS option in LINT needs modification.
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>Number:         5779
>Category:       i386
>Synopsis:       BOUNCE_BUFFERS option in LINT needs modification.
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed Feb 18 03:10:04 PST 1998
>Last-Modified:
>Originator:     Takashi Saeki <saeki@jp.freebsd.org>
>Organization:
jp.freebsd.org
>Release:        FreeBSD 2.2.5-STABLE i386
>Environment:

	All FreeBSD System with kernel sources.

>Description:

	The description of BOUNCE_BUFFERS option
	in /usr/src/sys/i386/conf/LINT is incorrect, I think.

	"# BOUNCE_BUFFERS provides support for ISA DMA on machines with more"
	"# than 16 megabytes of memory.  It doesn't hurt on other machines."
	"# Some broken EISA and VLB hardware may need this, too."

	As far as I know, BOUNCE_BUFFERS option affects ISA
	(and broken EISA / VLB) bus-master SCSI adapter card only.
	All ISA DMA device with the exception of ISA bus-master SCSI
	adapter card use another bounce buffer mechanism, isa_dma*() or
	driver's own one. So they do not need BOUNCE_BUFFER at all.

>How-To-Repeat:

	Install kernel sources, and read /usr/src/sys/i386/conf/LINT.

>Fix:
	
	Make modification like this.

	"# BOUNCE_BUFFERS provides support for ISA bus-master SCSI adapter"
	"# card on machines with more than 16 megabytes of memory."
	"# Some broken EISA and VLB hardware may need this, too."
	"# If you do not have these devices, make this option commented out."

	Sample configuration files (GENERIC, ...) need modification, too.
	
	"options		BOUNCE_BUFFERS		#ISA busmaster SCSI + >16MB system only"

>Audit-Trail:
>Unformatted:

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