*BSD News Article 30670


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From: soulard@corto.inria.fr (Herve Soulard)
Newsgroups: comp.os.linux.misc,comp.os.linux.development,comp.os.386bsd.development,comp.os.386bsd.questions,comp.sys.ibm.pc.hardware.systems,comp.sys.ibm.pc.hardware.storage,comp.sys.ibm.pc.hardware.misc,comp.periphs.scsi
Subject: BusLogi 445S and DMA Channel
Date: 22 May 1994 12:34:36 GMT
Organization: INRIA
Lines: 45
Sender: soulard@alix.inria.fr (Herve Soulard)
Distribution: world
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Keywords: scsi buslogic bt445s


Hello,

I've just bought a BusLogic BT445S and I've a problem with the
DMA channel. When I load the BusLogic DOS Manager, it reports that
no DMA channel is used. The same thing is reported by the NetBSD
installtion disk. I've read many times the Installation Guide, and
nowhere I've seen the switches to use to set the DMA channel.

Does somebody know how to solve this problem ?

Here are the characteristics of my system :

	Orchid SuperBoard 486 DX2/66 VLB
	AMI Bios 06/06/92
	20 Mbytes of RAM
	
	DC-200 Promise ISA IDE Cache Controller
	with 4 MBytes of cache
	250 Mbytes Maxtor IDE Disk
	340 MBytes Maxtor IDE Disk
	
	BusLogic 445S
	BIOS Version 4.72
	FIRMWARE 3.37
	40 MBytes SCSI Disk with ID 2
	(1GBytes DEC disk is ordered)
	
	Cirrus Logic 5426 VLB Video Card
	2Mo of video memory.
	

The SCSI card works fine with DOS and with Linux 1.1.11. The
only problem is that the DMA channel is not set.

I've also tried the DMA test from the BIOS of the BT445S
(g=dc00:9 under debug) and it reports no errors.

So what is wrong ?

Thanks for any future help.

		Herve Soulard.

PS: I would prefer email answers.