From owner-freebsd-hackers Thu Feb 9 06:31:45 1995 Return-Path: hackers-owner Received: (from root@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id GAA10282 for hackers-outgoing; Thu, 9 Feb 1995 06:31:45 -0800 Received: from relay2.UU.NET (relay2.UU.NET [192.48.96.7]) by freefall.cdrom.com (8.6.9/8.6.6) with ESMTP id GAA10274 for ; Thu, 9 Feb 1995 06:31:43 -0800 Received: from news.cs.utexas.edu by relay2.UU.NET with SMTP id QQycis16778; Thu, 9 Feb 1995 09:30:57 -0500 Received: from mail.cs.utexas.edu (root@mail.cs.utexas.edu [128.83.139.10]) by news.cs.utexas.edu (8.6.9/8.6.9) with ESMTP id IAA01646; Thu, 9 Feb 1995 08:30:56 -0600 Received: from uudell.us.dell.com (uudell.us.dell.com [143.166.224.6]) by mail.cs.utexas.edu (8.6.9/8.6.9) with SMTP id IAA10334; Thu, 9 Feb 1995 08:30:57 -0600 Received: from obiwan by uudell.us.dell.com (5.67/dns1.3) with UUCP id AA21316; Thu, 9 Feb 95 14:22:26 GMT Received: by obiwan.uucp (Smail3.1.29.1 #4) id m0rcZQx-00030ZC; Thu, 9 Feb 95 08:01 CST Message-Id: From: obiwan!bob@uudell.us.dell.com (Bob Willcox) Subject: Re: FreeBSD with Bustec BT-542B SCSI interface To: joerg_wunsch@uriah.sax.de Date: Thu, 9 Feb 1995 08:01:23 -0600 (CST) Cc: Pat_Barron@transarc.com, hackers@FreeBSD.org In-Reply-To: <199502061749.SAA17102@bonnie.tcd-dresden.de> from "J Wunsch" at Feb 6, 95 06:49:13 pm X-Mailer: ELM [version 2.4 PL23] Content-Type: text Content-Length: 1739 Sender: hackers-owner@FreeBSD.org Precedence: bulk J Wunsch wrote: > All my problems went away with the following steps: > > . use the bt driver, > . disable ISA DMA emulation from the EISA setup, > . configure the board to use level-triggered interrupts, and Hmm, I didn't realize the bt742a.c device driver would work with level triggered interrupts. Does that mean that I can put multiple BT747S's on the same IRQ? > . configure my board to use an ISA clock close to the standard 8 MHz > (it's been 6 MHz before due to a bad floppy controller, but the > Bt 742 refused to work at this clock) This reminds me of the strangeness of one of my systems here with a BT747S (actually, 3 of them and they *all* behave the same way on this). When I updated the system from a 486DX2/66 to a 486DX2/80 I (obviously) had to increase the MB oscillator to 40MHz (from 33MHz). In doing this I set my bus speed to CPUCLK/5 (i.e., 8MHz). At that speed, I could boot off of the hard disk but *not* the floppy! (At the old 33MHz speed I had the bus speed set to CPUCLK/4 [8.3333MHz] and that worked.) So, I tried the 7.159MHz bus speed. With that, I could boot from the floppy again but now the hard disk failed to boot!! I finally settled on CPUCLK/4 (again, only now the bus speed is 10MHz) and both floppy and hard disk boot...go figure????? Has anybody else seen this kind of wierd behavior with the Buslogic BT-747S cards? As I said above, I have 3 of these cards in the system did try the others (for floppy connection). They all failed to boot the floppy at a bus speed of 8MHz. -- Bob Willcox ...!{rutgers|ames}!cs.utexas.edu!uudell!obiwan!bob Austin, TX or try: @uudell.us.dell.com:obiwan!bob 512-258-4224 (home), 512-838-3914 (work)