From owner-freebsd-current Fri Apr 18 10:19:33 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id KAA19299 for current-outgoing; Fri, 18 Apr 1997 10:19:33 -0700 (PDT) Received: from Sisyphos.MI.Uni-Koeln.DE (Sisyphos.MI.Uni-Koeln.DE [134.95.212.10]) by freefall.freebsd.org (8.8.5/8.8.5) with SMTP id KAA19294 for ; Fri, 18 Apr 1997 10:19:30 -0700 (PDT) Received: from x14.mi.uni-koeln.de (annexr2-48.slip.Uni-Koeln.DE) by Sisyphos.MI.Uni-Koeln.DE with SMTP id AA27180 (5.67b/IDA-1.5 for ); Fri, 18 Apr 1997 19:19:15 +0200 Received: (from se@localhost) by x14.mi.uni-koeln.de (8.8.5/8.6.9) id TAA09121; Fri, 18 Apr 1997 19:19:14 +0200 (CEST) Message-Id: <19970418191914.13948@x14.mi.uni-koeln.de> Date: Fri, 18 Apr 1997 19:19:14 +0200 From: Stefan Esser To: Satoshi Asami Cc: jkh@time.cdrom.com, james@nexis.net, current@freebsd.org Subject: Re: NCR 53c875 support broken in 2.2.1. References: <4220.861251094@time.cdrom.com> <199704170501.WAA19842@silvia.HIP.Berkeley.EDU> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.68 In-Reply-To: <199704170501.WAA19842@silvia.HIP.Berkeley.EDU>; from Satoshi Asami on Wed, Apr 16, 1997 at 10:01:49PM -0700 Sender: owner-current@freebsd.org X-Loop: FreeBSD.org Precedence: bulk On Apr 16, Satoshi Asami wrote: > * It's a Quantum XP34300W drive, according to the ID string at probe > * time > > I see. Then it should work fine. I wonder why 875 is different then, > it's not Ultra-SCSI anyway (I've used the same model with 825 > successfully).... There is one significant difference: All 53c825 cards use a 40MHz oscillator, while some 53c875 cards come with an 80MHz crystal ... The driver uses hints from the BIOS, and falls back to measuring the oscillator frequency, if nothing else works. Recent 53c875 cards seem to use the clock doubler and an external 40MHz clock, and that is what the 2.1.x version of the NCR driver assumed. It is possible, that Jordans card is 40MHz, but appears to have some other frequency as seen by the NCR driver's init code. (I tested both a 40MHz and a 80MHz driven 875 card in my system, and could not get the probe to fail a single time ...) Regards, STefan