Date: Fri, 18 Apr 1997 19:19:14 +0200 From: Stefan Esser <se@freebsd.org> To: Satoshi Asami <asami@vader.cs.berkeley.edu> Cc: jkh@time.cdrom.com, james@nexis.net, current@freebsd.org Subject: Re: NCR 53c875 support broken in 2.2.1. Message-ID: <19970418191914.13948@x14.mi.uni-koeln.de> In-Reply-To: <199704170501.WAA19842@silvia.HIP.Berkeley.EDU>; from Satoshi Asami on Wed, Apr 16, 1997 at 10:01:49PM -0700 References: <4220.861251094@time.cdrom.com> <199704170501.WAA19842@silvia.HIP.Berkeley.EDU>
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On Apr 16, Satoshi Asami <asami@vader.cs.berkeley.edu> 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
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