Date: Fri, 30 Jun 2000 09:38:03 +0200 From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> To: Andre Albsmeier <andre@internal.FreeBSD.ORG>, SUCCESS@FreeBSD.ORG, FAILURE@curry.mchp.siemens.de, DELAY@curry.mchp.siemens.de Cc: "Kenneth D. Merry" <ken@kdm.org>, Andre Albsmeier <andre.albsmeier@mchp.siemens.de>, freebsd-scsi@freebsd.org, gibbs@freebsd.org Subject: Re: Curiuos Problem with CAM and a 2940U2W with several devices Message-ID: <20000630093803.A1035@curry.mchp.siemens.de> In-Reply-To: <20000630082310.A8783@curry.mchp.siemens.de>; from andre@curry.mchp.siemens.de on Fri, Jun 30, 2000 at 08:23:10AM %2B0200 References: <20000629080730.A66792@curry.mchp.siemens.de> <20000629125305.A61135@panzer.kdm.org> <20000630082310.A8783@curry.mchp.siemens.de>
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[ Now CC'ing Justin myself ] On Fri, 30-Jun-2000 at 08:23:10 +0200, Andre Albsmeier wrote: > > ... > > Today in the morning I have investigated this further, it is really > curious. I will sum up all what I have done to make it easier to > understand. I will just desribe what was attached to the 2940U2W > and what happend. The connectors are referred to as follows: > > LVD-ext: external accessible LVD connector of the 2940U2W > LVD-int: the internal LVD connector > 50p-int: the SE 50 pin connector > 68p-int: the SE 68 pin connector > > LVD-Trm and SE-Trm will show the settings of the two corresponding > entries in the 2940U2W BIOS. > If any cable was attached to any connector, it was terminated properly > with an appropriate, active terminator. > > The 2940U2W was flashed with BIOS 2.57.2. > > The word "Errors" means errors in the dmesg already during the > boot phase when booting with 'boot -s'. These errors are always > as being written in my previous mail. > Quoting myself but there are interesting news: I can easily reproduce the problem on a different machine with another 2940U2W: da0: <QUANTUM XP32275W LYK8> Fixed Direct Access SCSI-2 device da1: <QUANTUM XP32275W LYK8> Fixed Direct Access SCSI-2 device da2: <QUANTUM XP34550W LYK8> Fixed Direct Access SCSI-2 device da3: <QUANTUM XP34550W LYK8> Fixed Direct Access SCSI-2 device da4: <FUJITSU MAE3182LP 5210> Fixed Direct Access SCSI-2 device cd0: <TEAC CD-ROM CD-532S 1.0A> Removable CD-ROM SCSI-2 device This is the configuration: LVD-ext: noting LVD-int: MAE3182LP LVD LVD-Trm: enable 50p-int: CD-532S 68p-int: all Quantum drives from above SE-Trm : low/off high/on Result : errors (someone reset channel A, ...) But as soon as I remove one of the 3 connected cables (no matter if it is LVD-int, 50p-int or 68p-int) and adjust the termination settings properly, it works. I already wanted to send this email when I got another idea: LVD-ext: nothing LVD-int: only a terminated cable LVD-Trm: enable 50p-int: only a terminated cable 68p-int: all Quantum drives from above SE-Trm : low/off high/on Result : errors (someone reset channel A, ...), as expected And here comes the funny thing: LVD-ext: nothing LVD-int: only a terminated cable BUT TERMINATED WITH AN SE TERMINATOR LVD-Trm: enable 50p-int: only a terminated cable 68p-int: all Quantum drives from above SE-Trm : low/off high/on Result : works As a result we can say: It fails if both of the SE connectors are in use and an LVD path is connected to the LVD-int connector. When using an SE path on the LVD-int connector it works. The funny thing is that Winblows95 has no problems with all of the above configurations. So I slowly might come to the point that there is indeed a problem with the way how FreeBSD uses the 2940U2W. First, I thought it would be one of the devices but as we can see, this isn't the case. Since I have now reproduced the problem on my own machine, I can easily test any suggestions in order to fix this. Thanks, -Andre To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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