Date: Mon, 19 Oct 1998 15:25:00 -0700 From: Mike Smith <mike@smith.net.au> To: sthaug@nethelp.no Cc: freebsd-current@FreeBSD.ORG, freebsd-hardware@FreeBSD.ORG Subject: Re: Problems with Digital server with P-166 and Neptune chipset Message-ID: <199810192225.PAA01755@dingo.cdrom.com> In-Reply-To: Your message of "Mon, 19 Oct 1998 23:36:15 %2B0200." <17857.908832975@verdi.nethelp.no>
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> The problems I see *may* be the fault of the PCI chipset. On > http://www.freebsd.org/handbook/handbook138.html, it says: > > Neptune: > > Can not run more than 2 bus master devices. Admitted Intel design > flaw. Workarounds include do not run more than 2 bus masters, special > hardware design to replace the PCI bus arbiter (appears on Intel > Altair board and several other Intel server group MB's). And of course > Intel's official answer, move to the Triton chip set, we ``fixed it > there''. > > I don't know any more about the Neptune problem than what I've seen on > this Web page. The actual behavior I see is sudden reboots without any > apparent cause - and no messages in the system logs. The system *has* > more than two bus master devices (21140 Ethernet card, two Buslogic > Multimaster SCSI controllers, 7 SCSI disks, SCSI CDROM, SCSI tape). > > On the other hand, Patrick Duffy's "PCI Chipsets" list says about the > Neptune: > > Rev. 1: (problems mentioned) > > Rev. 2: This chipset is in boards shipped by Intel to vendors as of > about mid August 1994. It has no reported problems (and works > well in my system). > > The system I have may be Rev. 2: > > chip0: <Intel 82434NX (Neptune) PCI cache memory controller> rev 0x11 on pci0.0.0 > > (/sys/pcisupport.c lists rev 16 and 17 as Neptune - so my guess, without > checking the Intel data sheet, is that I have a Neptune rev. 2 chipset.) > > Any good hints on where I should start looking to find the cause of the > sudden reboots? Well, I'd start by going back to just 2 bus masters for starters. > Oh yeah, the two Buslogic SCSI controllers appear in the kernel config > file as ISA controllers: > > controller bt0 at isa? port ? cam irq ? > controller bt1 at isa? port ? cam irq ? > > but they are very definitely PCI controllers: This may be a leftover from the way the old bt driver used to handle PCI instances. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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