From mboxrd@z Thu Jan 1 00:00:00 1970 To: linuxppc-dev@lists.linuxppc.org Subject: Re: Going from 2.2.12 to 2.2.17pre10 References: Mime-Version: 1.0 (generated by tm-edit 7.108) Content-Type: text/plain; charset=US-ASCII From: Michael Lundkvist Date: 07 Jul 2000 11:47:51 +0200 In-Reply-To: Gabriel Paubert's message of "Fri, 7 Jul 2000 11:21:33 +0200 (METDST)" Message-ID: Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Gabriel Paubert writes: > On 7 Jul 2000, Michael Lundkvist wrote: > > > I have to be able to create a standalone system so network boot is not > > an option. > > Sigh, and falshing the kernel neither I suppose... > If I can find a stable version it is an option. And I actually have plenty of time to look. I need a rock-stable system by the end of this year. > > Fine, but 2.2.16 is claimed to have other problems (look at Alan's release > notes for each 2.2.17-pre). > I'll try 2.2.17pre10 tonight and see if I have more luck with that. > > I have tried two MVME-2400 boards but I haven't had time to do any > > systematic testing. It always crashes in find_buffer in fs/buffer.c > > during moderate to heavy disk activity. I'm starting to suspect that > > the CMD646 isn't being setup correctly since it feels like the system > > was more stable after a cold reboot. I'll have to test it a bit more. > > Ok, that's likely the cause. SCSI (NCR) disk access is rock solid here on > MVME2600. > I guess I should talk to Ramix. They have been helpful before. I'll also try to go back to an older version of the CMD646-driver. There are a few timing related setup changes in the newer versions. > > No, it's not the backplane, it's the implementation in the MVME boards: > > > PCI bus <-> Universe <-> Layer of buffers <-> VME connectors > > The PCI bus is probably largely buried inside the PCB layers. > The Universe is a BGA. > The VME bus has only one (bidirectional) reset signal. > > However there are 2 VME reset signal buffer, one inwards and one outwards > for 2 pins of the Universe (VME reset in and VME reset out). > > Universe Buffers VME connector > > VXSYSRST-------|>o--+ > |--------SYSRST* > VRSYSRST#------<|---+ > > The only accessible place (with adequate lab equipment) are the buffers: > cut the input or the output of the receive buffer and connect it to the > power supply (safer on the input since it can directly be connected to > the buffer power supply while I'm not sure that some versions of the > Universe are not 3.3V only) . > OK. Then it looks quite possible. Thanks for the info. /Micke ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/