2001-09-12 02:52:52 +04:00
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.\" $NetBSD: memc.4,v 1.2 2001/09/11 22:52:56 wiz Exp $
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2001-07-28 22:25:51 +04:00
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.\"
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.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Steve C. Woodford.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd July 28, 2001
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.Dt MEMC 4 mvme68k
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.Os
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.Sh NAME
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.Nm memc
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.Nd MVME162-MVME177 Memory Controller Chip
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.Sh SYNOPSIS
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.Cd "memc* at mainbus0"
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.Sh DESCRIPTION
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The
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.Nm
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devices are used on MVME162, MVME167, MVME172 and MVME177 boards
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to manage one or more DRAM modules.
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.P
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Depending on the type of DRAM module fitted, the device will
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either be a MEMC040 device or an MCECC device. The former manages
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a Parity DRAM module while the latter manages an ECC DRAM module.
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.Sh DIAGNOSTICS
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.Bl -diag -compact
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.It memc0 at mainbus0.
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This is the normal autoconfiguration message indicating that the
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Memory Controller Chip has been found and attached to the main processor
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bus.
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.It memc0: Correctable error on CPU read access to 0x12345678.
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This indicates that an MCECC memory controller detected and corrected
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a single bit error in one of the DRAM banks. There are a few variations
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on the message where "CPU" can be replaced with "Peripheral Device"
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or "Scrubber", and "read" can be substituted for "write".
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This message is followed by some more details which can help pin-point
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the error...
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.It memc0: ECC Syndrome 0x23 (DRAM Bank C, Bit#16).
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Pin-points exactly where the error occurred.
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.It memc0: Uncorrectable error on CPU read access to 0x12345678.
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Errors like this have the potential to corrupt data. As such, it is
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likely the system will panic very soon afterwards.
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.El
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.Sh SEE ALSO
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.Xr mainbus 4 ,
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.Sh BUGS
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2001-09-12 02:52:52 +04:00
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The
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2001-07-28 22:25:51 +04:00
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.Nm
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driver does not yet fully support the MEMC040 (Parity) version
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of the device.
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