Copyright (c) 2002 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Martin Husemann <martin (at] NetBSD.ORG>.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the NetBSD
Foundation, Inc. and its contributors.
4. Neither the name of The NetBSD Foundation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd March 29, 2001 .Dt NELL 4 sparc .Os .Sh NAME .Nm nell .Nd sbus pcmcia bridge .Sh SYNOPSIS .Cd "nell* at sbus? slot ? offset ? flags 0" .Cd "pcmcia* at nell? controller ? socket ?" .Sh DESCRIPTION The .Nm is a pcmcia bridge for the sbus. It is also known as STP4020, the name of the chipset used to implement it, and has SUN part number 501-2367.
p The firmware assigns two interrupt levels to the nell, but the driver only needs a single interrupt. Depending on distribution of interrupt levels on your machine you might prefer the driver to use either the first (use flags value 0) or the second (use flags value 1). .Sh SEE ALSO .Xr pcmcia 4 , .Xr sbus 4 .Sh BUGS The driver provides a big-endian pcmcia bus, which is wrong in the .Nx context. Due to missing/incomplete documentation of the chipset it is not known for sure if the hardware has any byteswapping mode. For sparc64 systems this can easily be worked around in software, so this will be fixed. For sparc systems, the fix might impose a serious performance degration and is subject of further research.
p This means that currently some cards will work (because they are using 8 bit access only), including com and ray cards. Most cards will not work. For the wi driver, there is a hack to make it accept a big-endian bus. Be sure to only use it if this is the only wi card in your system:
p .Cd "options WI_AT_BIGENDIAN_BUS_HACK" .Cd "wi* at pcmcia? function ?"
Indexes created Thu Oct 02 10:09:58 GMT 2025