Copyright (c) 2002 The NetBSD Foundation, Inc.
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by Martin Husemann <martin (at] NetBSD.ORG>.
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.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 07:10:07 GMT 2025