SVR5 and SCO OpenServer
data format of the MCA device configuration space
MCA device configuration space
is persistent memory provided
by the hardware/firmware associated with
an MCA bus
that is used to store parameters
of the devices attached to the bus.
Device configuration space for MCA devices
is simply an array of uchar_t bytes,
one for each of the eight POS (Programmable Option Select) registers.
DDI access to MCA configuration information
ODDI access to MCA configuration information
SCO OpenServer drivers can access
MicroChannel device configuration information.
The Programmable Option Select (POS) registers
on a MicroChannel machine
can be read but should not be written by device drivers.
In particular, MicroChannel drivers
should never change any adapter settings
that are configurable
through the standard MicroChannel device configuration process
involving reference floppies and option disks.
x86/Pentium compatible architectures
1, 2, 3, 4, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp
1, 2, 2mp, 3, 3mp, 4, 4mp, 5, 5mp
SCO OpenServer and SVR5 compatibility
The configuration space layout is determined
by industry standards boards;
drivers written for SVR5 and SCO OpenServer
access the same configuration space,
although they use different methods for that access.
``MicroChannel configuration information'' in HDK Technical Reference
19 June 2005
© 2005 The SCO Group, Inc. All rights reserved.
OpenServer 6 and UnixWare (SVR5) HDK - June 2005