read byte from board's NVRAM extension information
int cm_read_devconfig8(rm_key_t key, size_t offset, uchar_t *buf)
cm_read_devconfig8 is used to read a single byte from
the NVRAM extension information associated with a selected
The extension information is specific to the bus
type of the board and exactly what information is read is determined
by the bus driver (for example, the MCA bus driver).
Drivers should not use this routine to read standard board parameters
Rather, such parameters should be acquired via
cm_read_devconfig8 can be used by MCA drivers to
directly read the POS registers.
Resource manager key selecting a particular board instance.
Offset from the beginning of the board's device configuration space
to start the read.
Buffer to hold data to be read.
cm_read_devconfig8 returns 0 for success.
The following errnos are returned for failure:
if rm_key is invalid, buf is NULL or the read fails.
if the board is installed in an ISA bus or the bus doesn't
provide the specified level of granularity.
The caller must not have
a resource manager transaction pending
when this function is called.
Note, even though the
function supports all levels of granularity,
this interface is limited to
those "inherent" on the system
(in other words, there are
bios calls to support them directly).
Context and synchronization
7.1, 7.1mp, 8, 8mp
Differences between versions
In DDI versions 7.1 and 7.1mp,
the offset argument is cast
as size_t rather than an off_t.
When porting drivers from earlier DDI versions,
it is not necessary to modify the type
of the offset argument.
``Autoconfiguration'' in HDK Technical Reference
19 June 2005
© 2005 The SCO Group, Inc. All rights reserved.
OpenServer 6 and UnixWare (SVR5) HDK - June 2005