c-user: Update references to --enable-* configure options.

Also updated list of SMP architectures and added enough lead in
to let users know the source code was the definitive answer.

c-user/config/general.rst

@@ -437,9 +437,9 @@ Each processor needs an IDLE task stack and interrupt stack for example.
 If there are more processors available than configured, the rest will be
 ignored.
 
-This configuration option is only evaluated in SMP configurations (e.g. RTEMS
+This configuration option is only evaluated in SMP configurations of RTEMS
-was built with the ``--enable-smp`` build configuration option).  In all
+(e.g. RTEMS was built with the SMP build configuration option enabled).
-other configurations it has no effect.
+In all other configurations it has no effect.
 
 .. rubric:: CONSTRAINTS:
 

c-user/config/mpci.rst

@@ -23,12 +23,13 @@
 Multiprocessing Configuration
 =============================
 
-This section describes multiprocessing related configuration options.  The
+This section describes multiprocessing related configuration options.
-options are only used if RTEMS was built with the ``--enable-multiprocessing``
+The options are only used if RTEMS was built when the multiprocessing
-build configuration option.  Additionally, this class of configuration options
+build configuration option is enabled. The multiprocessing configuration
-are only applicable if the configuration option :ref:`CONFIGURE_MP_APPLICATION`
+is distinct from the SMP configuration.  Additionally, this class of
-is defined.  The multiprocessing (MPCI) support must not be confused with the
+configuration options are only applicable if the configuration option
-SMP support.
+:ref:`CONFIGURE_MP_APPLICATION` is defined.  The multiprocessing (MPCI)
+support must not be confused with the SMP support.
 
 .. Generated from spec:/acfg/if/mp-extra-server-stack
 
@@ -115,8 +116,8 @@ options are assumed to be provided.
 .. rubric:: NOTES:
 
 This configuration option shall be undefined if the multiprocessing support
-is not enabled (e.g. RTEMS was built without the ``--enable-multiprocessing``
+is not enabled (e.g. RTEMS was built without the multiprocessing build
-build configuration option).  Otherwise a compile time error in the
+configuration option enabled).  Otherwise a compile time error in the
 configuration file will occur.
 
 .. Generated from spec:/acfg/if/mp-max-global-objects

c-user/config/posix-api.rst

@@ -25,7 +25,7 @@ POSIX API Configuration
 
 This section describes configuration options related to the POSIX API.  Most
 POSIX API objects are available by default since RTEMS 5.1.  The queued signals
-and timers are only available if RTEMS was built with the ``--enable-posix``
+and timers are only available if RTEMS was built with the enable POSIX
 build configuration option.
 
 .. Generated from spec:/acfg/if/max-posix-keys
@@ -231,8 +231,8 @@ API Queued Signals that can be concurrently active.
 
 Unlimited objects are not available for queued signals.
 
-Queued signals are only available if RTEMS was built with the
+Queued signals are only available if RTEMS was built with the POSIX API
-``--enable-posix`` build configuration option.
+build configuration option enabled.
 
 .. rubric:: CONSTRAINTS:
 
@@ -470,29 +470,33 @@ API Timers that can be concurrently active.
 This object class can be configured in unlimited allocation mode, see
 :ref:`ConfigUnlimitedObjects`.
 
-Timers are only available if RTEMS was built with the
+Timers are only available if RTEMS was built with the POSIX API build
-``--enable-posix`` build configuration option.
+configuration option enabled.
 
 .. rubric:: CONSTRAINTS:
 
 The following constraints apply to this configuration option:
 
-* The value of the configuration option shall be greater than or equal to zero.
+* The value of the configuration option shall be greater than or equal
+to zero.
 
-* The value of the configuration option shall be less than or equal to 65535.
+* The value of the configuration option shall be less than or equal
+to 65535.
 
 * The value of the configuration option shall be less than or equal to a
-  BSP-specific and application-specific value which depends on the size of the
+  BSP-specific and application-specific value which depends on the size
-  memory available to the application.
+  of the memory available to the application.
 
 * The value of the configuration option may be defined through
   :c:func:`rtems_resource_unlimited` the enable unlimited objects for the
   object class, if the value passed to :c:func:`rtems_resource_unlimited`
   satisfies all other constraints of the configuration option.
 
-* The value of the configuration option shall be zero if the POSIX API is not
+* The value of the configuration option shall be zero if the POSIX API
-  enabled (e.g. RTEMS was built without the ``RTEMS_POSIX_API = True`` build
+is not
-  configuration option).  Otherwise a compile time error in the configuration
+  enabled (e.g. RTEMS was built without the ``RTEMS_POSIX_API = True``
+  build configuration option).  Otherwise a compile time error in the
+  configuration
   file will occur.
 
 .. Generated from spec:/acfg/if/min-posix-thread-stack-size

c-user/symmetric_multiprocessing_services.rst

@@ -13,10 +13,19 @@ Symmetric Multiprocessing (SMP)
 Introduction
 ============
 
-The Symmetric Multiprocessing (SMP) support of the RTEMS is available on
+RTEMS Symmetric Multiprocessing (SMP) support is available on a subset
+of target architectures supported by RTEMS. Further on some target
+architectures, it is only available on a subset of BSPs. The user is
+advised to check the BSP specific documentation and RTEMS source code
+to verify the status of SMP support for a specific BSP. The following
+architectures have support for SMP:
+
+-- AArch64
 
 - ARMv7-A,
 
+- i386,
+
 - PowerPC,
 
 - RISC-V, and
@@ -25,8 +34,8 @@ The Symmetric Multiprocessing (SMP) support of the RTEMS is available on
 
 .. warning::
 
-    The SMP support is only available if RTEMS was built with the
+    SMP support is only available if RTEMS was built with the
-    ``--enable-smp`` build configuration option.
+    SMP build configuration option enabled.
 
 RTEMS is supposed to be a real-time operating system.  What does this mean in
 the context of SMP?  The RTEMS interpretation of real-time on SMP is the
@@ -580,10 +589,10 @@ Profiling
 ---------
 
 To identify the bottlenecks in the system, support for profiling of low-level
-synchronization is optionally available.  The profiling support is a BSP build
+synchronization is optionally available.  The profiling support is
-time configuration option (``--enable-profiling``) and is implemented with an
+an RTEMS build time configuration option and is implemented with an
-acceptable overhead, even for production systems.  A low-overhead counter for
+acceptable overhead, even for production systems.  A low-overhead counter
-short time intervals must be provided by the hardware.
+for short time intervals must be provided by the hardware.
 
 Profiling reports are generated in XML for most test programs of the RTEMS
 testsuite (more than 500 test programs).  This gives a good sample set for