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diff --git a/spec/acfg/RTEMS-ACFG-FILESYSTEM.yml b/spec/acfg/RTEMS-ACFG-FILESYSTEM.yml
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+SPDX-License-Identifier: CC-BY-SA-4.0
+active: true
+appl-config-group-description: |
+  This section describes configuration options related to filesytems.
+  By default, the In-Memory Filesystem (IMFS) is used as the base filesystem (also
+  known as root filesystem).  In order to save some memory for your application,
+  you can disable the filesystem support with the
+  :ref:`CONFIGURE_APPLICATION_DISABLE_FILESYSTEM` configuration option.
+  Alternatively, you can strip down the features of the base filesystem with the
+  :ref:`CONFIGURE_USE_MINIIMFS_AS_BASE_FILESYSTEM` and
+  :ref:`CONFIGURE_USE_DEVFS_AS_BASE_FILESYSTEM` configuration options.  These
+  three configuration options are mutually exclusive.  They are intended for an
+  advanced application configuration.
+
+  Features of the IMFS can be disabled and enabled with the following
+  configuration options:
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_CHMOD`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_CHOWN`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_LINK`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_MKNOD`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_MKNOD_FILE`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_MOUNT`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_READDIR`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_READLINK`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_RENAME`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_RMNOD`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_SYMLINK`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_UNMOUNT`
+
+  * :ref:`CONFIGURE_IMFS_DISABLE_UTIME`
+
+  * :ref:`CONFIGURE_IMFS_ENABLE_MKFIFO`
+appl-config-group-name: Filesystem Configuration
+copyrights:
+- Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
+derived: false
+enabled-by: []
+header: ''
+interface-type: appl-config-group
+level: 1.6
+links:
+- RTEMS-APPLCONFIG: _UBhDG0InGYgvxZhg-cUyh3flgj_xCc4GH8Rs0qjazE=
+normative: true
+ref: ''
+reviewed: guzvijvCL3KNldxRZblk0dG3MnBE2BNDLRci3Rthhj8=
+text: ''
+type: interface