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diff --git a/meta/classes/core-image.bbclass b/meta/classes/core-image.bbclass
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+# Common code for generating core reference images
+#
+# Copyright (C) 2007-2011 Linux Foundation
+
+LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=4d92cd373abda3937c2bc47fbc49d690 \
+                    file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+
+# IMAGE_FEATURES control content of the core reference images
+# 
+# By default we install packagegroup-core-boot and packagegroup-base packages - this gives us
+# working (console only) rootfs.
+#
+# Available IMAGE_FEATURES:
+#
+# - x11                 - X server
+# - x11-base            - X server with minimal environment
+# - x11-sato            - OpenedHand Sato environment
+# - tools-debug         - debugging tools
+# - eclipse-debug       - Eclipse remote debugging support
+# - tools-profile       - profiling tools
+# - tools-testapps      - tools usable to make some device tests
+# - tools-sdk           - SDK (C/C++ compiler, autotools, etc.)
+# - nfs-server          - NFS server
+# - ssh-server-dropbear - SSH server (dropbear)
+# - ssh-server-openssh  - SSH server (openssh)
+# - qt4-pkgs            - Qt4/X11 and demo applications
+# - hwcodecs            - Install hardware acceleration codecs
+# - package-management  - installs package management tools and preserves the package manager database
+# - debug-tweaks        - makes an image suitable for development, e.g. allowing passwordless root logins
+# - dev-pkgs            - development packages (headers, etc.) for all installed packages in the rootfs
+# - dbg-pkgs            - debug symbol packages for all installed packages in the rootfs
+# - doc-pkgs            - documentation packages for all installed packages in the rootfs
+# - read-only-rootfs    - tweaks an image to support read-only rootfs
+#
+FEATURE_PACKAGES_x11 = "packagegroup-core-x11"
+FEATURE_PACKAGES_x11-base = "packagegroup-core-x11-base"
+FEATURE_PACKAGES_x11-sato = "packagegroup-core-x11-sato"
+FEATURE_PACKAGES_tools-debug = "packagegroup-core-tools-debug"
+FEATURE_PACKAGES_eclipse-debug = "packagegroup-core-eclipse-debug"
+FEATURE_PACKAGES_tools-profile = "packagegroup-core-tools-profile"
+FEATURE_PACKAGES_tools-testapps = "packagegroup-core-tools-testapps"
+FEATURE_PACKAGES_tools-sdk = "packagegroup-core-sdk packagegroup-core-standalone-sdk-target"
+FEATURE_PACKAGES_nfs-server = "packagegroup-core-nfs-server"
+FEATURE_PACKAGES_ssh-server-dropbear = "packagegroup-core-ssh-dropbear"
+FEATURE_PACKAGES_ssh-server-openssh = "packagegroup-core-ssh-openssh"
+FEATURE_PACKAGES_qt4-pkgs = "packagegroup-core-qt-demoapps"
+FEATURE_PACKAGES_hwcodecs = "${MACHINE_HWCODECS}"
+
+
+# IMAGE_FEATURES_REPLACES_foo = 'bar1 bar2'
+# Including image feature foo would replace the image features bar1 and bar2
+IMAGE_FEATURES_REPLACES_ssh-server-openssh = "ssh-server-dropbear"
+
+# IMAGE_FEATURES_CONFLICTS_foo = 'bar1 bar2'
+# An error exception would be raised if both image features foo and bar1(or bar2) are included
+
+MACHINE_HWCODECS ??= ""
+
+CORE_IMAGE_BASE_INSTALL = '\
+    packagegroup-core-boot \
+    packagegroup-base-extended \
+    \
+    ${CORE_IMAGE_EXTRA_INSTALL} \
+    '
+
+CORE_IMAGE_EXTRA_INSTALL ?= ""
+
+IMAGE_INSTALL ?= "${CORE_IMAGE_BASE_INSTALL}"
+
+inherit image
+
+# Create /etc/timestamp during image construction to give a reasonably sane default time setting
+ROOTFS_POSTPROCESS_COMMAND += "rootfs_update_timestamp ; "
+
+# Zap the root password if debug-tweaks feature is not enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("IMAGE_FEATURES", "debug-tweaks", "", "zap_empty_root_password ; ",d)}'
+
+# Tweak the mount options for rootfs in /etc/fstab if read-only-rootfs is enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("IMAGE_FEATURES", "read-only-rootfs", "read_only_rootfs_hook; ", "",d)}'