diff --git a/classes/fiasco.yaml b/classes/fiasco.yaml
new file mode 100644
index 00000000..b7eb91a8
--- /dev/null
+++ b/classes/fiasco.yaml
@@ -0,0 +1,63 @@
+# Generic recipe for building fiasco.
+#
+# Use it like this in your own recipes:
+#
+# inherit: [fiasco]
+#
+# checkoutSCM:
+#     # our configuration:
+#     - scm: import
+#       url: src/l4re
+#       dir: conf
+#
+#     # fiasco:
+#     - scm: git
+#       url: ${GITHUB_MIRROR}/kernkonzept/fiasco.git
+#       dir: fiasco
+#
+# buildScript: |
+#     fiascoBuild $1/fiasco \
+#         $1/conf/defconfig_fiasco
+#
+# packageScript: |
+#     fiascoInstall $1
+
+inherit: [pkg-config, make]
+
+buildTools: [host-toolchain, target-toolchain, m4, flex, bison]
+buildVars: [CC, CXX, LD, CROSS_COMPILE]
+buildSetup: |
+    # $1: source dir
+    # $2: defconfig
+    fiascoBuild()
+    {
+        # If this is the first run, create the build directory. However, delete
+        # the default config, so it is updated below.
+        test -e build || (make -C "$1" BUILDDIR=$PWD/build && rm $PWD/build/globalconfig.out)
+
+        # Is the defconfig a default config?
+        DEF_CFG=$2
+        if [[ -f "$1/src/templates/globalconfig.out.$2" ]] ; then
+            DEF_CFG="$1/src/templates/globalconfig.out.$2"
+        fi
+        # check if the defconfig file exists
+        if [[ ! -f "$DEF_CFG" ]]; then
+            >&2 echo "Don't know how to use $DEF_CFG as kernel config!"
+            false
+        fi
+        # check if the source file is newer than .config
+        if [[ ! -f build/globalconfig.out || $DEF_CFG -nt build/globalconfig.out ]]; then
+            # redo the .config file
+            cp -u "$DEF_CFG" build/globalconfig.out
+            makeParallel -C $PWD/build olddefconfig
+        fi
+
+        makeParallel -C $PWD/build
+    }
+
+packageSetup: |
+    # $1: build dir
+    fiascoInstall()
+    {
+        cp -L "$1/build/fiasco" .
+    }
diff --git a/classes/fiasco/menuconfig.yaml b/classes/fiasco/menuconfig.yaml
new file mode 100644
index 00000000..e323c723
--- /dev/null
+++ b/classes/fiasco/menuconfig.yaml
@@ -0,0 +1,33 @@
+inherit: [fiasco]
+
+depends:
+    - tools:
+          target-toolchain: host-compat-toolchain
+      depends:
+          - libs::ncurses-dev
+
+buildSetup: |
+    # Calls the fiasco savedefconfig target
+    #
+    # Especially in the sandbox this can be tricky. Provide some convenience method.
+    fiascoSavedefconfig()
+    {
+        makeParallel \
+            HOSTCC="gcc" \
+            savedefconfig
+    }
+
+    # Calls the fiasco menuconfig target
+    #
+    # Especially in the sandbox this can be tricky. Provide some convenience method.
+    fiascoMenuconfig()
+    {
+        NCDEP=${BOB_DEP_PATHS[libs::ncurses-dev]}/usr
+        makeParallel \
+            HOSTCC="gcc" \
+            HOSTCFLAGS="-I${NCDEP}/include -DCURSES_LOC=\"<ncurses.h>\" -DLOCALE $(pkg-config --cflags ncurses)" \
+            HOSTLDLIBS="-L${NCDEP}/lib $(pkg-config --libs ncurses)" \
+            menuconfig
+        #  Always save a defconfig
+        fiascoSavedefconfig
+    }
diff --git a/classes/l4re.yaml b/classes/l4re.yaml
new file mode 100644
index 00000000..884ccb25
--- /dev/null
+++ b/classes/l4re.yaml
@@ -0,0 +1,105 @@
+# Generic recipe for building l4re.
+#
+# Use it like this in your own recipes:
+#
+# inherit: [l4re]
+#
+# depends:
+#     # add additional dependencies here, like linux kernels or external
+#     # device trees
+#     - fiasco
+#
+# checkoutSCM:
+#     # our configuration:
+#     - scm: import
+#       url: src/l4re
+#       dir: conf
+#
+#     # l4re repositories we want to use
+#     - scm: git
+#       url: ${GITHUB_MIRROR}/kernkonzept/mk.git
+#       dir: l4re
+#     - scm: git
+#       url: ${GITHUB_MIRROR}/kernkonzept/bootstrap.git
+#       dir: l4re/pkg/bootstrap
+#     - ...
+#
+# buildSetup: |
+#     # Add additional paths to dependencies here:
+#     export MODULE_SEARCH_PATH+=:$1/conf
+# buildScript: |
+#        l4reBuild $1/l4re \
+#           $1/conf/defconfig_l4re \
+#           pkg/bootstrap pkg/... ...
+#
+#        l4reBuildImage $1/l4re \
+#           uimage \
+#           demo \
+#           $1/conf/modules.list
+#
+# packageScript: |
+#        l4reInstall $1 \
+#           bootstrap.uimage
+
+inherit: [pkg-config, make]
+
+depends:
+    - tools:
+          target-toolchain: host-compat-toolchain
+      depends:
+          - name: devel::dtc
+            use: [tools]
+          - name: bsp::uboot-tools
+            use: [tools]
+
+buildTools: [host-toolchain, target-toolchain, m4, flex, bison, dtc, uboot-tools]
+buildVars: [CROSS_COMPILE]
+buildSetup: |
+    # Add all dependencies to the l4re module search path
+    MODULE_SEARCH_PATH=""
+    for i in "$@" ; do
+        MODULE_SEARCH_PATH+=":$i"
+    done
+    export MODULE_SEARCH_PATH
+
+    # $1: source dir
+    # $2: defconfig
+    # $3: targets (optional)
+    l4reBuild()
+    {
+        if [[ ! -e build/.bob-init-done ]] ; then
+            rm -rf $BOB_CWD/build
+            make -C $1 B=$BOB_CWD/build \
+                DEFCONFIG="$2"
+            make -C $1 O=$BOB_CWD/build \
+                olddefconfig
+            touch build/.bob-init-done
+        fi
+
+        makeParallel -C $1 O=$BOB_CWD/build \
+            ${3:-}
+    }
+
+    # $1: source dir
+    # $2: image type
+    # $3: modules entry
+    # $4: modules list
+    l4reBuildImage()
+    {
+        # we may want to replace this with l4image in a separate step
+        makeParallel -C $1 O=$BOB_CWD/build \
+            "$2" \
+            E="$3" \
+            MODULES_LIST="$4" \
+            MODULE_SEARCH_PATH="$MODULE_SEARCH_PATH"
+    }
+
+packageSetup: |
+    # $1: build dir
+    # $2+: image name(s)
+    l4reInstall()
+    {
+        for i in ${@:2}; do
+            cp -L "$1/build/images/$i" .
+        done
+    }
diff --git a/classes/l4re/menuconfig.yaml b/classes/l4re/menuconfig.yaml
new file mode 100644
index 00000000..227a3dc2
--- /dev/null
+++ b/classes/l4re/menuconfig.yaml
@@ -0,0 +1,33 @@
+inherit: [l4re]
+
+depends:
+    - tools:
+          target-toolchain: host-compat-toolchain
+      depends:
+          - libs::ncurses-dev
+
+buildSetup: |
+    # Calls the L4Re savedefconfig target
+    #
+    # Especially in the sandbox this can be tricky. Provide some convenience method.
+    l4reSavedefconfig()
+    {
+        makeParallel \
+            HOSTCC="gcc" \
+            savedefconfig
+    }
+
+    # Calls the L4Re menuconfig target
+    #
+    # Especially in the sandbox this can be tricky. Provide some convenience method.
+    l4reMenuconfig()
+    {
+        NCDEP=${BOB_DEP_PATHS[libs::ncurses-dev]}/usr
+        makeParallel \
+            HOSTCC="gcc" \
+            HOSTCFLAGS="-I${NCDEP}/include -DCURSES_LOC=\"<ncurses.h>\" -DLOCALE $(pkg-config --cflags ncurses)" \
+            HOSTLDLIBS="-L${NCDEP}/lib $(pkg-config --libs ncurses)" \
+            menuconfig
+        #  Always save a defconfig
+        l4reSavedefconfig
+    }