diff --git a/extmod/extmod.cmake b/extmod/extmod.cmake
new file mode 100644
index 0000000000..6668a2d8aa
--- /dev/null
+++ b/extmod/extmod.cmake
@@ -0,0 +1,44 @@
+# CMake fragment for MicroPython extmod component
+
+set(MICROPY_EXTMOD_DIR "${MICROPY_DIR}/extmod")
+set(MICROPY_OOFATFS_DIR "${MICROPY_DIR}/lib/oofatfs")
+
+set(MICROPY_SOURCE_EXTMOD
+    ${MICROPY_EXTMOD_DIR}/machine_i2c.c
+    ${MICROPY_EXTMOD_DIR}/machine_mem.c
+    ${MICROPY_EXTMOD_DIR}/machine_pulse.c
+    ${MICROPY_EXTMOD_DIR}/machine_signal.c
+    ${MICROPY_EXTMOD_DIR}/machine_spi.c
+    ${MICROPY_EXTMOD_DIR}/modbluetooth.c
+    ${MICROPY_EXTMOD_DIR}/modbtree.c
+    ${MICROPY_EXTMOD_DIR}/modframebuf.c
+    ${MICROPY_EXTMOD_DIR}/moduasyncio.c
+    ${MICROPY_EXTMOD_DIR}/modubinascii.c
+    ${MICROPY_EXTMOD_DIR}/moducryptolib.c
+    ${MICROPY_EXTMOD_DIR}/moductypes.c
+    ${MICROPY_EXTMOD_DIR}/moduhashlib.c
+    ${MICROPY_EXTMOD_DIR}/moduheapq.c
+    ${MICROPY_EXTMOD_DIR}/modujson.c
+    ${MICROPY_EXTMOD_DIR}/modurandom.c
+    ${MICROPY_EXTMOD_DIR}/modure.c
+    ${MICROPY_EXTMOD_DIR}/moduselect.c
+    ${MICROPY_EXTMOD_DIR}/modussl_axtls.c
+    ${MICROPY_EXTMOD_DIR}/modussl_mbedtls.c
+    ${MICROPY_EXTMOD_DIR}/modutimeq.c
+    ${MICROPY_EXTMOD_DIR}/moduwebsocket.c
+    ${MICROPY_EXTMOD_DIR}/moduzlib.c
+    ${MICROPY_EXTMOD_DIR}/modwebrepl.c
+    ${MICROPY_EXTMOD_DIR}/uos_dupterm.c
+    ${MICROPY_EXTMOD_DIR}/utime_mphal.c
+    ${MICROPY_EXTMOD_DIR}/vfs.c
+    ${MICROPY_EXTMOD_DIR}/vfs_blockdev.c
+    ${MICROPY_EXTMOD_DIR}/vfs_fat.c
+    ${MICROPY_EXTMOD_DIR}/vfs_fat_diskio.c
+    ${MICROPY_EXTMOD_DIR}/vfs_fat_file.c
+    ${MICROPY_EXTMOD_DIR}/vfs_lfs.c
+    ${MICROPY_EXTMOD_DIR}/vfs_posix.c
+    ${MICROPY_EXTMOD_DIR}/vfs_posix_file.c
+    ${MICROPY_EXTMOD_DIR}/vfs_reader.c
+    ${MICROPY_EXTMOD_DIR}/virtpin.c
+    ${MICROPY_EXTMOD_DIR}/nimble/modbluetooth_nimble.c
+)
diff --git a/py/mkrules.cmake b/py/mkrules.cmake
new file mode 100644
index 0000000000..bdff385815
--- /dev/null
+++ b/py/mkrules.cmake
@@ -0,0 +1,128 @@
+# CMake fragment for MicroPython rules
+
+set(MICROPY_PY_QSTRDEFS "${MICROPY_PY_DIR}/qstrdefs.h")
+set(MICROPY_GENHDR_DIR "${CMAKE_BINARY_DIR}/genhdr")
+set(MICROPY_MPVERSION "${MICROPY_GENHDR_DIR}/mpversion.h")
+set(MICROPY_MODULEDEFS "${MICROPY_GENHDR_DIR}/moduledefs.h")
+set(MICROPY_QSTR_DEFS_LAST "${MICROPY_GENHDR_DIR}/qstr.i.last")
+set(MICROPY_QSTR_DEFS_SPLIT "${MICROPY_GENHDR_DIR}/qstr.split")
+set(MICROPY_QSTR_DEFS_COLLECTED "${MICROPY_GENHDR_DIR}/qstrdefs.collected.h")
+set(MICROPY_QSTR_DEFS_PREPROCESSED "${MICROPY_GENHDR_DIR}/qstrdefs.preprocessed.h")
+set(MICROPY_QSTR_DEFS_GENERATED "${MICROPY_GENHDR_DIR}/qstrdefs.generated.h")
+
+# Provide defaults for preprocessor flags if not already defined
+if(NOT MICROPY_CPP_FLAGS)
+    get_target_property(MICROPY_CPP_INC ${MICROPY_TARGET} INCLUDE_DIRECTORIES)
+    get_target_property(MICROPY_CPP_DEF ${MICROPY_TARGET} COMPILE_DEFINITIONS)
+endif()
+
+# Compute MICROPY_CPP_FLAGS for preprocessor
+list(APPEND MICROPY_CPP_INC ${MICROPY_CPP_INC_EXTRA})
+list(APPEND MICROPY_CPP_DEF ${MICROPY_CPP_DEF_EXTRA})
+set(_prefix "-I")
+foreach(_arg ${MICROPY_CPP_INC})
+    list(APPEND MICROPY_CPP_FLAGS ${_prefix}${_arg})
+endforeach()
+set(_prefix "-D")
+foreach(_arg ${MICROPY_CPP_DEF})
+    list(APPEND MICROPY_CPP_FLAGS ${_prefix}${_arg})
+endforeach()
+list(APPEND MICROPY_CPP_FLAGS ${MICROPY_CPP_FLAGS_EXTRA})
+
+find_package(Python3 REQUIRED COMPONENTS Interpreter)
+
+target_sources(${MICROPY_TARGET} PRIVATE
+    ${MICROPY_MPVERSION}
+    ${MICROPY_QSTR_DEFS_GENERATED}
+)
+
+# Command to force the build of another command
+
+add_custom_command(
+    OUTPUT MICROPY_FORCE_BUILD
+    COMMENT ""
+    COMMAND echo -n
+)
+
+# Generate mpversion.h
+
+add_custom_command(
+    OUTPUT ${MICROPY_MPVERSION}
+    COMMAND ${CMAKE_COMMAND} -E make_directory ${MICROPY_GENHDR_DIR}
+    COMMAND ${Python3_EXECUTABLE} ${MICROPY_DIR}/py/makeversionhdr.py ${MICROPY_MPVERSION}
+    DEPENDS MICROPY_FORCE_BUILD
+)
+
+# Generate moduledefs.h
+
+add_custom_command(
+    OUTPUT ${MICROPY_MODULEDEFS}
+    COMMAND ${Python3_EXECUTABLE} ${MICROPY_PY_DIR}/makemoduledefs.py --vpath="/" ${MICROPY_SOURCE_QSTR} > ${MICROPY_MODULEDEFS}
+    DEPENDS ${MICROPY_MPVERSION}
+        ${MICROPY_SOURCE_QSTR}
+)
+
+# Generate qstrs
+
+# If any of the dependencies in this rule change then the C-preprocessor step must be run.
+# It only needs to be passed the list of MICROPY_SOURCE_QSTR files that have changed since
+# it was last run, but it looks like it's not possible to specify that with cmake.
+add_custom_command(
+    OUTPUT ${MICROPY_QSTR_DEFS_LAST}
+    COMMAND ${Python3_EXECUTABLE} ${MICROPY_PY_DIR}/makeqstrdefs.py pp ${CMAKE_C_COMPILER} -E output ${MICROPY_GENHDR_DIR}/qstr.i.last cflags ${MICROPY_CPP_FLAGS} -DNO_QSTR sources ${MICROPY_SOURCE_QSTR}
+    DEPENDS ${MICROPY_MODULEDEFS}
+        ${MICROPY_SOURCE_QSTR}
+    VERBATIM
+)
+
+add_custom_command(
+    OUTPUT ${MICROPY_QSTR_DEFS_SPLIT}
+    COMMAND ${Python3_EXECUTABLE} ${MICROPY_PY_DIR}/makeqstrdefs.py split qstr ${MICROPY_GENHDR_DIR}/qstr.i.last ${MICROPY_GENHDR_DIR}/qstr _
+    COMMAND touch ${MICROPY_QSTR_DEFS_SPLIT}
+    DEPENDS ${MICROPY_QSTR_DEFS_LAST}
+    VERBATIM
+)
+
+add_custom_command(
+    OUTPUT ${MICROPY_QSTR_DEFS_COLLECTED}
+    COMMAND ${Python3_EXECUTABLE} ${MICROPY_PY_DIR}/makeqstrdefs.py cat qstr _ ${MICROPY_GENHDR_DIR}/qstr ${MICROPY_QSTR_DEFS_COLLECTED}
+    DEPENDS ${MICROPY_QSTR_DEFS_SPLIT}
+    VERBATIM
+)
+
+add_custom_command(
+    OUTPUT ${MICROPY_QSTR_DEFS_PREPROCESSED}
+    COMMAND cat ${MICROPY_PY_QSTRDEFS} ${MICROPY_QSTR_DEFS_COLLECTED} | sed "s/^Q(.*)/\"&\"/" | ${CMAKE_C_COMPILER} -E ${MICROPY_CPP_FLAGS} - | sed "s/^\\\"\\(Q(.*)\\)\\\"/\\1/" > ${MICROPY_QSTR_DEFS_PREPROCESSED}
+    DEPENDS ${MICROPY_QSTR_DEFS_COLLECTED}
+    VERBATIM
+)
+
+add_custom_command(
+    OUTPUT ${MICROPY_QSTR_DEFS_GENERATED}
+    COMMAND ${Python3_EXECUTABLE} ${MICROPY_PY_DIR}/makeqstrdata.py ${MICROPY_QSTR_DEFS_PREPROCESSED} > ${MICROPY_QSTR_DEFS_GENERATED}
+    DEPENDS ${MICROPY_QSTR_DEFS_PREPROCESSED}
+    VERBATIM
+)
+
+# Build frozen code if enabled
+
+if(MICROPY_FROZEN_MANIFEST)
+    set(MICROPY_FROZEN_CONTENT "${CMAKE_BINARY_DIR}/frozen_content.c")
+
+    target_sources(${MICROPY_TARGET} PRIVATE
+        ${MICROPY_FROZEN_CONTENT}
+    )
+
+    target_compile_definitions(${MICROPY_TARGET} PUBLIC
+        MICROPY_QSTR_EXTRA_POOL=mp_qstr_frozen_const_pool
+        MICROPY_MODULE_FROZEN_MPY=\(1\)
+    )
+
+    add_custom_command(
+        OUTPUT ${MICROPY_FROZEN_CONTENT}
+        COMMAND ${Python3_EXECUTABLE} ${MICROPY_DIR}/tools/makemanifest.py -o ${MICROPY_FROZEN_CONTENT} -v "MPY_DIR=${MICROPY_DIR}" -v "PORT_DIR=${MICROPY_PORT_DIR}" -b "${CMAKE_BINARY_DIR}" -f${MICROPY_CROSS_FLAGS} ${MICROPY_FROZEN_MANIFEST}
+        DEPENDS MICROPY_FORCE_BUILD
+            ${MICROPY_QSTR_DEFS_GENERATED}
+        VERBATIM
+    )
+endif()
diff --git a/py/py.cmake b/py/py.cmake
new file mode 100644
index 0000000000..52baaa8efc
--- /dev/null
+++ b/py/py.cmake
@@ -0,0 +1,124 @@
+# CMake fragment for MicroPython core py component
+
+set(MICROPY_PY_DIR "${MICROPY_DIR}/py")
+
+# All py/ source files
+set(MICROPY_SOURCE_PY
+    ${MICROPY_PY_DIR}/argcheck.c
+    ${MICROPY_PY_DIR}/asmarm.c
+    ${MICROPY_PY_DIR}/asmbase.c
+    ${MICROPY_PY_DIR}/asmthumb.c
+    ${MICROPY_PY_DIR}/asmx64.c
+    ${MICROPY_PY_DIR}/asmx86.c
+    ${MICROPY_PY_DIR}/asmxtensa.c
+    ${MICROPY_PY_DIR}/bc.c
+    ${MICROPY_PY_DIR}/binary.c
+    ${MICROPY_PY_DIR}/builtinevex.c
+    ${MICROPY_PY_DIR}/builtinhelp.c
+    ${MICROPY_PY_DIR}/builtinimport.c
+    ${MICROPY_PY_DIR}/compile.c
+    ${MICROPY_PY_DIR}/emitbc.c
+    ${MICROPY_PY_DIR}/emitcommon.c
+    ${MICROPY_PY_DIR}/emitglue.c
+    ${MICROPY_PY_DIR}/emitinlinethumb.c
+    ${MICROPY_PY_DIR}/emitinlinextensa.c
+    ${MICROPY_PY_DIR}/emitnarm.c
+    ${MICROPY_PY_DIR}/emitnthumb.c
+    ${MICROPY_PY_DIR}/emitnx64.c
+    ${MICROPY_PY_DIR}/emitnx86.c
+    ${MICROPY_PY_DIR}/emitnxtensa.c
+    ${MICROPY_PY_DIR}/emitnxtensawin.c
+    ${MICROPY_PY_DIR}/formatfloat.c
+    ${MICROPY_PY_DIR}/frozenmod.c
+    ${MICROPY_PY_DIR}/gc.c
+    ${MICROPY_PY_DIR}/lexer.c
+    ${MICROPY_PY_DIR}/malloc.c
+    ${MICROPY_PY_DIR}/map.c
+    ${MICROPY_PY_DIR}/modarray.c
+    ${MICROPY_PY_DIR}/modbuiltins.c
+    ${MICROPY_PY_DIR}/modcmath.c
+    ${MICROPY_PY_DIR}/modcollections.c
+    ${MICROPY_PY_DIR}/modgc.c
+    ${MICROPY_PY_DIR}/modio.c
+    ${MICROPY_PY_DIR}/modmath.c
+    ${MICROPY_PY_DIR}/modmicropython.c
+    ${MICROPY_PY_DIR}/modstruct.c
+    ${MICROPY_PY_DIR}/modsys.c
+    ${MICROPY_PY_DIR}/modthread.c
+    ${MICROPY_PY_DIR}/moduerrno.c
+    ${MICROPY_PY_DIR}/mpprint.c
+    ${MICROPY_PY_DIR}/mpstate.c
+    ${MICROPY_PY_DIR}/mpz.c
+    ${MICROPY_PY_DIR}/nativeglue.c
+    ${MICROPY_PY_DIR}/nlr.c
+    ${MICROPY_PY_DIR}/nlrpowerpc.c
+    ${MICROPY_PY_DIR}/nlrsetjmp.c
+    ${MICROPY_PY_DIR}/nlrthumb.c
+    ${MICROPY_PY_DIR}/nlrx64.c
+    ${MICROPY_PY_DIR}/nlrx86.c
+    ${MICROPY_PY_DIR}/nlrxtensa.c
+    ${MICROPY_PY_DIR}/obj.c
+    ${MICROPY_PY_DIR}/objarray.c
+    ${MICROPY_PY_DIR}/objattrtuple.c
+    ${MICROPY_PY_DIR}/objbool.c
+    ${MICROPY_PY_DIR}/objboundmeth.c
+    ${MICROPY_PY_DIR}/objcell.c
+    ${MICROPY_PY_DIR}/objclosure.c
+    ${MICROPY_PY_DIR}/objcomplex.c
+    ${MICROPY_PY_DIR}/objdeque.c
+    ${MICROPY_PY_DIR}/objdict.c
+    ${MICROPY_PY_DIR}/objenumerate.c
+    ${MICROPY_PY_DIR}/objexcept.c
+    ${MICROPY_PY_DIR}/objfilter.c
+    ${MICROPY_PY_DIR}/objfloat.c
+    ${MICROPY_PY_DIR}/objfun.c
+    ${MICROPY_PY_DIR}/objgenerator.c
+    ${MICROPY_PY_DIR}/objgetitemiter.c
+    ${MICROPY_PY_DIR}/objint.c
+    ${MICROPY_PY_DIR}/objint_longlong.c
+    ${MICROPY_PY_DIR}/objint_mpz.c
+    ${MICROPY_PY_DIR}/objlist.c
+    ${MICROPY_PY_DIR}/objmap.c
+    ${MICROPY_PY_DIR}/objmodule.c
+    ${MICROPY_PY_DIR}/objnamedtuple.c
+    ${MICROPY_PY_DIR}/objnone.c
+    ${MICROPY_PY_DIR}/objobject.c
+    ${MICROPY_PY_DIR}/objpolyiter.c
+    ${MICROPY_PY_DIR}/objproperty.c
+    ${MICROPY_PY_DIR}/objrange.c
+    ${MICROPY_PY_DIR}/objreversed.c
+    ${MICROPY_PY_DIR}/objset.c
+    ${MICROPY_PY_DIR}/objsingleton.c
+    ${MICROPY_PY_DIR}/objslice.c
+    ${MICROPY_PY_DIR}/objstr.c
+    ${MICROPY_PY_DIR}/objstringio.c
+    ${MICROPY_PY_DIR}/objstrunicode.c
+    ${MICROPY_PY_DIR}/objtuple.c
+    ${MICROPY_PY_DIR}/objtype.c
+    ${MICROPY_PY_DIR}/objzip.c
+    ${MICROPY_PY_DIR}/opmethods.c
+    ${MICROPY_PY_DIR}/pairheap.c
+    ${MICROPY_PY_DIR}/parse.c
+    ${MICROPY_PY_DIR}/parsenum.c
+    ${MICROPY_PY_DIR}/parsenumbase.c
+    ${MICROPY_PY_DIR}/persistentcode.c
+    ${MICROPY_PY_DIR}/profile.c
+    ${MICROPY_PY_DIR}/pystack.c
+    ${MICROPY_PY_DIR}/qstr.c
+    ${MICROPY_PY_DIR}/reader.c
+    ${MICROPY_PY_DIR}/repl.c
+    ${MICROPY_PY_DIR}/ringbuf.c
+    ${MICROPY_PY_DIR}/runtime.c
+    ${MICROPY_PY_DIR}/runtime_utils.c
+    ${MICROPY_PY_DIR}/scheduler.c
+    ${MICROPY_PY_DIR}/scope.c
+    ${MICROPY_PY_DIR}/sequence.c
+    ${MICROPY_PY_DIR}/showbc.c
+    ${MICROPY_PY_DIR}/smallint.c
+    ${MICROPY_PY_DIR}/stackctrl.c
+    ${MICROPY_PY_DIR}/stream.c
+    ${MICROPY_PY_DIR}/unicode.c
+    ${MICROPY_PY_DIR}/vm.c
+    ${MICROPY_PY_DIR}/vstr.c
+    ${MICROPY_PY_DIR}/warning.c
+)