diff --git a/extmod/extmod.cmake b/extmod/extmod.cmake
index 67f7d8fd39..9c05237774 100644
--- a/extmod/extmod.cmake
+++ b/extmod/extmod.cmake
@@ -25,6 +25,7 @@ set(MICROPY_SOURCE_EXTMOD
     ${MICROPY_EXTMOD_DIR}/moduhashlib.c
     ${MICROPY_EXTMOD_DIR}/moduheapq.c
     ${MICROPY_EXTMOD_DIR}/modujson.c
+    ${MICROPY_EXTMOD_DIR}/moduos.c
     ${MICROPY_EXTMOD_DIR}/moduplatform.c
     ${MICROPY_EXTMOD_DIR}/modurandom.c
     ${MICROPY_EXTMOD_DIR}/modure.c
diff --git a/extmod/moduos.c b/extmod/moduos.c
new file mode 100644
index 0000000000..6dcead0fc4
--- /dev/null
+++ b/extmod/moduos.c
@@ -0,0 +1,134 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016-2022 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/objstr.h"
+#include "py/runtime.h"
+
+#if MICROPY_PY_UOS
+
+#include "extmod/misc.h"
+#include "extmod/vfs.h"
+
+#if MICROPY_VFS_FAT
+#include "extmod/vfs_fat.h"
+#endif
+
+#if MICROPY_VFS_LFS1 || MICROPY_VFS_LFS2
+#include "extmod/vfs_lfs.h"
+#endif
+
+#if MICROPY_PY_UOS_UNAME
+#include "genhdr/mpversion.h"
+#endif
+
+#ifdef MICROPY_PY_UOS_INCLUDEFILE
+#include MICROPY_PY_UOS_INCLUDEFILE
+#endif
+
+#ifdef MICROPY_BUILD_TYPE
+#define MICROPY_BUILD_TYPE_PAREN " (" MICROPY_BUILD_TYPE ")"
+#else
+#define MICROPY_BUILD_TYPE_PAREN
+#endif
+
+STATIC const qstr mp_uos_uname_info_fields[] = {
+    MP_QSTR_sysname,
+    MP_QSTR_nodename,
+    MP_QSTR_release,
+    MP_QSTR_version,
+    MP_QSTR_machine
+};
+STATIC const MP_DEFINE_STR_OBJ(mp_uos_uname_info_sysname_obj, MICROPY_PY_SYS_PLATFORM);
+STATIC const MP_DEFINE_STR_OBJ(mp_uos_uname_info_nodename_obj, MICROPY_PY_SYS_PLATFORM);
+STATIC const MP_DEFINE_STR_OBJ(mp_uos_uname_info_release_obj, MICROPY_VERSION_STRING);
+STATIC const MP_DEFINE_STR_OBJ(mp_uos_uname_info_version_obj, MICROPY_GIT_TAG " on " MICROPY_BUILD_DATE MICROPY_BUILD_TYPE_PAREN);
+STATIC const MP_DEFINE_STR_OBJ(mp_uos_uname_info_machine_obj, MICROPY_HW_BOARD_NAME " with " MICROPY_HW_MCU_NAME);
+
+STATIC MP_DEFINE_ATTRTUPLE(
+    mp_uos_uname_info_obj,
+    mp_uos_uname_info_fields,
+    5,
+    MP_ROM_PTR(&mp_uos_uname_info_sysname_obj),
+    MP_ROM_PTR(&mp_uos_uname_info_nodename_obj),
+    MP_ROM_PTR(&mp_uos_uname_info_release_obj),
+    MP_ROM_PTR(&mp_uos_uname_info_version_obj),
+    MP_ROM_PTR(&mp_uos_uname_info_machine_obj)
+    );
+
+STATIC mp_obj_t mp_uos_uname(void) {
+    return MP_OBJ_FROM_PTR(&mp_uos_uname_info_obj);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(mp_uos_uname_obj, mp_uos_uname);
+
+STATIC const mp_rom_map_elem_t os_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uos) },
+
+    { MP_ROM_QSTR(MP_QSTR_uname), MP_ROM_PTR(&mp_uos_uname_obj) },
+    #if MICROPY_PY_UOS_URANDOM
+    { MP_ROM_QSTR(MP_QSTR_urandom), MP_ROM_PTR(&mp_uos_urandom_obj) },
+    #endif
+
+    #if MICROPY_VFS
+    { MP_ROM_QSTR(MP_QSTR_chdir), MP_ROM_PTR(&mp_vfs_chdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_getcwd), MP_ROM_PTR(&mp_vfs_getcwd_obj) },
+    { MP_ROM_QSTR(MP_QSTR_listdir), MP_ROM_PTR(&mp_vfs_listdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_mkdir), MP_ROM_PTR(&mp_vfs_mkdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_remove), MP_ROM_PTR(&mp_vfs_remove_obj) },
+    { MP_ROM_QSTR(MP_QSTR_rename), MP_ROM_PTR(&mp_vfs_rename_obj) },
+    { MP_ROM_QSTR(MP_QSTR_rmdir), MP_ROM_PTR(&mp_vfs_rmdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_stat), MP_ROM_PTR(&mp_vfs_stat_obj) },
+    { MP_ROM_QSTR(MP_QSTR_statvfs), MP_ROM_PTR(&mp_vfs_statvfs_obj) },
+    #endif
+
+    // The following are MicroPython extensions.
+
+    #if MICROPY_PY_OS_DUPTERM
+    { MP_ROM_QSTR(MP_QSTR_dupterm), MP_ROM_PTR(&mp_uos_dupterm_obj) },
+    #endif
+
+    #if MICROPY_VFS
+    { MP_ROM_QSTR(MP_QSTR_ilistdir), MP_ROM_PTR(&mp_vfs_ilistdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&mp_vfs_mount_obj) },
+    { MP_ROM_QSTR(MP_QSTR_umount), MP_ROM_PTR(&mp_vfs_umount_obj) },
+    #if MICROPY_VFS_FAT
+    { MP_ROM_QSTR(MP_QSTR_VfsFat), MP_ROM_PTR(&mp_fat_vfs_type) },
+    #endif
+    #if MICROPY_VFS_LFS1
+    { MP_ROM_QSTR(MP_QSTR_VfsLfs1), MP_ROM_PTR(&mp_type_vfs_lfs1) },
+    #endif
+    #if MICROPY_VFS_LFS2
+    { MP_ROM_QSTR(MP_QSTR_VfsLfs2), MP_ROM_PTR(&mp_type_vfs_lfs2) },
+    #endif
+    #endif
+};
+STATIC MP_DEFINE_CONST_DICT(os_module_globals, os_module_globals_table);
+
+const mp_obj_module_t mp_module_uos = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&os_module_globals,
+};
+
+#endif // MICROPY_PY_UOS
diff --git a/ports/esp32/mpconfigport.h b/ports/esp32/mpconfigport.h
index d4f542f668..c820e526a2 100644
--- a/ports/esp32/mpconfigport.h
+++ b/ports/esp32/mpconfigport.h
@@ -72,6 +72,7 @@
 #define MICROPY_PY_UHASHLIB_SHA256          (1)
 #define MICROPY_PY_UCRYPTOLIB               (1)
 #define MICROPY_PY_URANDOM_SEED_INIT_FUNC   (esp_random())
+#define MICROPY_PY_UOS                      (0)
 #define MICROPY_PY_OS_DUPTERM               (1)
 #define MICROPY_PY_MACHINE                  (1)
 #define MICROPY_PY_MACHINE_PIN_MAKE_NEW     mp_pin_make_new
diff --git a/ports/rp2/CMakeLists.txt b/ports/rp2/CMakeLists.txt
index a428b0c39b..0ceb039675 100644
--- a/ports/rp2/CMakeLists.txt
+++ b/ports/rp2/CMakeLists.txt
@@ -97,7 +97,6 @@ set(MICROPY_SOURCE_PORT
     main.c
     modmachine.c
     modrp2.c
-    moduos.c
     modutime.c
     mphalport.c
     mpthreadport.c
diff --git a/ports/rp2/moduos.c b/ports/rp2/moduos.c
index a9dc30df89..6288ff5696 100644
--- a/ports/rp2/moduos.c
+++ b/ports/rp2/moduos.c
@@ -24,43 +24,11 @@
  * THE SOFTWARE.
  */
 
-#include "py/objstr.h"
 #include "py/runtime.h"
-#include "extmod/misc.h"
-#include "extmod/vfs.h"
-#include "extmod/vfs_fat.h"
-#include "extmod/vfs_lfs.h"
-#include "genhdr/mpversion.h"
 
 uint8_t rosc_random_u8(size_t cycles);
 
-STATIC const qstr os_uname_info_fields[] = {
-    MP_QSTR_sysname, MP_QSTR_nodename,
-    MP_QSTR_release, MP_QSTR_version, MP_QSTR_machine
-};
-STATIC const MP_DEFINE_STR_OBJ(os_uname_info_sysname_obj, MICROPY_PY_SYS_PLATFORM);
-STATIC const MP_DEFINE_STR_OBJ(os_uname_info_nodename_obj, MICROPY_PY_SYS_PLATFORM);
-STATIC const MP_DEFINE_STR_OBJ(os_uname_info_release_obj, MICROPY_VERSION_STRING);
-STATIC const MP_DEFINE_STR_OBJ(os_uname_info_version_obj, MICROPY_GIT_TAG " on " MICROPY_BUILD_DATE " (" MICROPY_BUILD_TYPE ")");
-STATIC const MP_DEFINE_STR_OBJ(os_uname_info_machine_obj, MICROPY_HW_BOARD_NAME " with " MICROPY_HW_MCU_NAME);
-
-STATIC MP_DEFINE_ATTRTUPLE(
-    os_uname_info_obj,
-    os_uname_info_fields,
-    5,
-    (mp_obj_t)&os_uname_info_sysname_obj,
-    (mp_obj_t)&os_uname_info_nodename_obj,
-    (mp_obj_t)&os_uname_info_release_obj,
-    (mp_obj_t)&os_uname_info_version_obj,
-    (mp_obj_t)&os_uname_info_machine_obj
-    );
-
-STATIC mp_obj_t os_uname(void) {
-    return (mp_obj_t)&os_uname_info_obj;
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(os_uname_obj, os_uname);
-
-STATIC mp_obj_t os_urandom(mp_obj_t num) {
+STATIC mp_obj_t mp_uos_urandom(mp_obj_t num) {
     mp_int_t n = mp_obj_get_int(num);
     vstr_t vstr;
     vstr_init_len(&vstr, n);
@@ -69,50 +37,4 @@ STATIC mp_obj_t os_urandom(mp_obj_t num) {
     }
     return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_urandom_obj, os_urandom);
-
-STATIC const mp_rom_map_elem_t os_module_globals_table[] = {
-    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uos) },
-
-    { MP_ROM_QSTR(MP_QSTR_uname), MP_ROM_PTR(&os_uname_obj) },
-    { MP_ROM_QSTR(MP_QSTR_urandom), MP_ROM_PTR(&os_urandom_obj) },
-
-    #if MICROPY_VFS
-    { MP_ROM_QSTR(MP_QSTR_chdir), MP_ROM_PTR(&mp_vfs_chdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_getcwd), MP_ROM_PTR(&mp_vfs_getcwd_obj) },
-    { MP_ROM_QSTR(MP_QSTR_listdir), MP_ROM_PTR(&mp_vfs_listdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_mkdir), MP_ROM_PTR(&mp_vfs_mkdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_remove), MP_ROM_PTR(&mp_vfs_remove_obj) },
-    { MP_ROM_QSTR(MP_QSTR_rename), MP_ROM_PTR(&mp_vfs_rename_obj) },
-    { MP_ROM_QSTR(MP_QSTR_rmdir), MP_ROM_PTR(&mp_vfs_rmdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_stat), MP_ROM_PTR(&mp_vfs_stat_obj) },
-    { MP_ROM_QSTR(MP_QSTR_statvfs), MP_ROM_PTR(&mp_vfs_statvfs_obj) },
-    #endif
-
-    // The following are MicroPython extensions.
-
-    #if MICROPY_PY_OS_DUPTERM
-    { MP_ROM_QSTR(MP_QSTR_dupterm), MP_ROM_PTR(&mp_uos_dupterm_obj) },
-    #endif
-
-    #if MICROPY_VFS
-    { MP_ROM_QSTR(MP_QSTR_ilistdir), MP_ROM_PTR(&mp_vfs_ilistdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&mp_vfs_mount_obj) },
-    { MP_ROM_QSTR(MP_QSTR_umount), MP_ROM_PTR(&mp_vfs_umount_obj) },
-    #if MICROPY_VFS_FAT
-    { MP_ROM_QSTR(MP_QSTR_VfsFat), MP_ROM_PTR(&mp_fat_vfs_type) },
-    #endif
-    #if MICROPY_VFS_LFS1
-    { MP_ROM_QSTR(MP_QSTR_VfsLfs1), MP_ROM_PTR(&mp_type_vfs_lfs1) },
-    #endif
-    #if MICROPY_VFS_LFS2
-    { MP_ROM_QSTR(MP_QSTR_VfsLfs2), MP_ROM_PTR(&mp_type_vfs_lfs2) },
-    #endif
-    #endif
-};
-STATIC MP_DEFINE_CONST_DICT(os_module_globals, os_module_globals_table);
-
-const mp_obj_module_t mp_module_uos = {
-    .base = { &mp_type_module },
-    .globals = (mp_obj_dict_t *)&os_module_globals,
-};
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_uos_urandom_obj, mp_uos_urandom);
diff --git a/ports/rp2/mpconfigport.h b/ports/rp2/mpconfigport.h
index 9e839766eb..5e78018ea3 100644
--- a/ports/rp2/mpconfigport.h
+++ b/ports/rp2/mpconfigport.h
@@ -83,6 +83,8 @@
 
 // Extended modules
 #define MICROPY_EPOCH_IS_1970                   (1)
+#define MICROPY_PY_UOS_INCLUDEFILE              "ports/rp2/moduos.c"
+#define MICROPY_PY_UOS_URANDOM                  (1)
 #define MICROPY_PY_URE_MATCH_GROUPS             (1)
 #define MICROPY_PY_URE_MATCH_SPAN_START_END     (1)
 #define MICROPY_PY_UTIME_MP_HAL                 (1)
@@ -138,7 +140,6 @@
 extern const struct _mp_obj_module_t mp_module_network;
 extern const struct _mp_obj_module_t mp_module_onewire;
 extern const struct _mp_obj_module_t mp_module_rp2;
-extern const struct _mp_obj_module_t mp_module_uos;
 extern const struct _mp_obj_module_t mp_module_usocket;
 extern const struct _mp_obj_module_t mp_module_utime;
 
@@ -186,7 +187,6 @@ extern const struct _mod_network_nic_type_t mod_network_nic_type_nina;
 #define MICROPY_PORT_BUILTIN_MODULES \
     { MP_OBJ_NEW_QSTR(MP_QSTR__onewire), (mp_obj_t)&mp_module_onewire }, \
     { MP_OBJ_NEW_QSTR(MP_QSTR__rp2), (mp_obj_t)&mp_module_rp2 }, \
-    { MP_ROM_QSTR(MP_QSTR_uos), MP_ROM_PTR(&mp_module_uos) }, \
     { MP_ROM_QSTR(MP_QSTR_utime), MP_ROM_PTR(&mp_module_utime) }, \
     SOCKET_BUILTIN_MODULE \
     NETWORK_BUILTIN_MODULE \
diff --git a/ports/zephyr/moduos.c b/ports/zephyr/moduos.c
index 49d5744af4..4d1eeb667e 100644
--- a/ports/zephyr/moduos.c
+++ b/ports/zephyr/moduos.c
@@ -36,7 +36,7 @@
 #include "extmod/vfs_lfs.h"
 #endif
 
-#if MICROPY_PY_UOS
+#if MICROPY_PY_UOS_ZEPHYR
 
 STATIC const mp_rom_map_elem_t uos_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uos) },
@@ -72,4 +72,4 @@ const mp_obj_module_t mp_module_uos = {
     .globals = (mp_obj_dict_t *)&uos_module_globals,
 };
 
-#endif // MICROPY_PY_UOS
+#endif // MICROPY_PY_UOS_ZEPHYR
diff --git a/ports/zephyr/mpconfigport.h b/ports/zephyr/mpconfigport.h
index b8e25faefd..fe124bace0 100644
--- a/ports/zephyr/mpconfigport.h
+++ b/ports/zephyr/mpconfigport.h
@@ -83,7 +83,7 @@
 #endif
 #define MICROPY_PY_UBINASCII        (1)
 #define MICROPY_PY_UHASHLIB         (1)
-#define MICROPY_PY_UOS              (1)
+#define MICROPY_PY_UOS_ZEPHYR       (1)
 #define MICROPY_PY_UTIME            (1)
 #define MICROPY_PY_UTIME_MP_HAL     (1)
 #define MICROPY_PY_ZEPHYR           (1)
@@ -144,7 +144,7 @@ extern const struct _mp_obj_module_t mp_module_usocket;
 extern const struct _mp_obj_module_t mp_module_zephyr;
 extern const struct _mp_obj_module_t mp_module_zsensor;
 
-#if MICROPY_PY_UOS
+#if MICROPY_PY_UOS_ZEPHYR
 #define MICROPY_PY_UOS_DEF { MP_ROM_QSTR(MP_QSTR_uos), MP_ROM_PTR(&mp_module_uos) },
 #else
 #define MICROPY_PY_UOS_DEF
diff --git a/py/builtin.h b/py/builtin.h
index 8639e978ff..162fed77cc 100644
--- a/py/builtin.h
+++ b/py/builtin.h
@@ -108,6 +108,7 @@ extern const mp_obj_module_t mp_module_uerrno;
 extern const mp_obj_module_t mp_module_uctypes;
 extern const mp_obj_module_t mp_module_uzlib;
 extern const mp_obj_module_t mp_module_ujson;
+extern const mp_obj_module_t mp_module_uos;
 extern const mp_obj_module_t mp_module_ure;
 extern const mp_obj_module_t mp_module_uheapq;
 extern const mp_obj_module_t mp_module_uhashlib;
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 5edff69dfd..8f9f0f02fb 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -1455,6 +1455,10 @@ typedef double mp_float_t;
 #define MICROPY_PY_UJSON_SEPARATORS (1)
 #endif
 
+#ifndef MICROPY_PY_UOS
+#define MICROPY_PY_UOS (MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_EXTRA_FEATURES)
+#endif
+
 #ifndef MICROPY_PY_URE
 #define MICROPY_PY_URE (MICROPY_CONFIG_ROM_LEVEL_AT_LEAST_EXTRA_FEATURES)
 #endif
diff --git a/py/objmodule.c b/py/objmodule.c
index 4b04f7ca9c..f7cd437bac 100644
--- a/py/objmodule.c
+++ b/py/objmodule.c
@@ -190,6 +190,9 @@ STATIC const mp_rom_map_elem_t mp_builtin_module_table[] = {
     #if MICROPY_PY_UJSON
     { MP_ROM_QSTR(MP_QSTR_ujson), MP_ROM_PTR(&mp_module_ujson) },
     #endif
+    #if MICROPY_PY_UOS
+    { MP_ROM_QSTR(MP_QSTR_uos), MP_ROM_PTR(&mp_module_uos) },
+    #endif
     #if MICROPY_PY_URE
     { MP_ROM_QSTR(MP_QSTR_ure), MP_ROM_PTR(&mp_module_ure) },
     #endif