diff --git a/extmod/moduhashlib.c b/extmod/moduhashlib.c
index 6389455c06..5e14fc8d43 100644
--- a/extmod/moduhashlib.c
+++ b/extmod/moduhashlib.c
@@ -29,14 +29,6 @@
 
 #include "py/runtime.h"
 
-static void check_not_unicode(const mp_obj_t arg) {
-#if MICROPY_CPYTHON_COMPAT
-    if (MP_OBJ_IS_STR(arg)) {
-        mp_raise_TypeError("a bytes-like object is required");
-    }
-#endif
-}
-
 #if MICROPY_PY_UHASHLIB
 
 #if MICROPY_PY_UHASHLIB_SHA256
@@ -102,6 +94,14 @@ STATIC mp_obj_t uhashlib_sha256_digest(mp_obj_t self_in) {
 
 #else
 
+static void check_not_unicode(const mp_obj_t arg) {
+#if MICROPY_CPYTHON_COMPAT
+    if (MP_OBJ_IS_STR(arg)) {
+        mp_raise_TypeError("a bytes-like object is required");
+    }
+#endif
+}
+
 STATIC mp_obj_t uhashlib_sha256_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
     mp_arg_check_num(n_args, n_kw, 0, 1, false);
     mp_obj_hash_t *o = m_new_obj_var(mp_obj_hash_t, char, sizeof(CRYAL_SHA256_CTX));
diff --git a/extmod/vfs_fat.h b/extmod/vfs_fat.h
index ded8bc885a..dd5e5ffcb2 100644
--- a/extmod/vfs_fat.h
+++ b/extmod/vfs_fat.h
@@ -60,15 +60,6 @@ typedef struct _pyb_file_obj_t {
     FIL fp;
 } pyb_file_obj_t;
 
-
-// These should be general types (mpy TOOD says so). In micropython, these are defined in
-// mpconfigport.h.
-////////////#define mp_type_fileio mp_type_vfs_fat_fileio
-////////////#define mp_type_textio mp_type_vfs_fat_textio
-
-////////////extern const mp_obj_type_t mp_type_fileio;
-////////////extern const mp_obj_type_t mp_type_textio;
-
 extern const byte fresult_to_errno_table[20];
 extern const mp_obj_type_t mp_fat_vfs_type;
 extern const mp_obj_type_t mp_type_vfs_fat_fileio;
diff --git a/extmod/vfs_fat_diskio.c b/extmod/vfs_fat_diskio.c
index 3b5c7d8887..0e442d8fa9 100644
--- a/extmod/vfs_fat_diskio.c
+++ b/extmod/vfs_fat_diskio.c
@@ -75,8 +75,9 @@ DRESULT disk_read (
             return RES_ERROR;
         }
     } else {
+        mp_obj_array_t ar = {{&mp_type_bytearray}, BYTEARRAY_TYPECODE, 0, count * SECSIZE(&vfs->fatfs), buff};
         vfs->readblocks[2] = MP_OBJ_NEW_SMALL_INT(sector);
-        vfs->readblocks[3] = mp_obj_new_bytearray_by_ref(count * SECSIZE(&vfs->fatfs), buff);
+        vfs->readblocks[3] = MP_OBJ_FROM_PTR(&ar);
         nlr_buf_t nlr;
         if (nlr_push(&nlr) == 0) {
             mp_obj_t ret = mp_call_method_n_kw(2, 0, vfs->readblocks);
@@ -120,8 +121,9 @@ DRESULT disk_write (
             return RES_ERROR;
         }
     } else {
+        mp_obj_array_t ar = {{&mp_type_bytearray}, BYTEARRAY_TYPECODE, 0, count * SECSIZE(&vfs->fatfs), (void*)buff};
         vfs->writeblocks[2] = MP_OBJ_NEW_SMALL_INT(sector);
-        vfs->writeblocks[3] = mp_obj_new_bytearray_by_ref(count * SECSIZE(&vfs->fatfs), (void*)buff);
+        vfs->writeblocks[3] = MP_OBJ_FROM_PTR(&ar);
         nlr_buf_t nlr;
         if (nlr_push(&nlr) == 0) {
             mp_obj_t ret = mp_call_method_n_kw(2, 0, vfs->writeblocks);
diff --git a/lib/mp-readline/readline.h b/lib/mp-readline/readline.h
index 00aa9622a8..17d4ec60ed 100644
--- a/lib/mp-readline/readline.h
+++ b/lib/mp-readline/readline.h
@@ -26,6 +26,8 @@
 #ifndef MICROPY_INCLUDED_LIB_MP_READLINE_READLINE_H
 #define MICROPY_INCLUDED_LIB_MP_READLINE_READLINE_H
 
+#include "py/misc.h"
+
 #define CHAR_CTRL_A (1)
 #define CHAR_CTRL_B (2)
 #define CHAR_CTRL_C (3)
diff --git a/ports/atmel-samd/mpconfigport.h b/ports/atmel-samd/mpconfigport.h
index 6324e7a930..49f71b2213 100644
--- a/ports/atmel-samd/mpconfigport.h
+++ b/ports/atmel-samd/mpconfigport.h
@@ -123,6 +123,9 @@ typedef long mp_off_t;
 
 #define MP_PLAT_PRINT_STRN(str, len) mp_hal_stdout_tx_strn_cooked(str, len)
 
+#define mp_type_fileio mp_type_vfs_fat_fileio
+#define mp_type_textio mp_type_vfs_fat_textio
+
 #define mp_import_stat mp_vfs_import_stat
 #define mp_builtin_open_obj mp_vfs_open_obj
 
diff --git a/ports/esp8266/common-hal/neopixel_write/__init__.c b/ports/esp8266/common-hal/neopixel_write/__init__.c
index 84a743d111..25fb0dcea5 100644
--- a/ports/esp8266/common-hal/neopixel_write/__init__.c
+++ b/ports/esp8266/common-hal/neopixel_write/__init__.c
@@ -29,5 +29,5 @@
 #include "espneopixel.h"
 
 void common_hal_neopixel_write(const digitalio_digitalinout_obj_t* digitalinout, uint8_t *pixels, uint32_t numBytes) {
-    esp_neopixel_write(digitalinout->pin->gpio_number, pixels, numBytes);
+    esp_neopixel_write(digitalinout->pin->gpio_number, pixels, numBytes, true /*800 kHz*/);
 }
diff --git a/ports/esp8266/esp_mphal.c b/ports/esp8266/esp_mphal.c
index be284c8f34..fe669265e1 100644
--- a/ports/esp8266/esp_mphal.c
+++ b/ports/esp8266/esp_mphal.c
@@ -35,18 +35,15 @@
 #include "extmod/misc.h"
 #include "lib/utils/pyexec.h"
 
-STATIC byte stdin_ringbuf_array[256];
-ringbuf_t stdin_ringbuf = {stdin_ringbuf_array, sizeof(stdin_ringbuf_array), 0, 0};
+STATIC byte input_buf_array[256];
+ringbuf_t stdin_ringbuf = {input_buf_array, sizeof(input_buf_array)};
 void mp_hal_debug_tx_strn_cooked(void *env, const char *str, uint32_t len);
 const mp_print_t mp_debug_print = {NULL, mp_hal_debug_tx_strn_cooked};
 
-int uart_attached_to_dupterm;
-
 void mp_hal_init(void) {
     //ets_wdt_disable(); // it's a pain while developing
     mp_hal_rtc_init();
     uart_init(UART_BIT_RATE_115200, UART_BIT_RATE_115200);
-    uart_attached_to_dupterm = 0;
 }
 
 void mp_hal_delay_us(uint32_t us) {
@@ -87,11 +84,19 @@ void mp_hal_debug_str(const char *str) {
 #endif
 
 void mp_hal_stdout_tx_str(const char *str) {
-    mp_uos_dupterm_tx_strn(str, strlen(str));
+    const char *last = str;
+    while (*str) {
+        uart_tx_one_char(UART0, *str++);
+    }
+    mp_uos_dupterm_tx_strn(last, str - last);
 }
 
 void mp_hal_stdout_tx_strn(const char *str, uint32_t len) {
-    mp_uos_dupterm_tx_strn(str, len);
+    const char *last = str;
+    while (len--) {
+        uart_tx_one_char(UART0, *str++);
+    }
+    mp_uos_dupterm_tx_strn(last, str - last);
 }
 
 void mp_hal_stdout_tx_strn_cooked(const char *str, uint32_t len) {
@@ -101,11 +106,13 @@ void mp_hal_stdout_tx_strn_cooked(const char *str, uint32_t len) {
             if (str > last) {
                 mp_uos_dupterm_tx_strn(last, str - last);
             }
+            uart_tx_one_char(UART0, '\r');
+            uart_tx_one_char(UART0, '\n');
             mp_uos_dupterm_tx_strn("\r\n", 2);
             ++str;
             last = str;
         } else {
-            ++str;
+            uart_tx_one_char(UART0, *str++);
         }
     }
     if (str > last) {
diff --git a/ports/esp8266/esp_mphal.h b/ports/esp8266/esp_mphal.h
index 56d9fa35fe..5ecd392a6b 100644
--- a/ports/esp8266/esp_mphal.h
+++ b/ports/esp8266/esp_mphal.h
@@ -40,9 +40,6 @@ void mp_hal_signal_input(void);
 // Call this when data is available in dupterm object
 void mp_hal_signal_dupterm_input(void);
 
-// This variable counts how many times the UART is attached to dupterm
-extern int uart_attached_to_dupterm;
-
 void mp_hal_init(void);
 void mp_hal_rtc_init(void);
 
diff --git a/ports/esp8266/uart.c b/ports/esp8266/uart.c
index 52707f9812..4a84053373 100644
--- a/ports/esp8266/uart.c
+++ b/ports/esp8266/uart.c
@@ -34,11 +34,6 @@ static int uart_os = UART_OS;
 static os_event_t uart_evt_queue[16];
 #endif
 
-// A small, static ring buffer for incoming chars
-// This will only be populated if the UART is not attached to dupterm
-static byte uart_ringbuf_array[16];
-static ringbuf_t uart_ringbuf = {uart_ringbuf_array, sizeof(uart_ringbuf_array), 0, 0};
-
 static void uart0_rx_intr_handler(void *para);
 
 void soft_reset(void);
@@ -175,26 +170,18 @@ static void uart0_rx_intr_handler(void *para) {
 
         while (READ_PERI_REG(UART_STATUS(uart_no)) & (UART_RXFIFO_CNT << UART_RXFIFO_CNT_S)) {
             uint8 RcvChar = READ_PERI_REG(UART_FIFO(uart_no)) & 0xff;
-            // For efficiency, when connected to dupterm we put incoming chars
-            // directly on stdin_ringbuf, rather than going via uart_ringbuf
-            if (uart_attached_to_dupterm) {
-                if (RcvChar == mp_interrupt_char) {
-                    mp_keyboard_interrupt();
-                } else {
-                    ringbuf_put(&stdin_ringbuf, RcvChar);
-                }
+            if (RcvChar == mp_interrupt_char) {
+                mp_keyboard_interrupt();
             } else {
-                ringbuf_put(&uart_ringbuf, RcvChar);
+                ringbuf_put(&stdin_ringbuf, RcvChar);
             }
         }
 
+        mp_hal_signal_input();
+
         // Clear pending FIFO interrupts
         WRITE_PERI_REG(UART_INT_CLR(UART_REPL), UART_RXFIFO_TOUT_INT_CLR | UART_RXFIFO_FULL_INT_ST);
         ETS_UART_INTR_ENABLE();
-
-        if (uart_attached_to_dupterm) {
-            mp_hal_signal_input();
-        }
     }
 }
 
@@ -203,7 +190,7 @@ static void uart0_rx_intr_handler(void *para) {
 bool uart_rx_wait(uint32_t timeout_us) {
     uint32_t start = system_get_time();
     for (;;) {
-        if (uart_ringbuf.iget != uart_ringbuf.iput) {
+        if (stdin_ringbuf.iget != stdin_ringbuf.iput) {
             return true; // have at least 1 char ready for reading
         }
         if (system_get_time() - start >= timeout_us) {
@@ -214,7 +201,7 @@ bool uart_rx_wait(uint32_t timeout_us) {
 }
 
 int uart_rx_any(uint8 uart) {
-    if (uart_ringbuf.iget != uart_ringbuf.iput) {
+    if (stdin_ringbuf.iget != stdin_ringbuf.iput) {
         return true; // have at least 1 char ready for reading
     }
     return false;
@@ -230,7 +217,7 @@ int uart_tx_any_room(uint8 uart) {
 
 // Returns char from the input buffer, else -1 if buffer is empty.
 int uart_rx_char(void) {
-    return ringbuf_get(&uart_ringbuf);
+    return ringbuf_get(&stdin_ringbuf);
 }
 
 int uart_rx_one_char(uint8 uart_no) {
@@ -288,7 +275,7 @@ void uart_task_handler(os_event_t *evt) {
     }
 
     int c, ret = 0;
-    while ((c = ringbuf_get(&input_buf)) >= 0) {
+    while ((c = ringbuf_get(&stdin_ringbuf)) >= 0) {
         if (c == mp_interrupt_char) {
             mp_keyboard_interrupt();
         }
diff --git a/ports/nrf/modules/ubluepy/ubluepy_scan_entry.c b/ports/nrf/modules/ubluepy/ubluepy_scan_entry.c
index 8a936d5928..773070b089 100644
--- a/ports/nrf/modules/ubluepy/ubluepy_scan_entry.c
+++ b/ports/nrf/modules/ubluepy/ubluepy_scan_entry.c
@@ -109,7 +109,7 @@ STATIC mp_obj_t scan_entry_get_scan_data(mp_obj_t self_in) {
                 vstr_t vstr;
                 vstr_init(&vstr, len);
                 vstr_printf(&vstr, "%s", text);
-                description = mp_obj_new_str(vstr.buf, vstr.len, false);
+                description = mp_obj_new_str(vstr.buf, vstr.len);
                 vstr_clear(&vstr);
             }
         }
diff --git a/ports/nrf/modules/ubluepy/ubluepy_scanner.c b/ports/nrf/modules/ubluepy/ubluepy_scanner.c
index c92b7fd876..1cde3d551e 100644
--- a/ports/nrf/modules/ubluepy/ubluepy_scanner.c
+++ b/ports/nrf/modules/ubluepy/ubluepy_scanner.c
@@ -49,7 +49,7 @@ STATIC void adv_event_handler(mp_obj_t self_in, uint16_t event_id, ble_drv_adv_d
                 data->p_peer_addr[5], data->p_peer_addr[4], data->p_peer_addr[3],
                 data->p_peer_addr[2], data->p_peer_addr[1], data->p_peer_addr[0]);
 
-    item->addr = mp_obj_new_str(vstr.buf, vstr.len, false);
+    item->addr = mp_obj_new_str(vstr.buf, vstr.len);
 
     vstr_clear(&vstr);
 
diff --git a/ports/unix/Makefile b/ports/unix/Makefile
index 1136c42b62..104ad3e5d1 100644
--- a/ports/unix/Makefile
+++ b/ports/unix/Makefile
@@ -261,6 +261,9 @@ coverage_test: coverage
 	gcov -o build-coverage/py $(TOP)/py/*.c
 	gcov -o build-coverage/extmod $(TOP)/extmod/*.c
 
+coverage_clean:
+	$(MAKE) V=2 BUILD=build-coverage PROG=micropython_coverage clean
+
 # Value of configure's --host= option (required for cross-compilation).
 # Deduce it from CROSS_COMPILE by default, but can be overridden.
 ifneq ($(CROSS_COMPILE),)
diff --git a/ports/unix/coverage.c b/ports/unix/coverage.c
index 7820f6d736..841924c58d 100644
--- a/ports/unix/coverage.c
+++ b/ports/unix/coverage.c
@@ -173,7 +173,7 @@ STATIC mp_obj_t extra_coverage(void) {
         gc_unlock();
 
         // using gc_realloc to resize to 0, which means free the memory
-        void *p = gc_alloc(4, false);
+        void *p = gc_alloc(4, false, false);
         mp_printf(&mp_plat_print, "%p\n", gc_realloc(p, 0, false));
 
         // calling gc_nbytes with a non-heap pointer
diff --git a/py/binary.c b/py/binary.c
index bb334ed3db..4f02525d76 100644
--- a/py/binary.c
+++ b/py/binary.c
@@ -148,7 +148,7 @@ mp_obj_t mp_binary_get_val_array(char typecode, void *p, mp_uint_t index) {
         #endif
 #if MICROPY_PY_BUILTINS_FLOAT
         case 'f':
-            return mp_obj_new_float((mp_float_t)((float*)p)[index]);
+            return mp_obj_new_float(((float*)p)[index]);
         case 'd':
             return mp_obj_new_float(((double*)p)[index]);
 #endif
@@ -213,7 +213,7 @@ mp_obj_t mp_binary_get_val(char struct_type, char val_type, byte **ptr) {
 #if MICROPY_NONSTANDARD_TYPECODES
     } else if (val_type == 'S') {
         const char *s_val = (const char*)(uintptr_t)(mp_uint_t)val;
-        return mp_obj_new_str(s_val, strlen(s_val), false);
+        return mp_obj_new_str(s_val, strlen(s_val));
 #endif
 #if MICROPY_PY_BUILTINS_FLOAT
     } else if (val_type == 'f') {
diff --git a/py/frozenmod.c b/py/frozenmod.c
index 5464d0af90..a9143b582a 100644
--- a/py/frozenmod.c
+++ b/py/frozenmod.c
@@ -43,8 +43,14 @@ extern const char mp_frozen_str_names[];
 extern const uint32_t mp_frozen_str_sizes[];
 extern const char mp_frozen_str_content[];
 
-// On input, *len contains size of name, on output - size of content
+// str_len is length of str. *len is set on on output to size of content
 const char *mp_find_frozen_str(const char *str, size_t str_len, size_t *len) {
+    // If the frozen module pseudo dir (e.g., ".frozen/") is a prefix of str, remove it.
+    if (strncmp(str, MP_FROZEN_FAKE_DIR_SLASH, MP_FROZEN_FAKE_DIR_SLASH_LENGTH) == 0) {
+        str = str + MP_FROZEN_FAKE_DIR_SLASH_LENGTH;
+        str_len = str_len - MP_FROZEN_FAKE_DIR_SLASH_LENGTH;
+    }
+
     const char *name = mp_frozen_str_names;
 
     size_t offset = 0;
diff --git a/py/objnamedtuple.h b/py/objnamedtuple.h
index a36404b8d4..deac7107be 100644
--- a/py/objnamedtuple.h
+++ b/py/objnamedtuple.h
@@ -39,7 +39,7 @@
 
 typedef struct _mp_obj_namedtuple_type_t {
     mp_obj_type_t base;
-    mp_uint_t n_fields;
+    size_t n_fields;
     qstr fields[];
 } mp_obj_namedtuple_type_t;
 
@@ -48,9 +48,9 @@ typedef struct _mp_obj_namedtuple_t {
 } mp_obj_namedtuple_t;
 
 void namedtuple_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind);
-
+size_t mp_obj_namedtuple_find_field(const mp_obj_namedtuple_type_t *type, qstr name);
 void namedtuple_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest);
-
+mp_obj_namedtuple_type_t *mp_obj_new_namedtuple_base(size_t n_fields, mp_obj_t *fields);
 mp_obj_t namedtuple_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args);
 
 #endif // MICROPY_PY_COLLECTIONS
diff --git a/shared-bindings/bleio/Adapter.c b/shared-bindings/bleio/Adapter.c
index 81efea54eb..bfe87071d7 100644
--- a/shared-bindings/bleio/Adapter.c
+++ b/shared-bindings/bleio/Adapter.c
@@ -86,7 +86,7 @@ STATIC mp_obj_t bleio_adapter_get_address(mp_obj_t self) {
 
     common_hal_bleio_adapter_get_address(&vstr);
 
-    const mp_obj_t mac_str = mp_obj_new_str(vstr.buf, vstr.len, false);
+    const mp_obj_t mac_str = mp_obj_new_str(vstr.buf, vstr.len);
 
     vstr_clear(&vstr);
 
diff --git a/tests/import/mpy_invalid.py.exp b/tests/import/mpy_invalid.py.exp
index 1727ea1cea..e4f2b13e99 100644
--- a/tests/import/mpy_invalid.py.exp
+++ b/tests/import/mpy_invalid.py.exp
@@ -1,3 +1,3 @@
-mod0 ValueError incompatible .mpy file
-mod1 ValueError incompatible .mpy file
-mod2 ValueError incompatible .mpy file
+mod0 ValueError Incompatible .mpy file. Please update all .mpy files. See http://adafru.it/mpy-update for more info.
+mod1 ValueError Incompatible .mpy file. Please update all .mpy files. See http://adafru.it/mpy-update for more info.
+mod2 ValueError Incompatible .mpy file. Please update all .mpy files. See http://adafru.it/mpy-update for more info.
diff --git a/tests/run-tests b/tests/run-tests
index 3064f6845a..94e1591e8a 100755
--- a/tests/run-tests
+++ b/tests/run-tests
@@ -396,7 +396,7 @@ def run_tests(pyb, tests, args, base_path=".", num_threads=1):
                 if pat.search(test_file):
                     verdict = action
             if verdict == "exclude":
-                continue
+                return
 
         test_basename = os.path.basename(test_file)
         test_name = os.path.splitext(test_basename)[0]
@@ -419,7 +419,7 @@ def run_tests(pyb, tests, args, base_path=".", num_threads=1):
         if args.list_tests:
             if not skip_it:
                 print(test_file)
-            continue
+            return
 
         if skip_it:
             print("skip ", test_file)