diff --git a/ports/atmel-samd/Makefile b/ports/atmel-samd/Makefile
index 8a5c3309f4..d0ab65e6b7 100644
--- a/ports/atmel-samd/Makefile
+++ b/ports/atmel-samd/Makefile
@@ -134,7 +134,7 @@ else
   endif
 endif
 
-CFLAGS += $(INC) -Wall -Werror -std=gnu11 -nostdlib $(BASE_CFLAGS) $(CFLAGS_MOD) $(COPT)
+CFLAGS += $(INC) -Wall -Werror -std=gnu11 -nostdlib -fshort-enums $(BASE_CFLAGS) $(CFLAGS_MOD) $(COPT)
 
 ifeq ($(CHIP_FAMILY), samd21)
 CFLAGS += \
@@ -157,7 +157,7 @@ endif
 
 
 
-LDFLAGS = $(CFLAGS) -nostartfiles -fshort-enums -Wl,-nostdlib -Wl,-T,$(GENERATED_LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
+LDFLAGS = $(CFLAGS) -nostartfiles -Wl,-nostdlib -Wl,-T,$(GENERATED_LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
 LIBS := -lgcc -lc
 
 # Use toolchain libm if we're not using our own.
diff --git a/ports/esp32s2/Makefile b/ports/esp32s2/Makefile
index 1104c5289f..5ad5c2f1d3 100644
--- a/ports/esp32s2/Makefile
+++ b/ports/esp32s2/Makefile
@@ -110,7 +110,7 @@ endif
 
 CFLAGS += $(INC) -Werror -Wall -mlongcalls -std=gnu11 -Wl,--gc-sections $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT)
 
-LDFLAGS = $(CFLAGS) -fshort-enums -Wl,-nostdlib  -Wl,-Map=$@.map -Wl,-cref
+LDFLAGS = $(CFLAGS) -Wl,-nostdlib  -Wl,-Map=$@.map -Wl,-cref
 LDFLAGS += -L$(BUILD)/esp-idf/esp-idf/esp32s2 \
            -Tesp32s2_out.ld \
            -L$(BUILD)/esp-idf/esp-idf/esp32s2/ld \
diff --git a/ports/esp32s2/mpconfigport.h b/ports/esp32s2/mpconfigport.h
index c307d47916..d340bb4805 100644
--- a/ports/esp32s2/mpconfigport.h
+++ b/ports/esp32s2/mpconfigport.h
@@ -32,6 +32,7 @@
 #define MICROPY_NLR_THUMB                   (0)
 
 #define MICROPY_PY_UJSON            (0)
+#define MICROPY_USE_INTERNAL_PRINTF      (0)
 
 #include "py/circuitpy_mpconfig.h"
 
diff --git a/ports/esp32s2/sdkconfig.defaults b/ports/esp32s2/sdkconfig.defaults
index f7deb53fb0..958e1852ea 100644
--- a/ports/esp32s2/sdkconfig.defaults
+++ b/ports/esp32s2/sdkconfig.defaults
@@ -259,7 +259,7 @@ CONFIG_ESP32S2_RTC_CLK_CAL_CYCLES=576
 CONFIG_ESP_ERR_TO_NAME_LOOKUP=y
 CONFIG_ESP_SYSTEM_EVENT_QUEUE_SIZE=32
 CONFIG_ESP_SYSTEM_EVENT_TASK_STACK_SIZE=2304
-CONFIG_ESP_MAIN_TASK_STACK_SIZE=3584
+CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192
 CONFIG_ESP_IPC_TASK_STACK_SIZE=1024
 CONFIG_ESP_MINIMAL_SHARED_STACK_SIZE=2048
 CONFIG_ESP_CONSOLE_UART_DEFAULT=y
diff --git a/ports/esp32s2/supervisor/internal_flash.c b/ports/esp32s2/supervisor/internal_flash.c
index aab7e587ae..ef216c4b1b 100644
--- a/ports/esp32s2/supervisor/internal_flash.c
+++ b/ports/esp32s2/supervisor/internal_flash.c
@@ -100,18 +100,20 @@ mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t lba, uint32
             _cache_lba = sector_offset;
         }
         for (uint8_t b = block_offset; b < blocks_per_sector; b++) {
+            // Stop copying after the last block.
+            if (block >= num_blocks) {
+              break;
+            }
             memcpy(_cache + b * FILESYSTEM_BLOCK_SIZE,
                    src + block * FILESYSTEM_BLOCK_SIZE,
                    FILESYSTEM_BLOCK_SIZE);
             block++;
         }
         result = esp_partition_erase_range(_partition, sector_offset, SECTOR_SIZE);
-        ESP_EARLY_LOGW(TAG, "erase %d", result);
         result = esp_partition_write(_partition,
                                      sector_offset,
                                      _cache,
                                      SECTOR_SIZE);
-        ESP_EARLY_LOGW(TAG, "write %d", result);
     }
 
     return 0; // success
diff --git a/ports/esp32s2/supervisor/port.c b/ports/esp32s2/supervisor/port.c
index 9e83e5778c..4c42f11af9 100644
--- a/ports/esp32s2/supervisor/port.c
+++ b/ports/esp32s2/supervisor/port.c
@@ -152,6 +152,9 @@ void port_sleep_until_interrupt(void) {
     // FreeRTOS delay here maybe.
     // Light sleep shuts down BLE and wifi.
     // esp_light_sleep_start()
+    if (sleep_time_duration == 0) {
+        return;
+    }
     vTaskDelayUntil(&sleep_time_set, sleep_time_duration);
 }
 
diff --git a/ports/litex/Makefile b/ports/litex/Makefile
index 596eaf2bb3..d75a4da288 100644
--- a/ports/litex/Makefile
+++ b/ports/litex/Makefile
@@ -83,14 +83,14 @@ else
   ### CFLAGS += -flto
 endif
 
-CFLAGS += $(INC) -Werror -Wall -std=gnu11 -nostdlib $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT)
+CFLAGS += $(INC) -Werror -Wall -std=gnu11 -nostdlib -fshort-enums $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT)
 
 # TODO: check this
 CFLAGS += -D__START=main -DFOMU
 
 LD_FILE := boards/$(BOARD)/$(BOARD)-spi.ld
 
-LDFLAGS = $(CFLAGS) -fshort-enums -Wl,-nostdlib -Wl,-T,$(LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs -Wl,-melf32lriscv
+LDFLAGS = $(CFLAGS) -Wl,-nostdlib -Wl,-T,$(LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs -Wl,-melf32lriscv
 LIBS := -lgcc -lc
 
 
diff --git a/ports/mimxrt10xx/Makefile b/ports/mimxrt10xx/Makefile
index 922978ac2e..78cab0188e 100644
--- a/ports/mimxrt10xx/Makefile
+++ b/ports/mimxrt10xx/Makefile
@@ -90,7 +90,7 @@ else
   #CFLAGS += -flto -flto-partition=none
 endif
 
-CFLAGS += $(INC) -ggdb -Wall -Wno-cast-align -std=gnu11 -nostdlib $(BASE_CFLAGS) $(CFLAGS_MOD) $(COPT)
+CFLAGS += $(INC) -ggdb -Wall -Wno-cast-align -std=gnu11 -nostdlib -fshort-enums $(BASE_CFLAGS) $(CFLAGS_MOD) $(COPT)
 
 # TODO: add these when -Werror is applied
 # Disable some warnings, as do most ports. NXP SDK causes undef, tinyusb causes cast-align
@@ -112,7 +112,7 @@ LD_FILES = $(wildcard boards/$(BOARD)/*.ld) $(addprefix linking/, flash/$(FLASH)
 
 LD_SCRIPT_FLAG := -Wl,-T,
 
-LDFLAGS = $(CFLAGS) -nostartfiles -fshort-enums -Wl,-nostdlib $(addprefix $(LD_SCRIPT_FLAG), $(LD_FILES)) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
+LDFLAGS = $(CFLAGS) -nostartfiles -Wl,-nostdlib $(addprefix $(LD_SCRIPT_FLAG), $(LD_FILES)) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
 LIBS := -lgcc -lc -lnosys -lm
 
 # Use toolchain libm if we're not using our own.
diff --git a/ports/nrf/Makefile b/ports/nrf/Makefile
index 8a7b1104b9..44d1f3de2d 100755
--- a/ports/nrf/Makefile
+++ b/ports/nrf/Makefile
@@ -93,7 +93,7 @@ else
 endif
 
 
-CFLAGS += $(INC) -Wall -Werror -std=gnu11 -nostdlib $(BASE_CFLAGS) $(CFLAGS_MOD) $(COPT)
+CFLAGS += $(INC) -Wall -Werror -std=gnu11 -nostdlib -fshort-enums $(BASE_CFLAGS) $(CFLAGS_MOD) $(COPT)
 
 # Undo some warnings.
 # nrfx uses undefined preprocessor variables quite casually, so we can't do warning checks for these.
@@ -114,7 +114,7 @@ CFLAGS += \
 # TODO: check this
 CFLAGS += -D__START=main
 
-LDFLAGS = $(CFLAGS) -nostartfiles -fshort-enums -Wl,-nostdlib -Wl,-T,$(GENERATED_LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
+LDFLAGS = $(CFLAGS) -nostartfiles -Wl,-nostdlib -Wl,-T,$(GENERATED_LD_FILE) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
 LIBS := -lgcc -lc
 
 LDFLAGS += -mthumb -mcpu=cortex-m4
diff --git a/ports/stm/Makefile b/ports/stm/Makefile
index b667990bda..bd69d6fd7a 100755
--- a/ports/stm/Makefile
+++ b/ports/stm/Makefile
@@ -94,7 +94,7 @@ endif
 # MCU Series is defined by the HAL package and doesn't need to be specified here
 C_DEFS = -D$(MCU_PACKAGE) -DUSE_HAL_DRIVER -DUSE_FULL_LL_DRIVER -D$(MCU_VARIANT)
 
-CFLAGS += $(INC) -Werror -Wall -std=gnu11 $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT) -nostdlib -nostartfiles
+CFLAGS += $(INC) -Werror -Wall -std=gnu11 -fshort-enums $(BASE_CFLAGS) $(C_DEFS) $(CFLAGS_MOD) $(COPT) -nostdlib -nostartfiles
 
 # Undo some warnings.
 # STM32 HAL uses undefined preprocessor variables, shadowed variables, casts that change alignment reqs
@@ -136,7 +136,7 @@ ifndef BOOTLOADER_OFFSET
 	BOOTLOADER_OFFSET := 0x8000000
 endif
 
-LDFLAGS = $(CFLAGS) -fshort-enums -Wl,-nostdlib -Wl,-T,$(LD_FILE) -Wl,-T,$(LD_COMMON) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
+LDFLAGS = $(CFLAGS) -Wl,-nostdlib -Wl,-T,$(LD_FILE) -Wl,-T,$(LD_COMMON) -Wl,-Map=$@.map -Wl,-cref -Wl,-gc-sections -specs=nano.specs
 LIBS := -lgcc -lc
 
 # Use toolchain libm if we're not using our own.
diff --git a/py/circuitpy_defns.mk b/py/circuitpy_defns.mk
index 9e36f2e6a2..46e8d43d3c 100644
--- a/py/circuitpy_defns.mk
+++ b/py/circuitpy_defns.mk
@@ -48,7 +48,6 @@ BASE_CFLAGS = \
 	-D__$(CHIP_VARIANT)__ \
 	-ffunction-sections \
 	-fdata-sections \
-	-fshort-enums \
 	-DCIRCUITPY_SOFTWARE_SAFE_MODE=0x0ADABEEF \
 	-DCIRCUITPY_CANARY_WORD=0xADAF00 \
 	-DCIRCUITPY_SAFE_RESTART_WORD=0xDEADBEEF \
diff --git a/py/circuitpy_mpconfig.h b/py/circuitpy_mpconfig.h
index 5f2605c92f..62ef9062dd 100644
--- a/py/circuitpy_mpconfig.h
+++ b/py/circuitpy_mpconfig.h
@@ -121,7 +121,9 @@
 #define MICROPY_REPL_EVENT_DRIVEN        (0)
 #define MICROPY_STACK_CHECK              (1)
 #define MICROPY_STREAMS_NON_BLOCK        (1)
+#ifndef MICROPY_USE_INTERNAL_PRINTF
 #define MICROPY_USE_INTERNAL_PRINTF      (1)
+#endif
 
 // fatfs configuration used in ffconf.h
 //