diff --git a/ports/cxd56/README.md b/ports/cxd56/README.md
index 0656ad1f1a..4266c61c0c 100644
--- a/ports/cxd56/README.md
+++ b/ports/cxd56/README.md
@@ -75,7 +75,7 @@ Bootloader information:
 
 * You have to accept the End User License Agreement to be able to download and use the Spresense bootloader binary.
 
-Download the spresense binaries zip archive from: [Spresense firmware v2-3-000](https://developer.sony.com/file/download/download-spresense-firmware-v2-3-000)
+Download the spresense binaries zip archive from: [Spresense firmware v2-4-000](https://developer.sony.com/file/download/download-spresense-firmware-v2-4-000)
 
 Extract spresense binaries in your PC to ports/spresense/spresense-exported-sdk/firmware/
 
diff --git a/ports/cxd56/common-hal/camera/Camera.c b/ports/cxd56/common-hal/camera/Camera.c
index f304ed8f74..606ad0f1e6 100644
--- a/ports/cxd56/common-hal/camera/Camera.c
+++ b/ports/cxd56/common-hal/camera/Camera.c
@@ -47,7 +47,7 @@ typedef struct {
     uint16_t height;
 } image_size_t;
 
-STATIC const image_size_t image_size_table[] = {
+STATIC const image_size_t isx012_image_size_table[] = {
     { VIDEO_HSIZE_QVGA, VIDEO_VSIZE_QVGA },
     { VIDEO_HSIZE_VGA, VIDEO_VSIZE_VGA },
     { VIDEO_HSIZE_HD, VIDEO_VSIZE_HD },
@@ -57,12 +57,40 @@ STATIC const image_size_t image_size_table[] = {
     { VIDEO_HSIZE_5M, VIDEO_VSIZE_5M },
 };
 
+STATIC const image_size_t isx019_image_size_table[] = {
+    { VIDEO_HSIZE_QVGA, VIDEO_VSIZE_QVGA },
+    { VIDEO_HSIZE_VGA, VIDEO_VSIZE_VGA },
+    { VIDEO_HSIZE_HD, VIDEO_VSIZE_HD },
+    { VIDEO_HSIZE_QUADVGA, VIDEO_VSIZE_QUADVGA },
+};
+
+static const char *get_imgsensor_name() {
+    static struct v4l2_capability cap;
+
+    ioctl(camera_dev.fd, VIDIOC_QUERYCAP, (unsigned long)&cap);
+
+    return (const char *)cap.driver;
+}
+
 static bool camera_check_width_and_height(uint16_t width, uint16_t height) {
-    for (int i = 0; i < MP_ARRAY_SIZE(image_size_table); i++) {
-        if (image_size_table[i].width == width && image_size_table[i].height == height) {
-            return true;
+    const char *sensor;
+
+    sensor = get_imgsensor_name();
+
+    if (strncmp(sensor, "ISX012", strlen("ISX012")) == 0) {
+        for (int i = 0; i < MP_ARRAY_SIZE(isx012_image_size_table); i++) {
+            if (isx012_image_size_table[i].width == width && isx012_image_size_table[i].height == height) {
+                return true;
+            }
+        }
+    } else if (strncmp(sensor, "ISX019", strlen("ISX019"))) {
+        for (int i = 0; i < MP_ARRAY_SIZE(isx019_image_size_table); i++) {
+            if (isx019_image_size_table[i].width == width && isx019_image_size_table[i].height == height) {
+                return true;
+            }
         }
     }
+
     return false;
 }
 
diff --git a/ports/cxd56/configs/circuitpython/defconfig b/ports/cxd56/configs/circuitpython/defconfig
index 6a7c39cba8..92e282649b 100644
--- a/ports/cxd56/configs/circuitpython/defconfig
+++ b/ports/cxd56/configs/circuitpython/defconfig
@@ -113,4 +113,5 @@ CONFIG_USEC_PER_TICK=1000
 CONFIG_USERMAIN_STACKSIZE=8192
 CONFIG_USER_ENTRYPOINT="spresense_main"
 CONFIG_VIDEO_ISX012=y
+CONFIG_VIDEO_ISX019=y
 CONFIG_VIDEO_STREAM=y
diff --git a/ports/cxd56/spresense-exported-sdk b/ports/cxd56/spresense-exported-sdk
index 6a148be849..4f902ca3ff 160000
--- a/ports/cxd56/spresense-exported-sdk
+++ b/ports/cxd56/spresense-exported-sdk
@@ -1 +1 @@
-Subproject commit 6a148be8497704d4afb5d14c175a12a592813fac
+Subproject commit 4f902ca3ffeb327e6c325940ef5133eda588c2e4
diff --git a/ports/cxd56/supervisor/port.c b/ports/cxd56/supervisor/port.c
index 10fa4112e8..dfd3cd6646 100644
--- a/ports/cxd56/supervisor/port.c
+++ b/ports/cxd56/supervisor/port.c
@@ -111,13 +111,13 @@ bool port_has_fixed_stack(void) {
 uint32_t *port_stack_get_limit(void) {
     struct tcb_s *rtcb = this_task();
 
-    return rtcb->adj_stack_ptr - (uint32_t)rtcb->adj_stack_size;
+    return rtcb->stack_base_ptr;
 }
 
 uint32_t *port_stack_get_top(void) {
     struct tcb_s *rtcb = this_task();
 
-    return rtcb->adj_stack_ptr;
+    return rtcb->stack_base_ptr + (uint32_t)rtcb->adj_stack_size;
 }
 
 uint32_t *port_heap_get_bottom(void) {
diff --git a/ports/raspberrypi/common-hal/rp2pio/StateMachine.c b/ports/raspberrypi/common-hal/rp2pio/StateMachine.c
index ecaee90cc2..e9cb3d34bb 100644
--- a/ports/raspberrypi/common-hal/rp2pio/StateMachine.c
+++ b/ports/raspberrypi/common-hal/rp2pio/StateMachine.c
@@ -289,6 +289,11 @@ bool rp2pio_statemachine_construct(rp2pio_statemachine_obj_t *self,
             }
             pio_gpio_init(self->pio, pin_number);
         }
+
+        // Use lowest drive level for all State Machine outputs. (#7515
+        // workaround). Remove if/when Pin objects get a drive_strength
+        // property and use that value instead.
+        gpio_set_drive_strength(pin_number, GPIO_DRIVE_STRENGTH_2MA);
     }
 
     pio_sm_config c = {0, 0, 0};
diff --git a/py/objexcept.c b/py/objexcept.c
index 976535754b..24fb564e23 100644
--- a/py/objexcept.c
+++ b/py/objexcept.c
@@ -155,6 +155,12 @@ void mp_obj_exception_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kin
     mp_obj_tuple_print(print, MP_OBJ_FROM_PTR(o->args), kind);
 }
 
+void mp_obj_exception_initialize0(mp_obj_exception_t *o_exc, const mp_obj_type_t *type) {
+    o_exc->base.type = type;
+    o_exc->args = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
+    mp_obj_exception_clear_traceback(o_exc);
+}
+
 mp_obj_t mp_obj_exception_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, MP_OBJ_FUN_ARGS_MAX, false);
 
@@ -583,6 +589,12 @@ void mp_obj_exception_clear_traceback(mp_obj_t self_in) {
     // just set the traceback to the empty traceback object
     // we don't want to call any memory management functions here
     self->traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;
+    #if MICROPY_CPYTHON_EXCEPTION_CHAIN
+    self->cause = 0;
+    self->context = 0;
+    self->suppress_context = false;
+    self->marked = false;
+    #endif
 }
 
 void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, size_t line, qstr block) {
diff --git a/py/objexcept.h b/py/objexcept.h
index 77b338e951..1230fdf18a 100644
--- a/py/objexcept.h
+++ b/py/objexcept.h
@@ -43,6 +43,7 @@ typedef struct _mp_obj_exception_t {
 
 void mp_obj_exception_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind);
 void mp_obj_exception_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest);
+void mp_obj_exception_initialize0(mp_obj_exception_t *o_exc, const mp_obj_type_t *type);
 mp_obj_exception_t *mp_obj_exception_get_native(mp_obj_t self_in);
 
 #define MP_DEFINE_EXCEPTION(exc_name, base_name) \
diff --git a/py/objgenerator.c b/py/objgenerator.c
index 2256911e23..7c3ec99307 100644
--- a/py/objgenerator.c
+++ b/py/objgenerator.c
@@ -40,10 +40,11 @@
 // Instance of GeneratorExit exception - needed by generator.close()
 #if MICROPY_CONST_GENERATOREXIT_OBJ
 const
+mp_obj_exception_t mp_static_GeneratorExit_obj = {{&mp_type_GeneratorExit}, (mp_obj_tuple_t *)&mp_const_empty_tuple_obj, (mp_obj_traceback_t *)&mp_const_empty_traceback_obj};
 #else
 static
+mp_obj_exception_t mp_static_GeneratorExit_obj;
 #endif
-mp_obj_exception_t mp_static_GeneratorExit_obj = {{&mp_type_GeneratorExit}, (mp_obj_tuple_t *)&mp_const_empty_tuple_obj, (mp_obj_traceback_t *)&mp_const_empty_traceback_obj};
 
 /******************************************************************************/
 /* generator wrapper                                                          */
@@ -370,9 +371,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(gen_instance_throw_obj, 2, 4, gen_ins
 static mp_obj_t generatorexit(void) {
     #if MICROPY_CPYTHON_EXCEPTION_CHAIN
     MP_STATIC_ASSERT(!MICROPY_CONST_GENERATOREXIT_OBJ);
-    mp_static_GeneratorExit_obj.context = NULL;
-    mp_static_GeneratorExit_obj.cause = NULL;
-    mp_static_GeneratorExit_obj.suppress_context = false;
+    mp_obj_exception_initialize0(&mp_static_GeneratorExit_obj, &mp_type_GeneratorExit);
     #endif
     return MP_OBJ_FROM_PTR(&mp_static_GeneratorExit_obj);
 }
diff --git a/py/runtime.c b/py/runtime.c
index 9779456d0c..9227594d83 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -78,14 +78,10 @@ void mp_init(void) {
 
     #if MICROPY_KBD_EXCEPTION
     // initialise the exception object for raising KeyboardInterrupt
-    MP_STATE_VM(mp_kbd_exception).base.type = &mp_type_KeyboardInterrupt;
-    MP_STATE_VM(mp_kbd_exception).args = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
-    MP_STATE_VM(mp_kbd_exception).traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;
+    mp_obj_exception_initialize0(&MP_STATE_VM(mp_kbd_exception), &mp_type_KeyboardInterrupt);
     #endif
 
-    MP_STATE_VM(mp_reload_exception).base.type = &mp_type_ReloadException;
-    MP_STATE_VM(mp_reload_exception).args = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
-    MP_STATE_VM(mp_reload_exception).traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;
+    mp_obj_exception_initialize0(&MP_STATE_VM(mp_reload_exception), &mp_type_ReloadException);
 
     // call port specific initialization if any
     #ifdef MICROPY_PORT_INIT_FUNC
diff --git a/shared-module/displayio/I2CDisplay.c b/shared-module/displayio/I2CDisplay.c
index 8fae5d31fd..f38e4d6296 100644
--- a/shared-module/displayio/I2CDisplay.c
+++ b/shared-module/displayio/I2CDisplay.c
@@ -54,6 +54,7 @@ void common_hal_displayio_i2cdisplay_construct(displayio_i2cdisplay_obj_t *self,
     // Probe the bus to see if a device acknowledges the given address.
     if (!common_hal_busio_i2c_probe(i2c, device_address)) {
         self->base.type = &mp_type_NoneType;
+        common_hal_displayio_i2cdisplay_deinit(self);
         mp_raise_ValueError_varg(translate("Unable to find I2C Display at %x"), device_address);
     }