diff --git a/ports/atmel-samd/asf4_conf/samd51/hpl_osc32kctrl_config.h b/ports/atmel-samd/asf4_conf/samd51/hpl_osc32kctrl_config.h
index ccb2627480..d93cbf922e 100644
--- a/ports/atmel-samd/asf4_conf/samd51/hpl_osc32kctrl_config.h
+++ b/ports/atmel-samd/asf4_conf/samd51/hpl_osc32kctrl_config.h
@@ -17,7 +17,7 @@
 // <i> This defines the clock source for RTC
 // <id> rtc_source_oscillator
 #ifndef CONF_RTCCTRL_SRC
-#define CONF_RTCCTRL_SRC GCLK_GENCTRL_SRC_XOSC32K
+#define CONF_RTCCTRL_SRC GCLK_GENCTRL_SRC_OSCULP32K
 #endif
 
 // <q> Use 1 kHz output
diff --git a/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.h b/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.h
index 63fbc8cb8b..95c542a43e 100644
--- a/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.h
@@ -7,10 +7,12 @@
 #define MICROPY_HW_APA102_MOSI   (&pin_PB03)
 #define MICROPY_HW_APA102_SCK    (&pin_PB02)
 
+#define CIRCUITPY_BITBANG_APA102
+
 // These are pins not to reset.
-// QSPI Data pins and TX LED
+// QSPI Data pins
 #define MICROPY_PORT_A (PORT_PA08 | PORT_PA09 | PORT_PA10 | PORT_PA11)
-// RX LED, QSPI CS, QSPI SCK and NeoPixel pin
+// DotStar pins, QSPI CS, and QSPI SCK
 #define MICROPY_PORT_B (PORT_PB02 | PORT_PB03 | PORT_PB10 | PORT_PB11)
 #define MICROPY_PORT_C (0)
 #define MICROPY_PORT_D (0)
@@ -25,7 +27,7 @@
 
 #include "external_flash/devices.h"
 
-#define EXTERNAL_FLASH_DEVICE_COUNT 3
-#define EXTERNAL_FLASH_DEVICES S25FL116K, S25FL216K, GD25Q16C
+#define EXTERNAL_FLASH_DEVICE_COUNT 1
+#define EXTERNAL_FLASH_DEVICES GD25Q16C
 
 #include "external_flash/external_flash.h"