diff --git a/bdev.c b/bdev.c
index 18b5b85..308d3bb 100644
--- a/bdev.c
+++ b/bdev.c
@@ -13,14 +13,18 @@ STATIC const mp_soft_spi_obj_t soft_spi_bus = {
     .miso = MICROPY_HW_SPIFLASH_MISO,
 };
 
+#if MICROPY_HW_SPIFLASH_ENABLE_CACHE
 STATIC mp_spiflash_cache_t spi_bdev_cache;
+#endif
 
 const mp_spiflash_config_t spiflash_config = {
     .bus_kind = MP_SPIFLASH_BUS_SPI,
     .bus.u_spi.cs = MICROPY_HW_SPIFLASH_CS,
     .bus.u_spi.data = (void*)&soft_spi_bus,
     .bus.u_spi.proto = &mp_soft_spi_proto,
+#if MICROPY_HW_SPIFLASH_ENABLE_CACHE
     .cache = &spi_bdev_cache,
+#endif
 };
 
 spi_bdev_t spi_bdev;
diff --git a/mpconfigboard.h b/mpconfigboard.h
index f439be3..0cd99b7 100644
--- a/mpconfigboard.h
+++ b/mpconfigboard.h
@@ -4,7 +4,10 @@
 
 // 1 = use internal flash (1 MByte)
 // 0 = use onboard SPI flash (2 MByte) Winbond W25Q16
-#define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (1)
+#define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (0)
+#if !BUILDING_MBOOT
+#define MICROPY_HW_SPIFLASH_ENABLE_CACHE (1)
+#endif
 
 #define MICROPY_HW_HAS_SWITCH       (1)		// has 1 button KEY0
 #define MICROPY_HW_HAS_FLASH        (1)
@@ -12,7 +15,7 @@
 #define MICROPY_HW_ENABLE_RTC       (1)
 #define MICROPY_HW_ENABLE_DAC       (1)
 #define MICROPY_HW_ENABLE_USB       (1)
-#define MICROPY_HW_ENABLE_SDCARD    (0)		// it has a sd scard, but i am not sure what the detect pin is, yet
+#define MICROPY_HW_ENABLE_SDCARD    (1)
 
 // HSE is 8MHz
 #define MICROPY_HW_CLK_PLLM (8) // divide external clock by this to get 1MHz