diff --git a/ports/stm32/sdcard.c b/ports/stm32/sdcard.c
index ea69e7285b..4e461749ac 100644
--- a/ports/stm32/sdcard.c
+++ b/ports/stm32/sdcard.c
@@ -60,6 +60,10 @@
 #define STATIC_AF_SDCARD_D1 STATIC_AF_SDMMC2_D1
 #define STATIC_AF_SDCARD_D2 STATIC_AF_SDMMC2_D2
 #define STATIC_AF_SDCARD_D3 STATIC_AF_SDMMC2_D3
+#define STATIC_AF_SDCARD_D4 STATIC_AF_SDMMC2_D4
+#define STATIC_AF_SDCARD_D5 STATIC_AF_SDMMC2_D5
+#define STATIC_AF_SDCARD_D6 STATIC_AF_SDMMC2_D6
+#define STATIC_AF_SDCARD_D7 STATIC_AF_SDMMC2_D7
 #else
 #define SDIO SDMMC1
 #define SDMMC_IRQHandler SDMMC1_IRQHandler
@@ -75,6 +79,10 @@
 #define STATIC_AF_SDCARD_D1 STATIC_AF_SDMMC1_D1
 #define STATIC_AF_SDCARD_D2 STATIC_AF_SDMMC1_D2
 #define STATIC_AF_SDCARD_D3 STATIC_AF_SDMMC1_D3
+#define STATIC_AF_SDCARD_D4 STATIC_AF_SDMMC1_D4
+#define STATIC_AF_SDCARD_D5 STATIC_AF_SDMMC1_D5
+#define STATIC_AF_SDCARD_D6 STATIC_AF_SDMMC1_D6
+#define STATIC_AF_SDCARD_D7 STATIC_AF_SDMMC1_D7
 #endif
 
 // The F7 & L4 series calls the peripheral SDMMC rather than SDIO, so provide some
@@ -120,6 +128,10 @@
 #define STATIC_AF_SDCARD_D1 STATIC_AF_SDIO_D1
 #define STATIC_AF_SDCARD_D2 STATIC_AF_SDIO_D2
 #define STATIC_AF_SDCARD_D3 STATIC_AF_SDIO_D3
+#define STATIC_AF_SDCARD_D4 STATIC_AF_SDIO_D4
+#define STATIC_AF_SDCARD_D5 STATIC_AF_SDIO_D5
+#define STATIC_AF_SDCARD_D6 STATIC_AF_SDIO_D6
+#define STATIC_AF_SDCARD_D7 STATIC_AF_SDIO_D7
 
 #endif
 
@@ -133,6 +145,13 @@
 #define MICROPY_HW_SDCARD_CMD (pin_D2)
 #endif
 
+// Define a constant to select the bus width.
+#if MICROPY_HW_SDCARD_BUS_WIDTH == 4
+#define SDIO_BUS_WIDE_VALUE SDIO_BUS_WIDE_4B
+#elif MICROPY_HW_SDCARD_BUS_WIDTH == 8
+#define SDIO_BUS_WIDE_VALUE SDIO_BUS_WIDE_8B
+#endif
+
 #define PYB_SDMMC_FLAG_SD       (0x01)
 #define PYB_SDMMC_FLAG_MMC      (0x02)
 #define PYB_SDMMC_FLAG_ACTIVE   (0x04)
@@ -162,10 +181,16 @@ void sdcard_init(void) {
     mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_CK, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_CK);
     mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_CMD, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_CMD);
     mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D0, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D0);
-    #if MICROPY_HW_SDCARD_BUS_WIDTH == 4
+    #if MICROPY_HW_SDCARD_BUS_WIDTH >= 4
     mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D1, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D1);
     mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D2, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D2);
     mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D3, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D3);
+    #if MICROPY_HW_SDCARD_BUS_WIDTH == 8
+    mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D4, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D4);
+    mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D5, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D5);
+    mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D6, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D6);
+    mp_hal_pin_config_alt_static(MICROPY_HW_SDCARD_D7, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_UP, STATIC_AF_SDCARD_D7);
+    #endif
     #endif
 
     // configure the SD card detect pin
@@ -252,9 +277,9 @@ STATIC HAL_StatusTypeDef sdmmc_init_sd(void) {
         mp_hal_delay_ms(50);
     }
 
-    #if MICROPY_HW_SDCARD_BUS_WIDTH == 4
-    // configure the SD bus width for 4-bit wide operation
-    status = HAL_SD_ConfigWideBusOperation(&sdmmc_handle.sd, SDIO_BUS_WIDE_4B);
+    #if MICROPY_HW_SDCARD_BUS_WIDTH >= 4
+    // configure the SD bus width for 4/8-bit wide operation
+    status = HAL_SD_ConfigWideBusOperation(&sdmmc_handle.sd, SDIO_BUS_WIDE_VALUE);
     if (status != HAL_OK) {
         HAL_SD_DeInit(&sdmmc_handle.sd);
         return status;
@@ -287,12 +312,12 @@ STATIC HAL_StatusTypeDef sdmmc_init_mmc(void) {
     // As this is an eMMC card, overwrite LogBlockNbr with actual value
     sdmmc_handle.mmc.MmcCard.LogBlockNbr = 7469056 + 2048;
 
-    #if MICROPY_HW_SDCARD_BUS_WIDTH == 4
-    // Configure the SDIO bus width for 4-bit wide operation
+    #if MICROPY_HW_SDCARD_BUS_WIDTH >= 4
+    // Configure the SDIO bus width for 4/8-bit wide operation
     #ifdef STM32F7
     sdmmc_handle.mmc.Init.ClockBypass = SDIO_CLOCK_BYPASS_ENABLE;
     #endif
-    status = HAL_MMC_ConfigWideBusOperation(&sdmmc_handle.mmc, SDIO_BUS_WIDE_4B);
+    status = HAL_MMC_ConfigWideBusOperation(&sdmmc_handle.mmc, SDIO_BUS_WIDE_VALUE);
     if (status != HAL_OK) {
         HAL_MMC_DeInit(&sdmmc_handle.mmc);
         return status;