diff --git a/ports/atmel-samd/boards/winterbloom_big_honking_button/mpconfigboard.mk b/ports/atmel-samd/boards/winterbloom_big_honking_button/mpconfigboard.mk
index 71586d6e05..ab2b861c03 100644
--- a/ports/atmel-samd/boards/winterbloom_big_honking_button/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/winterbloom_big_honking_button/mpconfigboard.mk
@@ -9,8 +9,8 @@ CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
 
 SPI_FLASH_FILESYSTEM = 1
-EXTERNAL_FLASH_DEVICE_COUNT = 1
-EXTERNAL_FLASH_DEVICES = "GD25Q16C"
+EXTERNAL_FLASH_DEVICE_COUNT = 2
+EXTERNAL_FLASH_DEVICES = "GD25Q16C, GD25Q64C"
 LONGINT_IMPL = MPZ
 
 CIRCUITPY_AUDIOIO = 1
diff --git a/ports/atmel-samd/boards/winterbloom_big_honking_button/pins.c b/ports/atmel-samd/boards/winterbloom_big_honking_button/pins.c
index f325529f39..a079929447 100644
--- a/ports/atmel-samd/boards/winterbloom_big_honking_button/pins.c
+++ b/ports/atmel-samd/boards/winterbloom_big_honking_button/pins.c
@@ -6,5 +6,7 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_GATE_OUT), MP_ROM_PTR(&pin_PA11) },
     { MP_ROM_QSTR(MP_QSTR_GATE_IN), MP_ROM_PTR(&pin_PA14) },
     { MP_ROM_QSTR(MP_QSTR_PITCH_IN), MP_ROM_PTR(&pin_PB08) },
+    /* Board revisions starting from v5 have PB10 tied to ground. */
+    { MP_ROM_QSTR(MP_QSTR_V5), MP_ROM_PTR(&pin_PB10) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_global_dict_table);