diff --git a/ports/stm32f4/boards/STM32F412ZGTx_FLASH.ld b/ports/stm32f4/boards/STM32F412ZGTx_FLASH.ld
index bf7014ad1e..e0586709e6 100644
--- a/ports/stm32f4/boards/STM32F412ZGTx_FLASH.ld
+++ b/ports/stm32f4/boards/STM32F412ZGTx_FLASH.ld
@@ -1,5 +1,5 @@
 /*
-    GNU linker script for STM32F411 via Micropython
+    GNU linker script for STM32F412
 */
 
 /* Specify the memory areas */
@@ -51,8 +51,6 @@ SECTIONS
         . = ALIGN(4);
         *(.text*)          /* .text* sections (code) */
         *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
-    /*  *(.glue_7)   */    /* glue arm to thumb code */
-    /*  *(.glue_7t)  */    /* glue thumb to arm code */
 
         . = ALIGN(4);
         _etext = .;        /* define a global symbol at end of code */
diff --git a/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk b/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk
index c7a87a9935..e9ba938051 100644
--- a/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk
+++ b/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk
@@ -3,7 +3,7 @@ USB_PID = 0x572B
 USB_PRODUCT = "STM32F412ZG Discovery Board - CPy"
 USB_MANUFACTURER = "STMicroelectronics"
 
-USB_CDC_AND_MSC_ONLY = 1
+USB_DEVICES = "CDC,MSC"
 INTERNAL_FLASH_FILESYSTEM = 1
 LONGINT_IMPL = NONE
 
diff --git a/ports/stm32f4/supervisor/usb.c b/ports/stm32f4/supervisor/usb.c
index 034d5801be..3a4d62659d 100644
--- a/ports/stm32f4/supervisor/usb.c
+++ b/ports/stm32f4/supervisor/usb.c
@@ -33,42 +33,46 @@
 #include "stm32f4xx_hal.h"
 
 void init_usb_hardware(void) {
-  GPIO_InitTypeDef GPIO_InitStruct = {0};
-  /**USB_OTG_FS GPIO Configuration
-  PA10     ------> USB_OTG_FS_ID
-  PA11     ------> USB_OTG_FS_DM
-  PA12     ------> USB_OTG_FS_DP 
-  */
-  __HAL_RCC_GPIOA_CLK_ENABLE();
+    //TODO: if future chips overload this with options, move to peripherals management. 
 
-    /* Configure DM DP Pins */
-  GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    /**USB_OTG_FS GPIO Configuration
+    PA10     ------> USB_OTG_FS_ID
+    PA11     ------> USB_OTG_FS_DM
+    PA12     ------> USB_OTG_FS_DP 
+    */
+    __HAL_RCC_GPIOA_CLK_ENABLE();
 
-  /* Configure VBUS Pin */
-  GPIO_InitStruct.Pin = GPIO_PIN_9;
-  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+      /* Configure DM DP Pins */
+    GPIO_InitStruct.Pin = GPIO_PIN_11 | GPIO_PIN_12;
+    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  /* This for ID line debug */
-  GPIO_InitStruct.Pin = GPIO_PIN_10;
-  GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
-  GPIO_InitStruct.Pull = GPIO_PULLUP;
-  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
-  GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
-  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    /* Configure VBUS Pin */
+    GPIO_InitStruct.Pin = GPIO_PIN_9;
+    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  /* Configure POWER_SWITCH IO pin (F412 ONLY)*/
-  GPIO_InitStruct.Pin = GPIO_PIN_8;
-  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
-  GPIO_InitStruct.Pull = GPIO_NOPULL;
-  HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
+    /* This for ID line debug */
+    GPIO_InitStruct.Pin = GPIO_PIN_10;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF10_OTG_FS;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  /* Peripheral clock enable */
-  __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
+#ifdef STM32F412Zx
+    /* Configure POWER_SWITCH IO pin (F412 ONLY)*/
+    GPIO_InitStruct.Pin = GPIO_PIN_8;
+    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
+#endif
+
+    /* Peripheral clock enable */
+    __HAL_RCC_USB_OTG_FS_CLK_ENABLE();
 }