diff --git a/Tools/AP_Bootloader/mcu_f4.h b/Tools/AP_Bootloader/mcu_f4.h
index e189942568..6f5ed61667 100644
--- a/Tools/AP_Bootloader/mcu_f4.h
+++ b/Tools/AP_Bootloader/mcu_f4.h
@@ -29,12 +29,12 @@ const mcu_des_t mcu_descriptions[] = {
 };
 
 const mcu_rev_t silicon_revs[] = {
-    {MCU_REV_STM32F4_REV_3, '3', false}, /* Revision 3 */
+    {MCU_REV_STM32F4_REV_3, '3'}, /* Revision 3 */
 
-    {MCU_REV_STM32F4_REV_A, 'A', true}, /* Revision A */
-    {MCU_REV_STM32F4_REV_Z, 'Z', true}, /* Revision Z */
-    {MCU_REV_STM32F4_REV_Y, 'Y', true}, /* Revision Y */
-    {MCU_REV_STM32F4_REV_1, '1', true}, /* Revision 1 */
+    {MCU_REV_STM32F4_REV_A, 'A'}, /* Revision A */
+    {MCU_REV_STM32F4_REV_Z, 'Z'}, /* Revision Z */
+    {MCU_REV_STM32F4_REV_Y, 'Y'}, /* Revision Y */
+    {MCU_REV_STM32F4_REV_1, '1'}, /* Revision 1 */
 };
 
 #endif // STM32F4
diff --git a/Tools/AP_Bootloader/mcu_h7.h b/Tools/AP_Bootloader/mcu_h7.h
index 2b95577871..5a0cc2ae31 100644
--- a/Tools/AP_Bootloader/mcu_h7.h
+++ b/Tools/AP_Bootloader/mcu_h7.h
@@ -13,10 +13,10 @@ mcu_des_t mcu_descriptions[] = {
 };
 
 const mcu_rev_t silicon_revs[] = {
-    {0x1001, 'Z', false},
-    {0x1003, 'Y', false},
-    {0x2001, 'X', false},
-    {0x2003, 'V', false},
+    {0x1001, 'Z'},
+    {0x1003, 'Y'},
+    {0x2001, 'X'},
+    {0x2003, 'V'},
 };
 
 #endif // STM32H7
diff --git a/Tools/AP_Bootloader/support.cpp b/Tools/AP_Bootloader/support.cpp
index 2f1b17ca08..1b92efac55 100644
--- a/Tools/AP_Bootloader/support.cpp
+++ b/Tools/AP_Bootloader/support.cpp
@@ -274,24 +274,6 @@ uint32_t get_mcu_desc(uint32_t max, uint8_t *revstr)
     return  strp - revstr;
 }
 
-/*
-  see if we should limit flash to 1M on devices with older revisions
- */
-bool check_limit_flash_1M(void)
-{
-#ifdef STM32F427xx
-    uint32_t idcode = (*(uint32_t *)DBGMCU_BASE);
-    uint16_t revid = ((idcode & REVID_MASK) >> 16);
-
-    for (int i = 0; i < ARRAY_SIZE(silicon_revs); i++) {
-        if (silicon_revs[i].revid == revid) {
-            return silicon_revs[i].limit_flash_size_1M;
-        }
-    }
-#endif
-    return false;
-}
-
 void led_on(unsigned led)
 {
 #ifdef HAL_GPIO_PIN_LED_BOOTLOADER
diff --git a/Tools/AP_Bootloader/support.h b/Tools/AP_Bootloader/support.h
index 12a7730d11..cc2dd99c53 100644
--- a/Tools/AP_Bootloader/support.h
+++ b/Tools/AP_Bootloader/support.h
@@ -36,7 +36,6 @@ bool flash_write_buffer(uint32_t address, const uint32_t *v, uint8_t nwords);
 
 uint32_t get_mcu_id(void);
 uint32_t get_mcu_desc(uint32_t len, uint8_t *buf);
-bool check_limit_flash_1M(void);
 
 uint32_t board_get_rtc_signature(void);
 void board_set_rtc_signature(uint32_t sig);
@@ -62,5 +61,4 @@ typedef struct mcu_des_t {
 typedef struct mcu_rev_t {
     uint16_t revid;
     char  rev;
-    bool limit_flash_size_1M;
 } mcu_rev_t;