diff --git a/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32H750xx.py b/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32H750xx.py
index 1d7d9ac433..f16d729f7a 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32H750xx.py
+++ b/libraries/AP_HAL_ChibiOS/hwdef/scripts/STM32H750xx.py
@@ -40,13 +40,13 @@ mcu = {
     'RAM_MAP_EXTERNAL_FLASH' : [
 		# SSBL checks that stack is in this region so needs to come first
         (0x30000000, 256, 0), # SRAM1, SRAM2
-        (0x24000000, 256, 4), # AXI SRAM. Use this for SDMMC IDMA ops
+        (0x24000000, 128, 4), # AXI SRAM. Use this for SDMMC IDMA ops
         (0x20000000,  64, 2), # DTCM, tightly coupled, no DMA, fast
         (0x30040000,  32, 0), # SRAM3.
         (0x38000000,  64, 1), # SRAM4.
     ],
     'INSTRUCTION_RAM' : (0x00000400,  63), # ITCM (first 1k removed, to keep address 0 unused)
-    'FLASH_RAM' : 		(0x24040000, 256), # AXI SRAM used for process stack and ram functions
+    'FLASH_RAM' : 		(0x24020000, 384), # AXI SRAM used for process stack and ram functions
     'DATA_RAM' :        (0x20010000,  64), # DTCM, tightly coupled, no DMA, fast
 
     # avoid a problem in the bootloader by making DTCM first. The DCache init
@@ -206,7 +206,7 @@ AltFunction_map = {
 	"PA10:TIM1_CH3"     	:	1,
 	"PA10:USART1_RX"    	:	7,
 	"PA10:USB_OTG_FS_ID"	:	10,
-	"PA11:FDCAN1_RX"    	:	9,
+	"PA11:CAN1_RX"    	:	9,
 	"PA11:HRTIM_CHD1"   	:	2,
 	"PA11:I2S2_WS"      	:	5,
 	"PA11:LPUART1_CTS"  	:	3,
@@ -217,7 +217,7 @@ AltFunction_map = {
 	"PA11:USART1_CTS"   	:	7,
 	"PA11:USART1_NSS"   	:	7,
 	"PA11:OTG_FS_DM"		:	10,
-	"PA12:FDCAN1_TX"    	:	9,
+	"PA12:CAN1_TX"    	:	9,
 	"PA12:HRTIM_CHD2"   	:	2,
 	"PA12:I2S2_CK"      	:	5,
 	"PA12:LPUART1_DE"   	:	3,
@@ -297,7 +297,7 @@ AltFunction_map = {
 	"PB4:UART7_TX"      	:	11,
 	"PB5:DCMI_D10"      	:	13,
 	"PB5:ETH_PPS_OUT"   	:	11,
-	"PB5:FDCAN2_RX"     	:	9,
+	"PB5:CAN2_RX"     	:	9,
 	"PB5:FMC_SDCKE1"    	:	12,
 	"PB5:HRTIM_EEV7"    	:	3,
 	"PB5:I2C1_SMBA"     	:	4,
@@ -314,7 +314,7 @@ AltFunction_map = {
 	"PB6:CEC"           	:	5,
 	"PB6:DCMI_D5"       	:	13,
 	"PB6:DFSDM1_DATIN5" 	:	11,
-	"PB6:FDCAN2_TX"     	:	9,
+	"PB6:CAN2_TX"     	:	9,
 	"PB6:FMC_SDNE1"     	:	12,
 	"PB6:HRTIM_EEV8"    	:	3,
 	"PB6:I2C1_SCL"      	:	4,
@@ -338,7 +338,7 @@ AltFunction_map = {
 	"PB8:DCMI_D6"       	:	13,
 	"PB8:DFSDM1_CKIN7"  	:	3,
 	"PB8:ETH_TXD3"      	:	11,
-	"PB8:FDCAN1_RX"     	:	9,
+	"PB8:CAN1_RX"     	:	9,
 	"PB8:I2C1_SCL"      	:	4,
 	"PB8:I2C4_SCL"      	:	6,
 	"PB8:LTDC_B6"       	:	14,
@@ -350,7 +350,7 @@ AltFunction_map = {
 	"PB8:UART4_RX"      	:	8,
 	"PB9:DCMI_D7"       	:	13,
 	"PB9:DFSDM1_DATIN7" 	:	3,
-	"PB9:FDCAN1_TX"     	:	9,
+	"PB9:CAN1_TX"     	:	9,
 	"PB9:I2C1_SDA"      	:	4,
 	"PB9:I2C4_SDA"      	:	6,
 	"PB9:I2C4_SMBA"     	:	11,
@@ -386,7 +386,7 @@ AltFunction_map = {
 	"PB11:USB_OTG_HS_ULPI_D4"	:	10,
 	"PB12:DFSDM1_DATIN1"	:	6,
 	"PB12:ETH_TXD0"     	:	11,
-	"PB12:FDCAN2_RX"    	:	9,
+	"PB12:CAN2_RX"    	:	9,
 	"PB12:I2C2_SMBA"    	:	4,
 	"PB12:I2S2_WS"      	:	5,
 	"PB12:SPI2_NSS"     	:	5,
@@ -399,7 +399,7 @@ AltFunction_map = {
 	"PB12:USB_OTG_HS_ULPI_D5"	:	10,
 	"PB13:DFSDM1_CKIN1" 	:	6,
 	"PB13:ETH_TXD1"     	:	11,
-	"PB13:FDCAN2_TX"    	:	9,
+	"PB13:CAN2_TX"    	:	9,
 	"PB13:I2S2_CK"      	:	5,
 	"PB13:LPTIM2_OUT"   	:	3,
 	"PB13:SPI2_SCK"     	:	5,
@@ -553,13 +553,13 @@ AltFunction_map = {
 	"PC12:UART5_TX"     	:	8,
 	"PC12:USART3_CK"    	:	7,
 	"PD0:DFSDM1_CKIN6"  	:	3,
-	"PD0:FDCAN1_RX"     	:	9,
+	"PD0:CAN1_RX"     	:	9,
 	"PD0:FMC_D2"        	:	12,
 	"PD0:FMC_DA2"       	:	12,
 	"PD0:SAI3_SCK_A"    	:	6,
 	"PD0:UART4_RX"      	:	8,
 	"PD1:DFSDM1_DATIN6" 	:	3,
-	"PD1:FDCAN1_TX"     	:	9,
+	"PD1:CAN1_TX"     	:	9,
 	"PD1:FMC_D3"        	:	12,
 	"PD1:FMC_DA3"       	:	12,
 	"PD1:SAI3_SD_A"     	:	6,
@@ -984,13 +984,13 @@ AltFunction_map = {
 	"PH12:I2C4_SDA"     	:	4,
 	"PH12:LTDC_R6"      	:	14,
 	"PH12:TIM5_CH3"     	:	2,
-	"PH13:FDCAN1_TX"    	:	9,
+	"PH13:CAN1_TX"    	:	9,
 	"PH13:FMC_D21"      	:	12,
 	"PH13:LTDC_G2"      	:	14,
 	"PH13:TIM8_CH1N"    	:	3,
 	"PH13:UART4_TX"     	:	8,
 	"PH14:DCMI_D4"      	:	13,
-	"PH14:FDCAN1_RX"    	:	9,
+	"PH14:CAN1_RX"    	:	9,
 	"PH14:FMC_D22"      	:	12,
 	"PH14:LTDC_G3"      	:	14,
 	"PH14:TIM8_CH2N"    	:	3,
@@ -1046,7 +1046,7 @@ AltFunction_map = {
 	"PI7:LTDC_B7"       	:	14,
 	"PI7:SAI2_FS_A"     	:	10,
 	"PI7:TIM8_CH3"      	:	3,
-	"PI9:FDCAN1_RX"     	:	9,
+	"PI9:CAN1_RX"     	:	9,
 	"PI9:FMC_D30"       	:	12,
 	"PI9:LTDC_VSYNC"    	:	14,
 	"PI9:UART4_RX"      	:	8,