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diff --git a/platform/ext/target/arm/mps2/an521/iar/startup_cmsdk_mps2_an521_s.s b/platform/ext/target/arm/mps2/an521/iar/startup_cmsdk_mps2_an521_s.s
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+++ b/platform/ext/target/arm/mps2/an521/iar/startup_cmsdk_mps2_an521_s.s
@@ -0,0 +1,350 @@
+;/*
+; * Copyright (c) 2016-2020 ARM Limited
+; *
+; * Licensed under the Apache License, Version 2.0 (the "License");
+; * you may not use this file except in compliance with the License.
+; * You may obtain a copy of the License at
+; *
+; * http://www.apache.org/licenses/LICENSE-2.0
+; *
+; * Unless required by applicable law or agreed to in writing, software
+; * distributed under the License is distributed on an "AS IS" BASIS,
+; * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+; * See the License for the specific language governing permissions and
+; * limitations under the License.
+; */
+;
+; This file is derivative of ../armclang/startup_cmsdk_mps2_an521_s.s
+
+;/*
+;//-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
+;*/
+
+
+; <h> Stack Configuration
+; <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
+; </h>
+
+ MODULE ?cstartup
+
+ ;; Forward declaration of sections.
+ SECTION ARM_LIB_STACK_MSP:DATA:NOROOT(3)
+ SECTION ARM_LIB_STACK:DATA:NOROOT(3)
+
+ SECTION .intvec:CODE:NOROOT(2)
+
+ EXTERN __iar_program_start
+ EXTERN SystemInit
+ PUBLIC __vector_table
+ PUBLIC __Vectors
+ PUBLIC __Vectors_End
+ PUBLIC __Vectors_Size
+
+ DATA
+
+__vector_table ;Core Interrupts
+ DCD sfe(ARM_LIB_STACK_MSP) ; Top of Stack
+ DCD Reset_Handler ; Reset Handler
+ DCD NMI_Handler ; NMI Handler
+ DCD HardFault_Handler ; Hard Fault Handler
+ DCD MemManage_Handler ; MPU Fault Handler
+ DCD BusFault_Handler ; Bus Fault Handler
+ DCD UsageFault_Handler ; Usage Fault Handler
+ DCD SecureFault_Handler ; Secure Fault Handler
+ DCD 0 ; Reserved
+ DCD 0 ; Reserved
+ DCD 0 ; Reserved
+ DCD SVC_Handler ; SVCall Handler
+ DCD DebugMon_Handler ; Debug Monitor Handler
+ DCD 0 ; Reserved
+ DCD PendSV_Handler ; PendSV Handler
+ DCD SysTick_Handler ; SysTick Handler
+
+ ; Core IoT Interrupts
+ DCD NONSEC_WATCHDOG_RESET_Handler ; - 0 Non-Secure Watchdog Reset Handler
+ DCD NONSEC_WATCHDOG_Handler ; - 1 Non-Secure Watchdog Handler
+ DCD S32K_TIMER_Handler ; - 2 S32K Timer Handler
+ DCD TFM_TIMER0_IRQ_Handler ; - 3 TIMER 0 Handler
+ DCD TIMER1_Handler ; - 4 TIMER 1 Handler
+ DCD DUALTIMER_Handler ; - 5 Dual Timer Handler
+ DCD 0 ; Reserved - 6
+ DCD 0 ; Reserved - 7
+ DCD 0 ; Reserved - 8
+ DCD MPC_Handler ; - 9 MPC Combined (Secure) Handler
+ DCD PPC_Handler ; - 10 PPC Combined (Secure) Handler
+ DCD 0 ; Reserved - 11
+ DCD 0 ; Reserved - 12
+ DCD 0 ; Reserved - 13
+ DCD 0 ; Reserved - 14
+ DCD 0 ; Reserved - 15
+ DCD 0 ; Reserved - 16
+ DCD 0 ; Reserved - 17
+ DCD 0 ; Reserved - 18
+ DCD 0 ; Reserved - 19
+ DCD 0 ; Reserved - 20
+ DCD 0 ; Reserved - 21
+ DCD 0 ; Reserved - 22
+ DCD 0 ; Reserved - 23
+ DCD 0 ; Reserved - 24
+ DCD 0 ; Reserved - 25
+ DCD 0 ; Reserved - 26
+ DCD 0 ; Reserved - 27
+ DCD 0 ; Reserved - 28
+ DCD 0 ; Reserved - 29
+ DCD 0 ; Reserved - 30
+ DCD 0 ; Reserved - 31
+ ; External Interrupts
+ DCD UARTRX0_Handler ; 32 UART 0 RX Handler
+ DCD UARTTX0_Handler ; 33 UART 0 TX Handler
+ DCD UARTRX1_Handler ; 34 UART 1 RX Handler
+ DCD UARTTX1_Handler ; 35 UART 1 TX Handler
+ DCD UARTRX2_Handler ; 36 UART 2 RX Handler
+ DCD UARTTX2_Handler ; 37 UART 2 TX Handler
+ DCD UARTRX3_Handler ; 38 UART 3 RX Handler
+ DCD UARTTX3_Handler ; 39 UART 3 TX Handler
+ DCD UARTRX4_Handler ; 40 UART 4 RX Handler
+ DCD UARTTX4_Handler ; 41 UART 4 TX Handler
+ DCD UART0_Handler ; 42 UART 0 combined Handler
+ DCD UART1_Handler ; 43 UART 1 combined Handler
+ DCD UART2_Handler ; 44 UART 0 combined Handler
+ DCD UART3_Handler ; 45 UART 1 combined Handler
+ DCD UART4_Handler ; 46 UART 0 combined Handler
+ DCD UARTOVF_Handler ; 47 UART 0,1,2,3,4 Overflow Handler
+ DCD ETHERNET_Handler ; 48 Ethernet Handler
+ DCD I2S_Handler ; 49 I2S Handler
+ DCD TSC_Handler ; 50 Touch Screen Handler
+ DCD SPI0_Handler ; 51 SPI 0 Handler
+ DCD SPI1_Handler ; 52 SPI 1 Handler
+ DCD SPI2_Handler ; 53 SPI 2 Handler
+ DCD SPI3_Handler ; 54 SPI 3 Handler
+ DCD SPI4_Handler ; 55 SPI 4 Handler
+ DCD DMA0_ERROR_Handler ; 56 DMA 0 Error Handler
+ DCD DMA0_TC_Handler ; 57 DMA 0 Terminal Count Handler
+ DCD DMA0_Handler ; 58 DMA 0 Combined Handler
+ DCD DMA1_ERROR_Handler ; 59 DMA 1 Error Handler
+ DCD DMA1_TC_Handler ; 60 DMA 1 Terminal Count Handler
+ DCD DMA1_Handler ; 61 DMA 1 Combined Handler
+ DCD DMA2_ERROR_Handler ; 62 DMA 2 Error Handler
+ DCD DMA2_TC_Handler ; 63 DMA 2 Terminal Count Handler
+ DCD DMA2_Handler ; 64 DMA 2 Combined Handler
+ DCD DMA3_ERROR_Handler ; 65 DMA 3 Error Handler
+ DCD DMA3_TC_Handler ; 66 DMA 3 Terminal Count Handler
+ DCD DMA3_Handler ; 67 DMA 3 Combined Handler
+ DCD GPIO0_Handler ; 68 GPIO 0 Comboned Handler
+ DCD GPIO1_Handler ; 69 GPIO 1 Comboned Handler
+ DCD GPIO2_Handler ; 70 GPIO 2 Comboned Handler
+ DCD GPIO3_Handler ; 71 GPIO 3 Comboned Handler
+ DCD GPIO0_0_Handler ; 72,
+ DCD GPIO0_1_Handler ; 73,
+ DCD GPIO0_2_Handler ; 74,
+ DCD GPIO0_3_Handler ; 75,
+ DCD GPIO0_4_Handler ; 76,
+ DCD GPIO0_5_Handler ; 77,
+ DCD GPIO0_6_Handler ; 78,
+ DCD GPIO0_7_Handler ; 79,
+ DCD GPIO0_8_Handler ; 80,
+ DCD GPIO0_9_Handler ; 81,
+ DCD GPIO0_10_Handler ; 82,
+ DCD GPIO0_11_Handler ; 83,
+ DCD GPIO0_12_Handler ; 84,
+ DCD GPIO0_13_Handler ; 85,
+ DCD GPIO0_14_Handler ; 86,
+ DCD GPIO0_15_Handler ; 87,
+ DCD GPIO1_0_Handler ; 88,
+ DCD GPIO1_1_Handler ; 89,
+ DCD GPIO1_2_Handler ; 90,
+ DCD GPIO1_3_Handler ; 91,
+ DCD GPIO1_4_Handler ; 92,
+ DCD GPIO1_5_Handler ; 93,
+ DCD GPIO1_6_Handler ; 94,
+ DCD GPIO1_7_Handler ; 95,
+__Vectors_End
+
+__Vectors EQU __vector_table
+__Vectors_Size EQU __Vectors_End - __Vectors
+
+; Reset Handler
+
+ PUBWEAK Reset_Handler
+ SECTION .text:CODE:REORDER:NOROOT(2)
+Reset_Handler
+ CPSID i ; Disable IRQs
+ LDR R0, =SystemInit
+ BLX R0
+ LDR R0, =sfe(ARM_LIB_STACK) ; End of PROC_STACK
+ MSR PSP, R0
+ MRS R0, control ; Get control value
+ ORR R0, R0, #2 ; Select switch to PSP
+ MSR control, R0
+ LDR R0, =__iar_program_start
+ BX R0
+
+; Dummy Exception Handlers (infinite loops which can be modified)
+Default_Handler2 MACRO handler_name
+ PUBWEAK handler_name
+handler_name
+ B .
+ ENDM
+
+ Default_Handler2 NMI_Handler
+ Default_Handler2 HardFault_Handler
+ Default_Handler2 MemManage_Handler
+ Default_Handler2 BusFault_Handler
+ Default_Handler2 UsageFault_Handler
+ Default_Handler2 SecureFault_Handler
+ Default_Handler2 SVC_Handler
+ Default_Handler2 DebugMon_Handler
+ Default_Handler2 PendSV_Handler
+ Default_Handler2 SysTick_Handler
+ Default_Handler2 MPC_Handler
+ Default_Handler2 PPC_Handler
+
+Default_Handler
+; Core IoT Interrupts
+ PUBWEAK NONSEC_WATCHDOG_RESET_Handler ; - 0 Non-Secure Watchdog Reset Handler
+ PUBWEAK NONSEC_WATCHDOG_Handler ; - 1 Non-Secure Watchdog Handler
+ PUBWEAK S32K_TIMER_Handler ; - 2 S32K Timer Handler
+ PUBWEAK TFM_TIMER0_IRQ_Handler ; - 3 TIMER 0 Handler
+ PUBWEAK TIMER1_Handler ; - 4 TIMER 1 Handler
+ PUBWEAK DUALTIMER_Handler ; - 5 Dual Timer Handler
+; External Interrupts
+ PUBWEAK UARTRX0_Handler ; 32 UART 0 RX Handler
+ PUBWEAK UARTTX0_Handler ; 33 UART 0 TX Handler
+ PUBWEAK UARTRX1_Handler ; 34 UART 1 RX Handler
+ PUBWEAK UARTTX1_Handler ; 35 UART 1 TX Handler
+ PUBWEAK UARTRX2_Handler ; 36 UART 2 RX Handler
+ PUBWEAK UARTTX2_Handler ; 37 UART 2 TX Handler
+ PUBWEAK UARTRX3_Handler ; 38 UART 3 RX Handler
+ PUBWEAK UARTTX3_Handler ; 39 UART 3 TX Handler
+ PUBWEAK UARTRX4_Handler ; 40 UART 4 RX Handler
+ PUBWEAK UARTTX4_Handler ; 41 UART 4 TX Handler
+ PUBWEAK UART0_Handler ; 42 UART 0 combined Handler
+ PUBWEAK UART1_Handler ; 43 UART 1 combined Handler
+ PUBWEAK UART2_Handler ; 44 UART 2 combined Handler
+ PUBWEAK UART3_Handler ; 45 UART 3 combined Handler
+ PUBWEAK UART4_Handler ; 46 UART 4 combined Handler
+ PUBWEAK UARTOVF_Handler ; 47 UART 0,1,2,3,4 Overflow Handler
+ PUBWEAK ETHERNET_Handler ; 48 Ethernet Handler
+ PUBWEAK I2S_Handler ; 49 I2S Handler
+ PUBWEAK TSC_Handler ; 50 Touch Screen Handler
+ PUBWEAK SPI0_Handler ; 51 SPI 0 Handler
+ PUBWEAK SPI1_Handler ; 52 SPI 1 Handler
+ PUBWEAK SPI2_Handler ; 53 SPI 2 Handler
+ PUBWEAK SPI3_Handler ; 54 SPI 3 Handler
+ PUBWEAK SPI4_Handler ; 55 SPI 4 Handler
+ PUBWEAK DMA0_ERROR_Handler ; 56 DMA 0 Error Handler
+ PUBWEAK DMA0_TC_Handler ; 57 DMA 0 Terminal Count Handler
+ PUBWEAK DMA0_Handler ; 58 DMA 0 Combined Handler
+ PUBWEAK DMA1_ERROR_Handler ; 59 DMA 1 Error Handler
+ PUBWEAK DMA1_TC_Handler ; 60 DMA 1 Terminal Count Handler
+ PUBWEAK DMA1_Handler ; 61 DMA 1 Combined Handler
+ PUBWEAK DMA2_ERROR_Handler ; 62 DMA 2 Error Handler
+ PUBWEAK DMA2_TC_Handler ; 63 DMA 2 Terminal Count Handler
+ PUBWEAK DMA2_Handler ; 64 DMA 2 Combined Handler
+ PUBWEAK DMA3_ERROR_Handler ; 65 DMA 3 Error Handler
+ PUBWEAK DMA3_TC_Handler ; 66 DMA 3 Terminal Count Handler
+ PUBWEAK DMA3_Handler ; 67 DMA 3 Combined Handler
+ PUBWEAK GPIO0_Handler ; 68 GPIO 0 Comboned Handler
+ PUBWEAK GPIO1_Handler ; 69 GPIO 1 Comboned Handler
+ PUBWEAK GPIO2_Handler ; 70 GPIO 2 Comboned Handler
+ PUBWEAK GPIO3_Handler ; 71 GPIO 3 Comboned Handler
+ PUBWEAK GPIO0_0_Handler ; 72 GPIO 1 has 16 individual Handlers
+ PUBWEAK GPIO0_1_Handler ; 73
+ PUBWEAK GPIO0_2_Handler ; 74
+ PUBWEAK GPIO0_3_Handler ; 75
+ PUBWEAK GPIO0_4_Handler ; 76
+ PUBWEAK GPIO0_5_Handler ; 77
+ PUBWEAK GPIO0_6_Handler ; 78
+ PUBWEAK GPIO0_7_Handler ; 79
+ PUBWEAK GPIO0_8_Handler ; 80
+ PUBWEAK GPIO0_9_Handler ; 81
+ PUBWEAK GPIO0_10_Handler ; 82
+ PUBWEAK GPIO0_11_Handler ; 83
+ PUBWEAK GPIO0_12_Handler ; 84
+ PUBWEAK GPIO0_13_Handler ; 85
+ PUBWEAK GPIO0_14_Handler ; 86
+ PUBWEAK GPIO0_15_Handler ; 87
+ PUBWEAK GPIO1_0_Handler ; 88 GPIO 1 has 8 individual Handlers
+ PUBWEAK GPIO1_1_Handler ; 89
+ PUBWEAK GPIO1_2_Handler ; 90
+ PUBWEAK GPIO1_3_Handler ; 91
+ PUBWEAK GPIO1_4_Handler ; 92
+ PUBWEAK GPIO1_5_Handler ; 93
+ PUBWEAK GPIO1_6_Handler ; 94
+ PUBWEAK GPIO1_7_Handler ; 95
+
+; Core IoT Interrupts
+NONSEC_WATCHDOG_RESET_Handler ; - 0 Non-Secure Watchdog Reset Handler
+NONSEC_WATCHDOG_Handler ; - 1 Non-Secure Watchdog Handler
+S32K_TIMER_Handler ; - 2 S32K Timer Handler
+TFM_TIMER0_IRQ_Handler ; - 3 TIMER 0 Handler
+TIMER1_Handler ; - 4 TIMER 1 Handler
+DUALTIMER_Handler ; - 5 Dual Timer Handler
+; External Interrupts
+UARTRX0_Handler ; 32 UART 0 RX Handler
+UARTTX0_Handler ; 33 UART 0 TX Handler
+UARTRX1_Handler ; 34 UART 1 RX Handler
+UARTTX1_Handler ; 35 UART 1 TX Handler
+UARTRX2_Handler ; 36 UART 2 RX Handler
+UARTTX2_Handler ; 37 UART 2 TX Handler
+UARTRX3_Handler ; 38 UART 3 RX Handler
+UARTTX3_Handler ; 39 UART 3 TX Handler
+UARTRX4_Handler ; 40 UART 4 RX Handler
+UARTTX4_Handler ; 41 UART 4 TX Handler
+UART0_Handler ; 42 UART 0 combined Handler
+UART1_Handler ; 43 UART 1 combined Handler
+UART2_Handler ; 44 UART 2 combined Handler
+UART3_Handler ; 45 UART 3 combined Handler
+UART4_Handler ; 46 UART 4 combined Handler
+UARTOVF_Handler ; 47 UART 0,1,2,3,4 Overflow Handler
+ETHERNET_Handler ; 48 Ethernet Handler
+I2S_Handler ; 49 I2S Handler
+TSC_Handler ; 50 Touch Screen Handler
+SPI0_Handler ; 51 SPI 0 Handler
+SPI1_Handler ; 52 SPI 1 Handler
+SPI2_Handler ; 53 SPI 2 Handler
+SPI3_Handler ; 54 SPI 3 Handler
+SPI4_Handler ; 55 SPI 4 Handler
+DMA0_ERROR_Handler ; 56 DMA 0 Error Handler
+DMA0_TC_Handler ; 57 DMA 0 Terminal Count Handler
+DMA0_Handler ; 58 DMA 0 Combined Handler
+DMA1_ERROR_Handler ; 59 DMA 1 Error Handler
+DMA1_TC_Handler ; 60 DMA 1 Terminal Count Handler
+DMA1_Handler ; 61 DMA 1 Combined Handler
+DMA2_ERROR_Handler ; 62 DMA 2 Error Handler
+DMA2_TC_Handler ; 63 DMA 2 Terminal Count Handler
+DMA2_Handler ; 64 DMA 2 Combined Handler
+DMA3_ERROR_Handler ; 65 DMA 3 Error Handler
+DMA3_TC_Handler ; 66 DMA 3 Terminal Count Handler
+DMA3_Handler ; 67 DMA 3 Combined Handler
+GPIO0_Handler ; 68 GPIO 0 Comboned Handler
+GPIO1_Handler ; 69 GPIO 1 Comboned Handler
+GPIO2_Handler ; 70 GPIO 2 Comboned Handler
+GPIO3_Handler ; 71 GPIO 3 Comboned Handler
+GPIO0_0_Handler ; 72 GPIO 0 has 16 individual Handlers
+GPIO0_1_Handler ; 73
+GPIO0_2_Handler ; 74
+GPIO0_3_Handler ; 75
+GPIO0_4_Handler ; 76
+GPIO0_5_Handler ; 77
+GPIO0_6_Handler ; 78
+GPIO0_7_Handler ; 79
+GPIO0_8_Handler ; 80
+GPIO0_9_Handler ; 81
+GPIO0_10_Handler ; 82
+GPIO0_11_Handler ; 83
+GPIO0_12_Handler ; 84
+GPIO0_13_Handler ; 85
+GPIO0_14_Handler ; 86
+GPIO0_15_Handler ; 87
+GPIO1_0_Handler ; 88 GPIO 1 has 8 individual Handlers
+GPIO1_1_Handler ; 89
+GPIO1_2_Handler ; 90
+GPIO1_3_Handler ; 91
+GPIO1_4_Handler ; 92
+GPIO1_5_Handler ; 93
+GPIO1_6_Handler ; 94
+GPIO1_7_Handler ; 95
+ B .
+
+ END