--- /dev/null
+/******************************************************************************
+*
+* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+*
+* Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+*
+* Redistributions in binary form must reproduce the above copyright
+* notice, this list of conditions and the following disclaimer in the
+* documentation and/or other materials provided with the
+* distribution.
+*
+* Neither the name of Texas Instruments Incorporated nor the names of
+* its contributors may be used to endorse or promote products derived
+* from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+******************************************************************************/
+
+#include <stdint.h>
+
+/******************************************************************************
+*
+* The entry point for the application startup code.
+*
+******************************************************************************/
+extern int main(void);
+
+/******************************************************************************
+*
+* Reserve space for the system stack.
+*
+******************************************************************************/
+__attribute__ ((section(".stack")))
+static uint32_t stack[100];
+const uint32_t stack_pntr = (uint32_t)stack + sizeof(stack);
+
+/******************************************************************************
+*
+* The following are constructs created by the linker indicating where the
+* the "bss" and "ebss" segments reside in memory.
+*
+******************************************************************************/
+extern uint32_t _bss;
+extern uint32_t _ebss;
+
+/******************************************************************************
+*
+* This is the entry point that handles setting the stack within the allowed
+* workspace, initializing the .bss segment, and then jumping to main.
+*
+******************************************************************************/
+__attribute__ ((section(".entry")))
+void entry(void)
+{
+ /* Workaround for ITT instructions. */
+ __asm(" NOP");
+ __asm(" NOP");
+ __asm(" NOP");
+ __asm(" NOP");
+
+ /* Initialize stack pointer */
+ __asm(" ldr sp, =stack_pntr");
+
+ /* Zero fill the bss segment. */
+ __asm(" ldr r0, =_bss\n"
+ " ldr r1, =_ebss\n"
+ " mov r2, #0\n"
+ " .thumb_func\n"
+ " zero_loop:\n"
+ " cmp r0, r1\n"
+ " it lt\n"
+ " strlt r2, [r0], #4\n"
+ " blt zero_loop");
+
+ /* Call the application's entry point. */
+ main();
+
+ /* If we ever return, enter an infinite loop */
+ while (1)
+ ;
+}