diff --git a/port/threadx_smp/src/tx_initialize_low_level.S b/port/threadx_smp/src/tx_initialize_low_level.S
new file mode 100644
index 0000000..0602ea9
--- /dev/null
+++ b/port/threadx_smp/src/tx_initialize_low_level.S
@@ -0,0 +1,84 @@
+/***************************************************************************
+ * Copyright (c) 2024 Microsoft Corporation 
+ * 
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License which is available at
+ * https://opensource.org/licenses/MIT.
+ * 
+ * SPDX-License-Identifier: MIT
+ **************************************************************************/
+
+#include "csr.h"
+#include "tx_port.h"
+    .section .text
+/**************************************************************************/
+/*                                                                        */
+/*  FUNCTION                                               RELEASE        */
+/*                                                                        */
+/*    _tx_initialize_low_level                           RISC-V64/GNU     */
+/*                                                           6.2.1        */
+/*  AUTHOR                                                                */
+/*                                                                        */
+/*    Scott Larson, Microsoft Corporation                                 */
+/*                                                                        */
+/*  DESCRIPTION                                                           */
+/*                                                                        */
+/*    This function is responsible for any low-level processor            */
+/*    initialization, including setting up interrupt vectors, setting     */
+/*    up a periodic timer interrupt source, saving the system stack       */
+/*    pointer for use in ISR processing later, and finding the first      */
+/*    available RAM memory address for tx_application_define.             */
+/*                                                                        */
+/*  INPUT                                                                 */
+/*                                                                        */
+/*    None                                                                */
+/*                                                                        */
+/*  OUTPUT                                                                */
+/*                                                                        */
+/*    None                                                                */
+/*                                                                        */
+/*  CALLS                                                                 */
+/*                                                                        */
+/*    None                                                                */
+/*                                                                        */
+/*  CALLED BY                                                             */
+/*                                                                        */
+/*    _tx_initialize_kernel_enter           ThreadX entry function        */
+/*                                                                        */
+/*  RELEASE HISTORY                                                       */
+/*                                                                        */
+/*    DATE              NAME                      DESCRIPTION             */
+/*                                                                        */
+/*  03-08-2023      Scott Larson            Initial Version 6.2.1         */
+/*                                                                        */
+/**************************************************************************/
+/* VOID   _tx_initialize_low_level(VOID)
+*/
+    .global  _tx_initialize_low_level
+    .weak    _tx_initialize_low_level
+    .extern  __heap_start
+    .extern  board_init
+_tx_initialize_low_level:
+    STORE      sp, _tx_thread_system_stack_ptr, t0      // Save system stack pointer
+
+    la      t0, __heap_start            		        // Pickup first free address
+    STORE      t0, _tx_initialize_unused_memory, t1     // Save unused memory address
+    li      t0, MSTATUS_MIE
+    csrrc   zero, mstatus, t0			                // clear MSTATUS_MIE bit
+    li 	    t0, (MSTATUS_MPP_M | MSTATUS_MPIE )
+    csrrs   zero, mstatus, t0			                // set MSTATUS_MPP, MPIE bit
+    li	    t0, (MIE_MTIE | MIE_MSIE | MIE_MEIE)
+    csrrs   zero, mie, t0			                    // set mie
+#ifdef __riscv_flen
+    li      t0, MSTATUS_FS
+    csrrs   zero, mstatus, t0			                // set MSTATUS_FS bit to open f/d isa in riscv
+    fscsr   x0
+#endif
+    addi    sp, sp, -8
+    STORE	    ra, 0(sp)
+    call    board_init
+    LOAD	    ra, 0(sp)
+    addi    sp, sp, 8
+    la	    t0, trap_entry
+    csrw    mtvec, t0
+    ret
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