diff --git a/drivers/bl702_driver/bl702_ram.ld b/drivers/bl702_driver/bl702_ram.ld
index c458277f..00e79d9d 100644
--- a/drivers/bl702_driver/bl702_ram.ld
+++ b/drivers/bl702_driver/bl702_ram.ld
@@ -1,9 +1,9 @@
 /****************************************************************************************
-* @file map.txt
+* @file bl702_ram.ld
 *
 * @brief This file is the map file (gnuarm or armgcc).
 *
-* Copyright (C) BouffaloLab 2018
+* Copyright (C) BouffaloLab 2021
 *
 ****************************************************************************************
 */
@@ -18,7 +18,6 @@ OUTPUT_ARCH( "riscv" )
 ENTRY(_enter)
 
 StackSize = 0x0400; /*  1KB */
-HeapSize  = 0x1000; /*  4KB */
 
 MEMORY
 {
@@ -82,22 +81,6 @@ SECTIONS
         __tcm_data_end__ = .;
     } > dtcm_memory
 
-    /* .heap_dummy section doesn't contains any symbols. It is only
-     * used for linker to calculate size of heap sections, and assign
-     * values to heap symbols later */
-    .heap_dummy (NOLOAD):
-    {
-        . = ALIGN(0x4);
-        . = . + HeapSize;
-        . = ALIGN(0x4);
-    } > dtcm_memory
-
-    _HeapBase = ORIGIN(dtcm_memory) + LENGTH(dtcm_memory) - StackSize - HeapSize;
-    _HeapSize = HeapSize;
-
-    /* Check if data + heap + stack exceeds RAM limit */
-    ASSERT(_HeapBase >= __tcm_data_end__, "region RAM overflowed with stack")
-
     /*************************************************************************/
     /* .stack_dummy section doesn't contains any symbols. It is only
      * used for linker to calculate size of stack sections, and assign
@@ -189,5 +172,10 @@ SECTIONS
         __HeapLimit = .;
     } > ram_memory
 
+    PROVIDE (__heap_min_size = 0x400);
+    __HeapLimit = ORIGIN(ram_memory) + LENGTH(ram_memory);
+
+    ASSERT((__HeapLimit -  __HeapBase ) >= __heap_min_size, "heap size is too short.")
+
 }
 
diff --git a/drivers/bl702_driver/cpu_flags.cmake b/drivers/bl702_driver/cpu_flags.cmake
index bc9c1e9c..484d5b28 100644
--- a/drivers/bl702_driver/cpu_flags.cmake
+++ b/drivers/bl702_driver/cpu_flags.cmake
@@ -7,4 +7,5 @@ list(APPEND GLOBAL_C_FLAGS -march=${MARCH} -mabi=${MABI})
 list(APPEND GLOBAL_LD_FLAGS -march=${MARCH} -mabi=${MABI})
 
 SET(LINKER_SCRIPT ${CMAKE_CURRENT_LIST_DIR}/bl702_flash.ld)
+SET(RAM_LINKER_SCRIPT ${CMAKE_CURRENT_LIST_DIR}/bl702_ram.ld)
 SET(BOOT2_LINKER_SCRIPT ${CMAKE_CURRENT_LIST_DIR}/blsp_boot2_iap_flash.ld)
\ No newline at end of file