[ublox] Support boot stack size configuration option

targets/TARGET_ublox/TARGET_HI2110/device/TOOLCHAIN_ARM_STD/hi2110.sct

@@ -1,3 +1,11 @@
+#! armcc -E
+
+#if !defined(MBED_BOOT_STACK_SIZE)
+  #define MBED_BOOT_STACK_SIZE 0x400
+#endif
+
+#define Stack_Size MBED_BOOT_STACK_SIZE
+
 LR_IROM1 0x00000000 0x20000 {
   ER_IROM1 0x00000000 0x20000  {
    *.o (RESET, +First)
@@ -6,10 +14,12 @@ LR_IROM1 0x00000000 0x20000 {
   }
   RW_IRAM_VTABLE 0x01000000 EMPTY 128  {
   }
-  RW_IRAM1 +0 (0x5000 - 256)  {
+  RW_IRAM1 +0 (0x5000 - 256 - Stack_Size)  {
    .ANY (+RW +ZI)
   }
   RW_IPCRAM +0 256 {
    ipc.o (+RW)
   }
+  ARM_LIB_STACK (0x01000000+0x5000) EMPTY -Stack_Size { ; stack
+  }
 }

targets/TARGET_ublox/TARGET_HI2110/device/TOOLCHAIN_GCC_ARM/hi2110.ld

@@ -4,6 +4,13 @@
 OUTPUT_FORMAT("elf32-littlearm")
 OUTPUT_ARCH(arm)
 ENTRY(Reset_Handler)
+
+#if !defined(MBED_BOOT_STACK_SIZE)
+    #define MBED_BOOT_STACK_SIZE 0x400
+#endif
+
+STACK_SIZE = MBED_BOOT_STACK_SIZE;
+
 MEMORY
 {
     FLASH_VECTORS : ORIGIN = 0, LENGTH = 192
@@ -151,7 +158,7 @@ SECTIONS
     /* Set stack top to end of RAM, and stack limit move down by
      * size of stack_dummy section */
     __StackTop = ORIGIN(RAM) + LENGTH(RAM); /* Remember that LENGTH(RAM) is already reduced by the IPC block */
-    __StackLimit = __StackTop - SIZEOF(.stack_dummy);
+    __StackLimit = __StackTop - STACK_SIZE;
     PROVIDE(__stack = __StackTop);
 
     /* Check if data + heap + stack exceeds RAM limit */

targets/TARGET_ublox/TARGET_HI2110/device/TOOLCHAIN_IAR/hi2110.icf

@@ -8,10 +8,14 @@ define symbol __size_flash_vtable__ = 192;
 define symbol __size_ram_vtable__   = 128;  /* Reserve space for dynamic vectors mapped to RAM (see cmsis_nvic.c) */
 define symbol __size_ipc__          = 256;
 
+if (!isdefinedsymbol(MBED_BOOT_STACK_SIZE)) {
+    define symbol MBED_BOOT_STACK_SIZE = 0x400;
+}
+
 if (isdefinedsymbol(__stack_size__)) {
   define symbol __size_cstack__        = __stack_size__;
 } else {
-  define symbol __size_cstack__        = 1024;
+  define symbol __size_cstack__        = MBED_BOOT_STACK_SIZE;
 }
 
 if (isdefinedsymbol(__heap_size__)) {