Rework initialization and interrupt stack support

Statically initialize the interrupt stack area
(_Configuration_Interrupt_stack_area_begin,
_Configuration_Interrupt_stack_area_end, and
_Configuration_Interrupt_stack_size) via <rtems/confdefs.h>.  Place the
interrupt stack area in a special section ".rtemsstack.interrupt".  Let
BSPs define the optimal placement of this section in their linker
command files (e.g. in a fast on-chip memory).

This change makes makes the CPU_HAS_SOFTWARE_INTERRUPT_STACK and
CPU_HAS_HARDWARE_INTERRUPT_STACK CPU port defines superfluous, since the
low level initialization code has all information available via global
symbols.

This change makes the CPU_ALLOCATE_INTERRUPT_STACK CPU port define
superfluous, since the interrupt stacks are allocated by confdefs.h for
all architectures.  There is no need for BSP-specific linker command
file magic (except the section placement), see previous ARM linker
command file as a bad example.

Remove _CPU_Install_interrupt_stack().  Initialize the hardware
interrupt stack in _CPU_Initialize() if necessary (e.g.
m68k_install_interrupt_stack()).

The optional _CPU_Interrupt_stack_setup() is still useful to customize
the registration of the interrupt stack area in the per-CPU information.

The initialization stack can reuse the interrupt stack, since

  * interrupts are disabled during the sequential system initialization,
    and

  * the boot_card() function does not return.

This stack resuse saves memory.

Changes per architecture:

arm:

  * Mostly replace the linker symbol based configuration of stacks with
    the standard <rtems/confdefs.h> configuration via
    CONFIGURE_INTERRUPT_STACK_SIZE.  The size of the FIQ, ABT and UND
    mode stack is still defined via linker symbols.  These modes are
    rarely used in applications and the default values provided by the
    BSP should be sufficient in most cases.

  * Remove the bsp_processor_count linker symbol hack used for the SMP
    support. This is possible since the interrupt stack area is now
    allocated by the linker and not allocated from the heap.  This makes
    some configure.ac stuff obsolete.  Remove the now superfluous BSP
    variants altcycv_devkit_smp and realview_pbx_a9_qemu_smp.

bfin:

  * Remove unused magic linker command file allocation of initialization
    stack.  Maybe a previous linker command file copy and paste problem?
    In the start.S the initialization stack is set to a hard coded value.

lm32, m32c, mips, nios2, riscv, sh, v850:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

m68k:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

powerpc:

  * Remove magic linker command file allocation of initialization stack.
    Reuse interrupt stack for initialization stack.

  * Used dedicated memory region (REGION_RTEMSSTACK) for the interrupt
    stack on BSPs using the shared linkcmds.base (replacement for
    REGION_RWEXTRA).

sparc:

  * Remove the hard coded initialization stack.  Use the interrupt stack
    for the initialization stack on the boot processor.  This saves
    16KiB of RAM.

Update #3459.

21 files changed, 20 insertions, 118 deletions

diff --git a/bsps/m68k/gen68340/start/linkcmds b/bsps/m68k/gen68340/start/linkcmds
index 99eeb3bf70..3621474fe8 100644
--- a/bsps/m68k/gen68340/start/linkcmds
+++ b/bsps/m68k/gen68340/start/linkcmds
@@ -21,7 +21,6 @@
 RamBase = DEFINED(RamBase) ? RamBase : 0x10000000;
 RamSize = DEFINED(RamSize) ? RamSize : 4M;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x1000;
 
 /*
  * Declare on-board memory.
@@ -186,10 +185,6 @@ SECTIONS {
                 *(COMMON)
                 . = ALIGN (16);
                 PROVIDE (end = .);
-
-                . += _StackSize;
-                . = ALIGN (16);
-                _stack_init = .;
                 _clear_end = .;
         } >ram
 
diff --git a/bsps/m68k/gen68340/start/start.S b/bsps/m68k/gen68340/start/start.S
index 794c6d75b6..85b9aa86fa 100644
--- a/bsps/m68k/gen68340/start/start.S
+++ b/bsps/m68k/gen68340/start/start.S
@@ -850,7 +850,7 @@ ZEROLOOPTEST:
 	cmpl	a1,a0						| Done?
 	bcs.s	ZEROLOOP					| No, skip
 
-	movel	#_stack_init,a7					| set master stack pointer
+	movel	#_Configuration_Interrupt_stack_area_end,a7		| set master stack pointer
 	movel	d0,a7@-						| command line
 	jsr	SYM(boot_card)					| Call C main
 
diff --git a/bsps/m68k/gen68360/start/linkcmds b/bsps/m68k/gen68360/start/linkcmds
index f3d6712988..f2858137d7 100644
--- a/bsps/m68k/gen68360/start/linkcmds
+++ b/bsps/m68k/gen68360/start/linkcmds
@@ -16,7 +16,6 @@
 RamBase = DEFINED(RamBase) ? RamBase : 0x0;
 RamSize = DEFINED(RamSize) ? RamSize : 64M;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x1000;
 
 /*
  * Declare on-board memory.
@@ -150,10 +149,6 @@ SECTIONS {
                 *(COMMON)
                 . = ALIGN (16);
                 PROVIDE (end = .);
-
-                . += _StackSize;
-                . = ALIGN (16);
-                _stack_init = .;
                 _clear_end = .;
         } >ram
 
diff --git a/bsps/m68k/gen68360/start/linkcmds.bootp b/bsps/m68k/gen68360/start/linkcmds.bootp
index b97c66f3a1..a05573cb2c 100644
--- a/bsps/m68k/gen68360/start/linkcmds.bootp
+++ b/bsps/m68k/gen68360/start/linkcmds.bootp
@@ -20,7 +20,6 @@
 RamBase = DEFINED(RamBase) ? RamBase : 0x0;
 RamSize = DEFINED(RamSize) ? RamSize : 64M;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x1000;
 
 /*
  * Declare on-board memory.
@@ -152,10 +151,6 @@ SECTIONS {
                 *(COMMON)
                 . = ALIGN (16);
                 PROVIDE (end = .);
-
-                . += _StackSize;
-                . = ALIGN (16);
-                _stack_init = .;
                 _clear_end = .;
         } >myram
 
diff --git a/bsps/m68k/gen68360/start/linkcmds.prom b/bsps/m68k/gen68360/start/linkcmds.prom
index 6513ccd544..0e68300de7 100644
--- a/bsps/m68k/gen68360/start/linkcmds.prom
+++ b/bsps/m68k/gen68360/start/linkcmds.prom
@@ -20,7 +20,6 @@
 RamBase = DEFINED(RamBase) ? RamBase : 0x0;
 RamSize = DEFINED(RamSize) ? RamSize : 64M;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x1000;
 
 /*
  * Declare on-board memory.
@@ -150,10 +149,6 @@ SECTIONS {
                 *(COMMON)
                 . = ALIGN (16);
                 PROVIDE (end = .);
-
-                . += _StackSize;
-                . = ALIGN (16);
-                _stack_init = .;
                 _clear_end = .;
         } >ram
 
diff --git a/bsps/m68k/gen68360/start/start.S b/bsps/m68k/gen68360/start/start.S
index 8511960e16..7549f08af8 100644
--- a/bsps/m68k/gen68360/start/start.S
+++ b/bsps/m68k/gen68360/start/start.S
@@ -390,7 +390,7 @@ ZEROLOOPTEST:
 	cmpl	a1,a0			| Done?
 	bcs.s	ZEROLOOP		| No, skip
 
-	movel	#_stack_init,a7		| set master stack pointer
+	movel	#_Configuration_Interrupt_stack_area_end,a7 | set master stack pointer
 	movel	d0,a7@-			| command line
 	jsr	boot_card		| Call C main
 
diff --git a/bsps/m68k/genmcf548x/start/linkcmds.COBRA5475 b/bsps/m68k/genmcf548x/start/linkcmds.COBRA5475
index 52bca8d018..1e817d01ee 100644
--- a/bsps/m68k/genmcf548x/start/linkcmds.COBRA5475
+++ b/bsps/m68k/genmcf548x/start/linkcmds.COBRA5475
@@ -62,8 +62,6 @@ _CoreSramSize1  = DEFINED(_CoreSramSize1)  ? _CoreSramSize1 : (4 * 1024);
 _BootFlashBase  = DEFINED(_BootFlashBase)  ? _BootFlashBase : 0xFC000000;
 _BootFlashSize  = DEFINED(_BootFlashSize)  ? _BootFlashSize : (32 * 1024*1024);
 
-bsp_initstack_size = DEFINED(StackSize)    ? StackSize  : 0x800;  /* 2 kB   */
-
 _VBR            = DEFINED(_VBR)            ? _VBR       : _SdramBase;
 
 __MBAR          = DEFINED(__MBAR)          ? __MBAR     : 0xFE000000;
diff --git a/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine b/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine
index be746af7ff..ee873c4681 100644
--- a/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine
+++ b/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine
@@ -63,8 +63,6 @@ _BootFlashSize  = DEFINED(_BootFlashSize)  ? _BootFlashSize : (2 * 1024*1024);
 _CodeFlashBase  = DEFINED(_CodeFlashBase)  ? _CodeFlashBase : 0xE0000000;
 _CodeFlashSize  = DEFINED(_CodeFlashSize)  ? _CodeFlashSize : (16 * 1024*1024);
 
-bsp_initstack_size = DEFINED(StackSize)    ? StackSize  : 0x800;  /* 2 kB   */
-
 _VBR            = DEFINED(_VBR)            ? _VBR       : _SdramBase;
 
 __MBAR          = DEFINED(__MBAR)          ? __MBAR     : 0x10000000;
diff --git a/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine.flash b/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine.flash
index 4db960f111..30df1e4bd7 100644
--- a/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine.flash
+++ b/bsps/m68k/genmcf548x/start/linkcmds.m5484FireEngine.flash
@@ -63,8 +63,6 @@ _BootFlashSize = DEFINED(_BootFlashSize)  ? _BootFlashSize : (2 * 1024 * 1024);
 _CodeFlashBase = DEFINED(_CodeFlashBase)  ? _CodeFlashBase : 0xE0000000;
 _CodeFlashSize = DEFINED(_CodeFlashSize)  ? _CodeFlashSize : (16 * 1024 * 1024);
 
-bsp_initstack_size = DEFINED(StackSize)    ? StackSize  : 0x800;  /* 2 kB   */
-
 _VBR            = DEFINED(_VBR)            ? _VBR       : _SdramBase;
 
 __MBAR          = DEFINED(__MBAR)          ? __MBAR     : 0x10000000;
diff --git a/bsps/m68k/genmcf548x/start/start.S b/bsps/m68k/genmcf548x/start/start.S
index d4d1d9b273..1bc09a0118 100644
--- a/bsps/m68k/genmcf548x/start/start.S
+++ b/bsps/m68k/genmcf548x/start/start.S
@@ -75,7 +75,7 @@
 .section ".vectors","ax"  	     /* begin of vectors section */
 PUBLIC (InterruptVectorTable)
 SYM(InterruptVectorTable):
-INITSP:		.long	bsp_initstack_end	/* Initial SP		  */
+INITSP:		.long	_Configuration_Interrupt_stack_area_end /* Initial SP		  */
 INITPC:		.long	start			/* Initial PC		  */
 vector002:	.long	asm_default_interrupt	/* Access Error		  */
 vector003:	.long	asm_default_interrupt	/* Address Error	  */
@@ -411,7 +411,7 @@ SYM(start_init):
 
     jsr	    mcf548x_init		/* Initialize mcf548x peripherals */
 
-    move.l  #bsp_initstack_end,sp	/* relocate sp */
+    move.l  #_Configuration_Interrupt_stack_area_end,sp /* relocate sp */
 
     clrl    d0          		/* clear d0 */
     movel   d0,a7@-                     /* command line == 0 */
diff --git a/bsps/m68k/mcf52235/start/linkcmds b/bsps/m68k/mcf52235/start/linkcmds
index 3e912a210f..0c4d15fe08 100644
--- a/bsps/m68k/mcf52235/start/linkcmds
+++ b/bsps/m68k/mcf52235/start/linkcmds
@@ -16,7 +16,6 @@
 RamBase = DEFINED(RamBase) ? RamBase : 0x20000000;
 RamSize = DEFINED(RamSize) ? RamSize : 32K;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x400;
 _FlashBase = DEFINED(_FlashBase) ? _FlashBase : 0x00000000;
 
 _VBR = 0x20000000;
@@ -171,16 +170,6 @@ SECTIONS
         PROVIDE (_clear_end = .);
     } >sram
 
-    .stack : 
-    {
-        /*
-         * Starting Stack
-         */ 
-        . += _StackSize;
-        . = ALIGN (16);
-        PROVIDE(_StackInit = .);
-    } >sram
-
     .rtemsstack (NOLOAD) : {
         *(SORT(.rtemsstack.*))
         PROVIDE(WorkAreaBase = .);
diff --git a/bsps/m68k/mcf52235/start/start.S b/bsps/m68k/mcf52235/start/start.S
index e1d837cab5..ecb2c5c980 100644
--- a/bsps/m68k/mcf52235/start/start.S
+++ b/bsps/m68k/mcf52235/start/start.S
@@ -16,14 +16,12 @@
 
 #include <rtems/asm.h>
 
-.extern _StackInit
-
 BEGIN_CODE
 
     PUBLIC (_INTERRUPT_VECTOR)
 SYM(_INTERRUPT_VECTOR):
 
-    .long   _StackInit /* 00 Initial 'SSP' */
+    .long   _Configuration_Interrupt_stack_area_end /* 00 Initial 'SSP' */
     .long   SYM(start) /* 01 Initial PC */
     .long   SYM(_uhoh) /* 02 Access Error */
     .long   SYM(_uhoh) /* 03 Address Error */
@@ -357,7 +355,7 @@ SYM(start):
     movec   d0, %rambar
 
     /* Locate Stack Pointer */
-    move.l  #_StackInit, sp
+    move.l  #_Configuration_Interrupt_stack_area_end, sp
 
     /* Initialize FLASHBAR */
     move.l  #_FlashBase, d0
@@ -369,7 +367,7 @@ SYM(start):
 _continue_startup:
 
     /* Locate Stack Pointer */
-    move.l  #_StackInit, sp
+    move.l  #_Configuration_Interrupt_stack_area_end, sp
 
     /* Save off intial D0 and D1 to RAM */
     move.l  d6, SYM(_d0_reset)
diff --git a/bsps/m68k/mcf5225x/start/linkcmds b/bsps/m68k/mcf5225x/start/linkcmds
index a2ad1ec047..563aede8eb 100644
--- a/bsps/m68k/mcf5225x/start/linkcmds
+++ b/bsps/m68k/mcf5225x/start/linkcmds
@@ -16,7 +16,6 @@
 RamBase = DEFINED(RamBase) ? RamBase : 0x20000000;
 RamSize = DEFINED(RamSize) ? RamSize : 64K;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x400;
 _FlashBase = DEFINED(_FlashBase) ? _FlashBase : 0x00000000;
 
 _VBR = 0x20000000;
@@ -171,16 +170,6 @@ SECTIONS
         PROVIDE (_clear_end = .);
     } >sram
 
-    .stack : 
-    {
-        /*
-         * Starting Stack
-         */ 
-        . += _StackSize;
-        . = ALIGN (16);
-        PROVIDE(_StackInit = .);
-    } >sram
-
     .rtemsstack (NOLOAD) : {
         *(SORT(.rtemsstack.*))
         PROVIDE(WorkAreaBase = .);
diff --git a/bsps/m68k/mcf5225x/start/start.S b/bsps/m68k/mcf5225x/start/start.S
index abc7bb99cc..19d9038431 100644
--- a/bsps/m68k/mcf5225x/start/start.S
+++ b/bsps/m68k/mcf5225x/start/start.S
@@ -16,14 +16,12 @@
 
 #include <rtems/asm.h>
 
-.extern _StackInit
-
 BEGIN_CODE
     
     PUBLIC (_INTERRUPT_VECTOR)
 SYM(_INTERRUPT_VECTOR):
 
-    .long   _StackInit /* 00 Initial 'SSP' */
+    .long   _Configuration_Interrupt_stack_area_end /* 00 Initial 'SSP' */
     .long   SYM(start) /* 01 Initial PC */
     .long   SYM(_uhoh) /* 02 Access Error */
     .long   SYM(_uhoh) /* 03 Address Error */
@@ -361,7 +359,7 @@ SYM(start):
     movec   d7, %rambar
 
     /* Locate Stack Pointer */ 
-    move.l  #_StackInit, sp
+    move.l  #_Configuration_Interrupt_stack_area_end, sp
 
     /* Initialize FLASHBAR */
     move.l  #_FlashBase, d7
@@ -373,7 +371,7 @@ SYM(start):
 _continue_startup:
 
     /* Locate Stack Pointer */ 
-//    move.l  #_StackInit, sp		//is done automatically by the CPU
+//    move.l  #_Configuration_Interrupt_stack_area_end, sp		//is done automatically by the CPU
 
     /*
      * Remainder of the startup code is handled by C code
diff --git a/bsps/m68k/mcf5329/start/linkcmds b/bsps/m68k/mcf5329/start/linkcmds
index bed8dfe0fe..78fc50c22a 100644
--- a/bsps/m68k/mcf5329/start/linkcmds
+++ b/bsps/m68k/mcf5329/start/linkcmds
@@ -23,7 +23,6 @@ _BootFlashBase = DEFINED(_FlashBase) ? _FlashBase : 0x00000000;
 _BootFlashSize = DEFINED(_FlashBase) ? _FlashBase : 2M;
 
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x400;
 
 _VBR = 0x40000000;
 
@@ -178,23 +177,12 @@ SECTIONS
         *(COMMON)
         . = ALIGN (16);
         PROVIDE (_end = .);
-
         _clear_end = .;
+        WorkAreaBase = .;
     } > dram
 
     .rtemsstack (NOLOAD) : {
         *(SORT(.rtemsstack.*))
-        WorkAreaBase = .;
-    } > dram
-
-    .start_stack :
-    {
-        /*
-         * Starting Stack
-         */ 
-        . += _StackSize;
-        . = ALIGN (16);
-        PROVIDE(_StackInit = .);
     } > core_sram
 
     /* Stabs debugging sections.  */
diff --git a/bsps/m68k/mcf5329/start/linkcmdsflash b/bsps/m68k/mcf5329/start/linkcmdsflash
index 88a6f96ff0..adfb3bacfb 100644
--- a/bsps/m68k/mcf5329/start/linkcmdsflash
+++ b/bsps/m68k/mcf5329/start/linkcmdsflash
@@ -23,7 +23,6 @@ _BootFlashBase = DEFINED(_FlashBase) ? _FlashBase : 0x00000000;
 _BootFlashSize = DEFINED(_FlashBase) ? _FlashBase : 2M;
 
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x400;
 
 _VBR = 0x40000000;
 
@@ -174,23 +173,12 @@ SECTIONS
         *(COMMON)
         . = ALIGN (16);
         PROVIDE (_end = .);
-
         _clear_end = .;
+        WorkAreaBase = .;
     } > dram
 
     .rtemsstack (NOLOAD) : {
         *(SORT(.rtemsstack.*))
-        WorkAreaBase = .;
-    } > dram
-
-    .start_stack :
-    {
-        /*
-         * Starting Stack
-         */ 
-        . += _StackSize;
-        . = ALIGN (16);
-        PROVIDE(_StackInit = .);
     } > core_sram
 
     /* Stabs debugging sections.  */
diff --git a/bsps/m68k/mcf5329/start/start.S b/bsps/m68k/mcf5329/start/start.S
index 6063fdac74..659c617272 100644
--- a/bsps/m68k/mcf5329/start/start.S
+++ b/bsps/m68k/mcf5329/start/start.S
@@ -16,14 +16,12 @@
 
 #include <rtems/asm.h>
 
-.extern _StackInit
-
 BEGIN_CODE
 
     PUBLIC (_INTERRUPT_VECTOR)
 SYM(_INTERRUPT_VECTOR):
 
-    .long   _StackInit /* 00 Initial 'SSP' */
+    .long   _Configuration_Interrupt_stack_area_end /* 00 Initial 'SSP' */
     .long   SYM(start) /* 01 Initial PC */
     .long   SYM(_uhoh) /* 02 Access Error */
     .long   SYM(_uhoh) /* 03 Address Error */
@@ -346,7 +344,7 @@ SYM(start):
     move.l  d7, SYM(_d1_reset)
 
     /* Locate Stack Pointer */
-    move.l  #_StackInit,sp
+    move.l  #_Configuration_Interrupt_stack_area_end,sp
 
     /*
      * Remainder of the startup code is handled by C code
diff --git a/bsps/m68k/mrm332/start/linkcmds b/bsps/m68k/mrm332/start/linkcmds
index f86e80dd02..125538c50c 100644
--- a/bsps/m68k/mrm332/start/linkcmds
+++ b/bsps/m68k/mrm332/start/linkcmds
@@ -32,7 +32,6 @@ __DYNAMIC  =  0;
  * |    heap space      |
  * |        _ENDHEAP    |
  * |    stack space     | 
- * |        __stack     | top of stack
  * +--------------------+ <- high memory
  */
 
@@ -52,7 +51,6 @@ MEMORY
 
 _copy_data_from_rom = 1;
 HeapSize = DEFINED(HeapSize) ? HeapSize : 0x0;
-_StackSize = DEFINED(_StackSize) ? _StackSize : 0x2000;
 
 
 /*
@@ -194,9 +192,6 @@ SECTIONS
     *(COMMON)
     . = ALIGN (16);
     PROVIDE (end = .);
-    . += _StackSize;
-    . = ALIGN (16);
-    _stack_init = .;
     _clear_end = .;
   } > ram
   .rtemsstack (NOLOAD) : {
diff --git a/bsps/m68k/mrm332/start/start.S b/bsps/m68k/mrm332/start/start.S
index 5e2bbebc8e..300b74fc78 100644
--- a/bsps/m68k/mrm332/start/start.S
+++ b/bsps/m68k/mrm332/start/start.S
@@ -37,10 +37,10 @@ BEGIN_CODE
 	movel	#0x0,d0				/* Use the initial vectors until we get going */
 	movecl	d0,vbr
 
-	movel  #end, d0				/* Next 3 instructions set stack pointer    */
-	addl   #_StackSize,d0       /* sp = end + _StackSize from linker script */
-	movel  d0,sp
-	movel  d0,a6			
+	/* Set stack pointer */
+	movel	#_Configuration_Interrupt_stack_area_end,d0
+	movel	d0,sp
+	movel	d0,a6
 
   /* include in ram_init.S */
   /*
diff --git a/bsps/m68k/shared/start/linkcmds.base b/bsps/m68k/shared/start/linkcmds.base
index ee1d6ea4e2..fc726b4419 100644
--- a/bsps/m68k/shared/start/linkcmds.base
+++ b/bsps/m68k/shared/start/linkcmds.base
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008-2013 embedded brains GmbH.  All rights reserved.
+ * Copyright (c) 2008, 2018 embedded brains GmbH.  All rights reserved.
  *
  *  embedded brains GmbH
  *  Dornierstr. 4
@@ -19,8 +19,6 @@ OUTPUT_ARCH(m68k)
 ENTRY(start)
 STARTUP(start.o)
 
-bsp_initstack_size = DEFINED (bsp_initstack_size) ? bsp_initstack_size : 2048;
-
 MEMORY {
 	UNEXPECTED_SECTIONS : ORIGIN = 0xffffffff, LENGTH = 0
 }
@@ -226,12 +224,6 @@ SECTIONS {
 	} > REGION_DATA AT > REGION_DATA
 	bsp_vector1_size = bsp_vector1_end - bsp_vector1_begin;
 
-	.initstack : ALIGN_WITH_INPUT {
-		bsp_initstack_begin = .;
-		. = . + bsp_initstack_size;
-		bsp_initstack_end = .;
-	} > REGION_DATA AT > REGION_DATA
-
 	.data : ALIGN_WITH_INPUT {
 		bsp_section_data_begin = .;
 		*(.data .data.* .gnu.linkonce.d.*)
diff --git a/bsps/m68k/shared/start/start.S b/bsps/m68k/shared/start/start.S
index b3a3c8b664..9c40cbc3da 100644
--- a/bsps/m68k/shared/start/start.S
+++ b/bsps/m68k/shared/start/start.S
@@ -74,7 +74,7 @@ loop:   movel   #0,a1@+                 | to zero out uninitialized
         cmpal   a0,a1
         jlt     loop                    | loop until _end reached
 
-        movel   # SYM (_stack_init),d0  | d0 = stop of stack
+        movel   # SYM (_Configuration_Interrupt_stack_area_end),d0 | d0 = stop of stack
         movw    #0x3700,sr              | SUPV MODE,INTERRUPTS OFF!!!
         movel   d0,a7                   | set master stack pointer
         movel   d0,a6                   | set base pointer
@@ -135,13 +135,6 @@ SYM (initial_usp):
 SYM (initial_sr):
         .space  2
 
-	.align 16
-         PUBLIC (starting_stack)
-SYM (starting_stack):
-        .space  0x1000
-         PUBLIC (_stack_init)
-SYM (_stack_init):
-
 END_DATA
 #endif
 END