From 3e193cca2c2304fc6a3db751ee0ee733eeef4839 Mon Sep 17 00:00:00 2001
From: Jim Paris <jim@jtan.com>
Date: Tue, 29 Jul 2014 18:06:43 -0400
Subject: [PATCH] aducrf101: Rearrange stack and heap to maximize available
 stack space

Stack now starts at the top of RAM, heap starts after BSS, and
they grow towards each other.
---
 cpu/arm/aducrf101/Common/GCC/ADuCRF101.ld |  7 +++++--
 cpu/arm/aducrf101/Common/GCC/crt0.S       | 11 -----------
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/cpu/arm/aducrf101/Common/GCC/ADuCRF101.ld b/cpu/arm/aducrf101/Common/GCC/ADuCRF101.ld
index 8d553a5f7..a6effb701 100644
--- a/cpu/arm/aducrf101/Common/GCC/ADuCRF101.ld
+++ b/cpu/arm/aducrf101/Common/GCC/ADuCRF101.ld
@@ -91,10 +91,8 @@ SECTIONS
         } > ram AT > flash
 
         .bss : {
-                /* Stack is in BSS */
                 . = ALIGN(8);
                 __bss_start = .;
-                *(.bss.stack)
                 *(.bss)
                 *(.bss.*)
                 *(COMMON)
@@ -102,4 +100,9 @@ SECTIONS
                 __bss_end = .;
                 end = .;
         } > ram
+
+        /* Heap grows up from "end" (after bss), and stack grows down from
+           the end of RAM. */
+        . = ORIGIN(ram) + LENGTH(ram);
+        stack_end = .;
 }
diff --git a/cpu/arm/aducrf101/Common/GCC/crt0.S b/cpu/arm/aducrf101/Common/GCC/crt0.S
index 592f97902..04b868448 100644
--- a/cpu/arm/aducrf101/Common/GCC/crt0.S
+++ b/cpu/arm/aducrf101/Common/GCC/crt0.S
@@ -32,19 +32,8 @@
  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef __STACK_SIZE
-#define __STACK_SIZE 1024
-#endif
-
 .equ SCB_VTOR, 0xE000ED08
 
-/* Stack */
-        .section .bss.stack
-stack_start:
-        .space __STACK_SIZE, 0
-stack_end:
-        .global stack_end
-
 /* Vector table */
         .macro handler name
         .long \name\()