LPC2368 [GCC_ARM]: Fixed: Compilation and link errors in case "SD" example.

Author: dinau

libraries/mbed/common/retarget.cpp

@@ -439,13 +439,20 @@ extern "C" int __end__;
 #undef errno
 extern "C" int errno;
 
+// For ARM7 only
+register unsigned char * stack_ptr __asm ("sp");
+
 // Dynamic memory allocation related syscall.
 extern "C" caddr_t _sbrk(int incr) {
     static unsigned char* heap = (unsigned char*)&__end__;
     unsigned char*        prev_heap = heap;
     unsigned char*        new_heap = heap + incr;
 
+#ifdef __get_MSP
     if (new_heap >= (unsigned char*)__get_MSP()) {
+#else
+    if (new_heap >= stack_ptr) {
+#endif
         errno = ENOMEM;
         return (caddr_t)-1;
     }

libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC23XX/TOOLCHAIN_GCC_ARM/LPC2368.ld

@@ -143,6 +143,7 @@ SECTIONS
     . = ALIGN( 8 ) ;
     __heap_start__ = . ;
     end = . ;
+    __end__ = . ;
 
     .stab    0 (NOLOAD) : { *(.stab) }
     .stabstr 0 (NOLOAD) : { *(.stabstr) }