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diff --git a/nuttx/arch/z80/src/z180/up_mem.h b/nuttx/arch/z80/src/z180/up_mem.h
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+/************************************************************************************
+ * common/sdcc.h
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_Z180_SRC_COMMON_UP_MEM_H
+#define __ARCH_Z180_SRC_COMMON_UP_MEM_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/* Locate the IDLE thread stack at the end of RAM. */
+
+#define CONFIG_STACK_END   CONFIG_DRAM_SIZE
+#define CONFIG_STACK_BASE  (CONFIG_STACK_END - CONFIG_IDLETHREAD_STACKSIZE)
+
+/* The heap then extends from the linker determined beginning of the heap (s__HEAP).
+ * to the bottom of the IDLE thread stack.  NOTE:  The symbol s__HEAP is not
+ * accessible from C because it does not begin with the _ character.  g_heapbase
+ * is defined in z180_head.asm to provide that value to the C code.
+ */
+
+#define CONFIG_HEAP1_END   CONFIG_STACK_BASE
+#define CONFIG_HEAP1_BASE  g_heapbase
+
+/************************************************************************************
+ * Public variables
+ ************************************************************************************/
+
+/* This is the bottom of the heap as provided by the linker symbol s__HEAP. NOTE:
+ * The symbol s__HEAP is not accessible from C because it does not begin with the _
+ * character.  g_heapbase is defined in z180_head.asm to provide that value to the C
+ * code.
+ */
+
+extern const uint16_t g_heapbase;
+
+#endif  /* __ARCH_Z180_SRC_COMMON_UP_MEM_H */