diff --git a/src/coparun/mem_man.c b/src/coparun/mem_man.c
index 5fab4b3..1093a02 100644
--- a/src/coparun/mem_man.c
+++ b/src/coparun/mem_man.c
@@ -9,37 +9,48 @@
 #include <stdint.h>
 
 
-#if defined DATA_MEMORY_ADDR || defined EXECUTABLE_MEMORY_ADDR
+#if defined DATA_MEMORY_LEN || defined EXECUTABLE_MEMORY_LEN
 /* Bare metal implementations */
-#if not defined(EXECUTABLE_MEMORY_ADDR) || not defined(DATA_MEMORY_ADDR)
-    #error "For bare metal, you must define DATA_MEMORY_ADDR and DATA_EXECUTABLE_MEMORY_ADDR."
+#if !defined(EXECUTABLE_MEMORY_LEN) || !defined(DATA_MEMORY_LEN)
+    #error "For bare metal, you must define DATA_MEMORY_LEN and DATA_EXECUTABLE_MEMORY_LEN."
 #endif
 
+uint8_t executable_memory_pool[EXECUTABLE_MEMORY_LEN];
+uint8_t data_memory_pool[DATA_MEMORY_LEN];
+
 uint8_t *allocate_executable_memory(uint32_t num_bytes) {
-    return (uint8_t*)EXECUTABLE_MEMORY_ADDR;
+    if (num_bytes > EXECUTABLE_MEMORY_LEN) return 0;
+    return executable_memory_pool;
 }
 
 uint8_t *allocate_data_memory(uint32_t num_bytes) {
-    return (uint8_t*)DATA_MEMORY_ADDR;
+    if (num_bytes > DATA_MEMORY_LEN) return 0;
+    return data_memory_pool;
 }
 
 int mark_mem_executable(uint8_t *memory, uint32_t memory_len) {
     /* No-op for bare metal */
+    (void)memory;        // Mark as used
+    (void)memory_len;    // Mark as used
     return 1;
 }
 
 void deallocate_memory(uint8_t *memory, uint32_t memory_len) {
+    (void)memory;        // Mark as used
+    (void)memory_len;    // Mark as used
     /* No-op for bare metal */
 }
 
-void memcpy(void *dest, const void *src, size_t n) {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wbuiltin-declaration-mismatch"
+void memcpy(void *dest, const void *src, unsigned int n) {
     uint8_t *d = (uint8_t*)dest;
     const uint8_t *s = (const uint8_t*)src;
-    for (size_t i = 0; i < n; i++) {
+    for (unsigned int i = 0; i < n; i++) {
         d[i] = s[i];
     }
-    return 0;
 }
+#pragma GCC diagnostic pop
 
 
 #elif defined _WIN32
diff --git a/src/coparun/mem_man.h b/src/coparun/mem_man.h
index 4767f33..6cc23d3 100644
--- a/src/coparun/mem_man.h
+++ b/src/coparun/mem_man.h
@@ -7,8 +7,11 @@ uint8_t *allocate_buffer_memory(uint32_t num_bytes);
 int mark_mem_executable(uint8_t *memory, uint32_t memory_len);
 void deallocate_memory(uint8_t *memory, uint32_t memory_len);
 
-#ifdef DATA_MEMORY_ADDR
-void memcpy(void *dest, const void *src, size_t n);
+#ifdef DATA_MEMORY_LEN
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wbuiltin-declaration-mismatch"
+void memcpy(void *dest, const void *src, unsigned int n);
+#pragma GCC diagnostic pop
 #else
 #include <string.h>
 #endif
diff --git a/src/coparun/runmem.c b/src/coparun/runmem.c
index 5028733..04346aa 100644
--- a/src/coparun/runmem.c
+++ b/src/coparun/runmem.c
@@ -119,9 +119,9 @@ void free_memory(runmem_t *context) {
     deallocate_memory(context->data_memory, context->data_memory_len);
     context->executable_memory_len = 0;
     context->data_memory_len = 0;
-    context->executable_memory = NULL;
-    context->data_memory = NULL;
-    context->entr_point = NULL;
+    context->executable_memory = 0;
+    context->data_memory = 0;
+    context->entr_point = 0;
     context->data_offs = 0;
 }
 
@@ -129,7 +129,6 @@ int update_data_offs(runmem_t *context) {
     if (context->data_memory && context->executable_memory &&
         (context->data_memory - context->executable_memory > 0x7FFFFFFF ||
          context->executable_memory - context->data_memory > 0x7FFFFFFF)) {
-        perror("Error: code and data memory to far apart");
         return 0;
     }
     context->data_offs = (int)(context->data_memory - context->executable_memory);
diff --git a/src/coparun/runmem.h b/src/coparun/runmem.h
index cd74053..c6aefe8 100644
--- a/src/coparun/runmem.h
+++ b/src/coparun/runmem.h
@@ -10,7 +10,7 @@
 
 #include <stdint.h>
 
-#ifdef DATA_MEMORY_ADDR
+#ifdef DATA_MEMORY_LEN
     #define PRINTF(...)
 #else
     #include <stdio.h>