diff --git a/mm/memory.c b/mm/memory.c
index efa3d5c6..11f6fdce 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -152,8 +152,8 @@ int mmu_init(void)
 		}
 	} 
 #elif defined(CONFIG_ROCKCREEK)
-	/* of course, the first slot belongs to the private memory */
-	for(addr=0x00; addr<0x1000000; addr+=PAGE_SIZE) {
+	/* of course, the first twenty slots belong to the private memory */
+	for(addr=0x00; addr<20*0x1000000; addr+=PAGE_SIZE) {
 		page_clear_mark(addr >> PAGE_SHIFT);
 		if (addr > addr + PAGE_SIZE)
 			break;
@@ -161,6 +161,15 @@ int mmu_init(void)
 		atomic_int32_inc(&total_available_pages);	
 	}
 
+	// Note: The last slot belongs always to the private memory.
+	for(addr=0xFF000000; addr<0xFFFFFFFF; addr+=PAGE_SIZE) {
+		page_clear_mark(addr >> PAGE_SHIFT);
+		if (addr > addr + PAGE_SIZE)
+			break;
+		atomic_int32_inc(&total_pages);
+		atomic_int32_inc(&total_available_pages);
+	}
+
 	/*
 	 * Mark the bootinfo as used.
 	 */
@@ -201,8 +210,8 @@ int mmu_init(void)
 
 #ifdef CONFIG_ROCKCREEK
 	/*
-	 * Now, we are able to read the FPGA register and to
-	 * determin the number of slots.
+	 * Now, we are able to read the FPGA registers and to
+	 * determine the number of slots for private memory.
 	 */
 	uint32_t slots = *((volatile uint32_t*) (FPGA_BASE + 0x8244));
 	if (slots == 0)
@@ -210,17 +219,8 @@ int mmu_init(void)
 
 	kprintf("MetalSVM use %d slots for private memory\n", slots);
 
-	// define all the private slots as free
-	for(addr=0x1000000; addr<(slots-1)*0x1000000; addr+=PAGE_SIZE) {
-		page_clear_mark(addr >> PAGE_SHIFT);
-		if (addr > addr + PAGE_SIZE)
-			break;
-		atomic_int32_inc(&total_pages);
-		atomic_int32_inc(&total_available_pages);
-	}
-
-	// Note: The last slot belongs always to the private memory.
-	for(addr=0xFF000000; addr<0xFFFFFFFF; addr+=PAGE_SIZE) {
+	// define the residual private slots as free
+	for(addr=20*0x1000000; addr<(slots-1)*0x1000000; addr+=PAGE_SIZE) {
 		page_clear_mark(addr >> PAGE_SHIFT);
 		if (addr > addr + PAGE_SIZE)
 			break;