diff --git a/src/slab.c b/src/slab.c
index f4806ddb60df57b80cb2245f005a9f01bc3a902e..0872ecf092251ce7b638de12fb598ea621bdb437 100644
--- a/src/slab.c
+++ b/src/slab.c
@@ -217,9 +217,9 @@ struct memusage
 };
 static struct memusage *memusage = RT_NULL;
 #define btokup(addr)    \
-    (&memusage[((rt_uint32_t)(addr) - heap_start) >> RT_MM_PAGE_BITS])
+    (&memusage[((rt_ubase_t)(addr) - heap_start) >> RT_MM_PAGE_BITS])
 
-static rt_uint32_t heap_start, heap_end;
+static rt_ubase_t heap_start, heap_end;
 
 /* page allocator */
 struct rt_page_head
@@ -275,7 +275,7 @@ void rt_page_free(void *addr, rt_size_t npages)
     struct rt_page_head **prev;
 
     RT_ASSERT(addr != RT_NULL);
-    RT_ASSERT((rt_uint32_t)addr % RT_MM_PAGE_SIZE == 0);
+    RT_ASSERT((rt_ubase_t)addr % RT_MM_PAGE_SIZE == 0);
     RT_ASSERT(npages != 0);
 
     n = (struct rt_page_head *)addr;
@@ -348,13 +348,13 @@ void rt_system_heap_init(void *begin_addr, void *end_addr)
     RT_DEBUG_NOT_IN_INTERRUPT;
 
     /* align begin and end addr to page */
-    heap_start = RT_ALIGN((rt_uint32_t)begin_addr, RT_MM_PAGE_SIZE);
-    heap_end   = RT_ALIGN_DOWN((rt_uint32_t)end_addr, RT_MM_PAGE_SIZE);
+    heap_start = RT_ALIGN((rt_ubase_t)begin_addr, RT_MM_PAGE_SIZE);
+    heap_end   = RT_ALIGN_DOWN((rt_ubase_t)end_addr, RT_MM_PAGE_SIZE);
 
     if (heap_start >= heap_end)
     {
         rt_kprintf("rt_system_heap_init, wrong address[0x%x - 0x%x]\n",
-                   (rt_uint32_t)begin_addr, (rt_uint32_t)end_addr);
+                   (rt_ubase_t)begin_addr, (rt_ubase_t)end_addr);
 
         return;
     }
@@ -391,7 +391,7 @@ void rt_system_heap_init(void *begin_addr, void *end_addr)
     memusage = rt_page_alloc(limsize / RT_MM_PAGE_SIZE);
 
     RT_DEBUG_LOG(RT_DEBUG_SLAB, ("memusage 0x%x, size 0x%x\n",
-                                 (rt_uint32_t)memusage, limsize));
+                                 (rt_ubase_t)memusage, limsize));
 }
 
 /*
@@ -401,7 +401,7 @@ void rt_system_heap_init(void *begin_addr, void *end_addr)
 rt_inline int zoneindex(rt_size_t *bytes)
 {
     /* unsigned for shift opt */
-    rt_uint32_t n = (rt_uint32_t)(*bytes);
+    rt_ubase_t n = (rt_ubase_t)(*bytes);
 
     if (n < 128)
     {
@@ -507,7 +507,7 @@ void *rt_malloc(rt_size_t size)
                      ("malloc a large memory 0x%x, page cnt %d, kup %d\n",
                       size,
                       size >> RT_MM_PAGE_BITS,
-                      ((rt_uint32_t)chunk - heap_start) >> RT_MM_PAGE_BITS));
+                      ((rt_ubase_t)chunk - heap_start) >> RT_MM_PAGE_BITS));
 
         /* lock heap */
         rt_sem_take(&heap_sem, RT_WAITING_FOREVER);
@@ -610,7 +610,7 @@ void *rt_malloc(rt_size_t size)
             rt_sem_take(&heap_sem, RT_WAITING_FOREVER);
 
             RT_DEBUG_LOG(RT_DEBUG_SLAB, ("alloc a new zone: 0x%x\n",
-                                         (rt_uint32_t)z));
+                                         (rt_ubase_t)z));
 
             /* set message usage */
             for (off = 0, kup = btokup(z); off < zone_page_cnt; off ++)
@@ -694,7 +694,7 @@ void *rt_realloc(void *ptr, rt_size_t size)
      * Get the original allocation's zone.  If the new request winds up
      * using the same chunk size we do not have to do anything.
      */
-    kup = btokup((rt_uint32_t)ptr & ~RT_MM_PAGE_MASK);
+    kup = btokup((rt_ubase_t)ptr & ~RT_MM_PAGE_MASK);
     if (kup->type == PAGE_TYPE_LARGE)
     {
         rt_size_t osize;
@@ -709,7 +709,7 @@ void *rt_realloc(void *ptr, rt_size_t size)
     }
     else if (kup->type == PAGE_TYPE_SMALL)
     {
-        z = (slab_zone *)(((rt_uint32_t)ptr & ~RT_MM_PAGE_MASK) -
+        z = (slab_zone *)(((rt_ubase_t)ptr & ~RT_MM_PAGE_MASK) -
                           kup->size * RT_MM_PAGE_SIZE);
         RT_ASSERT(z->z_magic == ZALLOC_SLAB_MAGIC);
 
@@ -783,20 +783,20 @@ void rt_free(void *ptr)
     /* get memory usage */
 #if RT_DEBUG_SLAB
     {
-        rt_uint32_t addr = ((rt_uint32_t)ptr & ~RT_MM_PAGE_MASK);
+        rt_ubase_t addr = ((rt_ubase_t)ptr & ~RT_MM_PAGE_MASK);
         RT_DEBUG_LOG(RT_DEBUG_SLAB,
                      ("free a memory 0x%x and align to 0x%x, kup index %d\n",
-                      (rt_uint32_t)ptr,
-                      (rt_uint32_t)addr,
-                      ((rt_uint32_t)(addr) - heap_start) >> RT_MM_PAGE_BITS));
+                      (rt_ubase_t)ptr,
+                      (rt_ubase_t)addr,
+                      ((rt_ubase_t)(addr) - heap_start) >> RT_MM_PAGE_BITS));
     }
 #endif
 
-    kup = btokup((rt_uint32_t)ptr & ~RT_MM_PAGE_MASK);
+    kup = btokup((rt_ubase_t)ptr & ~RT_MM_PAGE_MASK);
     /* release large allocation */
     if (kup->type == PAGE_TYPE_LARGE)
     {
-        rt_uint32_t size;
+        rt_ubase_t size;
 
         /* lock heap */
         rt_sem_take(&heap_sem, RT_WAITING_FOREVER);
@@ -811,7 +811,7 @@ void rt_free(void *ptr)
 
         RT_DEBUG_LOG(RT_DEBUG_SLAB,
                      ("free large memory block 0x%x, page count %d\n",
-                      (rt_uint32_t)ptr, size));
+                      (rt_ubase_t)ptr, size));
 
         /* free this page */
         rt_page_free(ptr, size);
@@ -823,7 +823,7 @@ void rt_free(void *ptr)
     rt_sem_take(&heap_sem, RT_WAITING_FOREVER);
 
     /* zone case. get out zone. */
-    z = (slab_zone *)(((rt_uint32_t)ptr & ~RT_MM_PAGE_MASK) -
+    z = (slab_zone *)(((rt_ubase_t)ptr & ~RT_MM_PAGE_MASK) -
                       kup->size * RT_MM_PAGE_SIZE);
     RT_ASSERT(z->z_magic == ZALLOC_SLAB_MAGIC);
 
@@ -857,7 +857,7 @@ void rt_free(void *ptr)
         slab_zone **pz;
 
         RT_DEBUG_LOG(RT_DEBUG_SLAB, ("free zone 0x%x\n",
-                                     (rt_uint32_t)z, z->z_zoneindex));
+                                     (rt_ubase_t)z, z->z_zoneindex));
 
         /* remove zone from zone array list */
         for (pz = &zone_array[z->z_zoneindex]; z != *pz; pz = &(*pz)->z_next)