diff --git a/Kconfig b/Kconfig
index b879461..8f96c94 100644
--- a/Kconfig
+++ b/Kconfig
@@ -72,13 +72,31 @@ config SYS_MALLOC_F_LEN
 	  initial serial device and any others that are needed.
 
 menuconfig EXPERT
-        bool "Configure standard U-Boot features (expert users)"
-        help
-          This option allows certain base U-Boot options and settings
-          to be disabled or tweaked. This is for specialized
-          environments which can tolerate a "non-standard" U-Boot.
-          Only use this if you really know what you are doing.
-
+	bool "Configure standard U-Boot features (expert users)"
+	default y
+	help
+	  This option allows certain base U-Boot options and settings
+	  to be disabled or tweaked. This is for specialized
+	  environments which can tolerate a "non-standard" U-Boot.
+	  Only use this if you really know what you are doing.
+
+if EXPERT
+	config SYS_MALLOC_CLEAR_ON_INIT
+	bool "Init with zeros the memory reserved for malloc (slow)"
+	default y
+	help
+	  This setting is enabled by default. The reserved malloc
+	  memory is initialized with zeros, so first malloc calls
+	  will return the pointer to the zeroed memory. But this
+	  slows the boot time.
+
+	  It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
+	  value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
+	  Then the boot time can be significantly reduced.
+	  Warning:
+	  When disabling this, please check if malloc calls, maybe
+	  should be replaced by calloc - if expects zeroed memory.
+endif
 endmenu		# General setup
 
 menu "Boot images"
diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index 6453ee9..b2ce063 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -1535,9 +1535,9 @@ void mem_malloc_init(ulong start, ulong size)
 
 	debug("using memory %#lx-%#lx for malloc()\n", mem_malloc_start,
 	      mem_malloc_end);
-
-	memset((void *)mem_malloc_start, 0, size);
-
+#ifdef CONFIG_SYS_MALLOC_CLEAR_ON_INIT
+	memset((void *)mem_malloc_start, 0x0, size);
+#endif
 	malloc_bin_reloc();
 }
 
@@ -2948,10 +2948,12 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size;
 
 
   /* check if expand_top called, in which case don't need to clear */
+#ifdef CONFIG_SYS_MALLOC_CLEAR_ON_INIT
 #if MORECORE_CLEARS
   mchunkptr oldtop = top;
   INTERNAL_SIZE_T oldtopsize = chunksize(top);
 #endif
+#endif
   Void_t* mem = mALLOc (sz);
 
   if ((long)n < 0) return NULL;
@@ -2977,6 +2979,7 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size;
 
     csz = chunksize(p);
 
+#ifdef CONFIG_SYS_MALLOC_CLEAR_ON_INIT
 #if MORECORE_CLEARS
     if (p == oldtop && csz > oldtopsize)
     {
@@ -2984,6 +2987,7 @@ Void_t* cALLOc(n, elem_size) size_t n; size_t elem_size;
       csz = oldtopsize;
     }
 #endif
+#endif
 
     MALLOC_ZERO(mem, csz - SIZE_SZ);
     return mem;