diff --git a/src/soc/broadcom/cygnus/bootblock.c b/src/soc/broadcom/cygnus/bootblock.c
index 37edf7f771..3c6d242d76 100644
--- a/src/soc/broadcom/cygnus/bootblock.c
+++ b/src/soc/broadcom/cygnus/bootblock.c
@@ -17,13 +17,20 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <arch/cache.h>
 #include <bootblock_common.h>
-#include <console/console.h>
+#include <stddef.h>
+#include <symbols.h>
 
 void bootblock_soc_init(void)
 {
 	/*
-	 * typically, this is the place where mmu is initialized to enable
-	 * cache. it helps speed up vboot verification.
+	 * not only for speed but for preventing the cpu from crashing.
+	 * the cpu is not happy when cache is cleaned without mmu turned on.
 	 */
+	mmu_init();
+	mmu_config_range(0, 4096, DCACHE_OFF);
+	mmu_config_range_kb((uintptr_t)_sram/KiB, _sram_size/KiB,
+			    DCACHE_WRITETHROUGH);
+	dcache_mmu_enable();
 }
diff --git a/src/soc/broadcom/cygnus/include/soc/memlayout.ld b/src/soc/broadcom/cygnus/include/soc/memlayout.ld
index c48c1bc221..cfa50a544f 100644
--- a/src/soc/broadcom/cygnus/include/soc/memlayout.ld
+++ b/src/soc/broadcom/cygnus/include/soc/memlayout.ld
@@ -31,6 +31,7 @@ SECTIONS
 	SRAM_START(0x02000000)
 	REGION(reserved_for_system_status, 0x02000000, 4K, 4)
 	TTB(0x02004000, 16K)		/* must be aligned to 16K */
+	TTB_SUBTABLES(0x02008000, 1K)
 	REGION(reserved_for_maskrom, 0x02009400, 4K, 4)
 	BOOTBLOCK(0x0200A440, 18K)
 	PRERAM_CBMEM_CONSOLE(0x0200F000, 4K)