diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index a3765e0be4a8..f6cff7b5a547 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -40,6 +40,7 @@
 #include <linux/bootmem.h>
 #include <linux/slab.h>
 #include <asm/desc.h>
+#include <asm/cacheflush.h>
 
 #define PCI_BIOS32_SD_VALUE		0x5F32335F	/* "_32_" */
 #define CRU_BIOS_SIGNATURE_VALUE	0x55524324
@@ -394,6 +395,8 @@ static void __devinit dmi_find_cru(const struct dmi_header *dm)
 				smbios_cru64_ptr->double_offset;
 			cru_rom_addr = ioremap(cru_physical_address,
 				smbios_cru64_ptr->double_length);
+			set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
+				smbios_cru64_ptr->double_length >> PAGE_SHIFT);
 		}
 	}
 }