diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c
index 82a5ecff04..6aa3841b69 100644
--- a/hw/arm/aspeed_ast27x0.c
+++ b/hw/arm/aspeed_ast27x0.c
@@ -23,14 +23,14 @@
 #include "qobject/qlist.h"
 #include "qemu/log.h"
 
-#define AST2700_SOC_IO_SIZE          0x01000000
+#define AST2700_SOC_IO_SIZE          0x00FE0000
 #define AST2700_SOC_IOMEM_SIZE       0x01000000
 #define AST2700_SOC_DPMCU_SIZE       0x00040000
 #define AST2700_SOC_LTPI_SIZE        0x01000000
 
 static const hwaddr aspeed_soc_ast2700_memmap[] = {
-    [ASPEED_DEV_IOMEM]     =  0x00000000,
     [ASPEED_DEV_VBOOTROM]  =  0x00000000,
+    [ASPEED_DEV_IOMEM]     =  0x00020000,
     [ASPEED_DEV_SRAM]      =  0x10000000,
     [ASPEED_DEV_DPMCU]     =  0x11000000,
     [ASPEED_DEV_IOMEM0]    =  0x12000000,