diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
index 9013d35a67..562bbb2533 100644
--- a/hw/arm/aspeed.c
+++ b/hw/arm/aspeed.c
@@ -113,6 +113,8 @@ static void aspeed_board_init(MachineState *machine,
                                 &bmc->ram);
     object_property_add_const_link(OBJECT(&bmc->soc), "ram", OBJECT(&bmc->ram),
                                    &error_abort);
+    object_property_set_int(OBJECT(&bmc->soc), ram_size, "ram-size",
+                           &error_abort);
     object_property_set_int(OBJECT(&bmc->soc), cfg->hw_strap1, "hw-strap1",
                             &error_abort);
     object_property_set_bool(OBJECT(&bmc->soc), true, "realized",
diff --git a/hw/arm/aspeed_soc.c b/hw/arm/aspeed_soc.c
index 93bc7bb66e..c0a3102058 100644
--- a/hw/arm/aspeed_soc.c
+++ b/hw/arm/aspeed_soc.c
@@ -113,6 +113,8 @@ static void aspeed_soc_init(Object *obj)
     qdev_set_parent_bus(DEVICE(&s->sdmc), sysbus_get_default());
     qdev_prop_set_uint32(DEVICE(&s->sdmc), "silicon-rev",
                          sc->info->silicon_rev);
+    object_property_add_alias(obj, "ram-size", OBJECT(&s->sdmc),
+                              "ram-size", &error_abort);
 }
 
 static void aspeed_soc_realize(DeviceState *dev, Error **errp)
diff --git a/hw/misc/aspeed_sdmc.c b/hw/misc/aspeed_sdmc.c
index 20bcdb52c4..8830dc084c 100644
--- a/hw/misc/aspeed_sdmc.c
+++ b/hw/misc/aspeed_sdmc.c
@@ -140,9 +140,9 @@ static const MemoryRegionOps aspeed_sdmc_ops = {
     .valid.max_access_size = 4,
 };
 
-static int ast2400_rambits(void)
+static int ast2400_rambits(AspeedSDMCState *s)
 {
-    switch (ram_size >> 20) {
+    switch (s->ram_size >> 20) {
     case 64:
         return ASPEED_SDMC_DRAM_64MB;
     case 128:
@@ -156,14 +156,15 @@ static int ast2400_rambits(void)
     }
 
     /* use a common default */
-    error_report("warning: Invalid RAM size 0x" RAM_ADDR_FMT
-                 ". Using default 256M", ram_size);
+    error_report("warning: Invalid RAM size 0x%" PRIx64
+                 ". Using default 256M", s->ram_size);
+    s->ram_size = 256 << 20;
     return ASPEED_SDMC_DRAM_256MB;
 }
 
-static int ast2500_rambits(void)
+static int ast2500_rambits(AspeedSDMCState *s)
 {
-    switch (ram_size >> 20) {
+    switch (s->ram_size >> 20) {
     case 128:
         return ASPEED_SDMC_AST2500_128MB;
     case 256:
@@ -177,8 +178,9 @@ static int ast2500_rambits(void)
     }
 
     /* use a common default */
-    error_report("warning: Invalid RAM size 0x" RAM_ADDR_FMT
-                 ". Using default 512M", ram_size);
+    error_report("warning: Invalid RAM size 0x%" PRIx64
+                 ". Using default 512M", s->ram_size);
+    s->ram_size = 512 << 20;
     return ASPEED_SDMC_AST2500_512MB;
 }
 
@@ -222,11 +224,11 @@ static void aspeed_sdmc_realize(DeviceState *dev, Error **errp)
 
     switch (s->silicon_rev) {
     case AST2400_A0_SILICON_REV:
-        s->ram_bits = ast2400_rambits();
+        s->ram_bits = ast2400_rambits(s);
         break;
     case AST2500_A0_SILICON_REV:
     case AST2500_A1_SILICON_REV:
-        s->ram_bits = ast2500_rambits();
+        s->ram_bits = ast2500_rambits(s);
         break;
     default:
         g_assert_not_reached();
@@ -249,6 +251,7 @@ static const VMStateDescription vmstate_aspeed_sdmc = {
 
 static Property aspeed_sdmc_properties[] = {
     DEFINE_PROP_UINT32("silicon-rev", AspeedSDMCState, silicon_rev, 0),
+    DEFINE_PROP_UINT64("ram-size", AspeedSDMCState, ram_size, 0),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/include/hw/misc/aspeed_sdmc.h b/include/hw/misc/aspeed_sdmc.h
index df7dce0edd..551c8afdf4 100644
--- a/include/hw/misc/aspeed_sdmc.h
+++ b/include/hw/misc/aspeed_sdmc.h
@@ -26,6 +26,7 @@ typedef struct AspeedSDMCState {
     uint32_t regs[ASPEED_SDMC_NR_REGS];
     uint32_t silicon_rev;
     uint32_t ram_bits;
+    uint64_t ram_size;
 
 } AspeedSDMCState;