diff --git a/hw/arm/exynos4210.c b/hw/arm/exynos4210.c
index 3af6502a5e..4e1fd7edb3 100644
--- a/hw/arm/exynos4210.c
+++ b/hw/arm/exynos4210.c
@@ -320,7 +320,6 @@ static void exynos4210_realize(DeviceState *socdev, Error **errp)
                              &s->irom_mem,
                              0,
                              EXYNOS4210_IROM_SIZE);
-    memory_region_set_readonly(&s->irom_alias_mem, true);
     memory_region_add_subregion(system_mem, EXYNOS4210_IROM_MIRROR_BASE_ADDR,
                                 &s->irom_alias_mem);
 
diff --git a/hw/arm/stm32f205_soc.c b/hw/arm/stm32f205_soc.c
index 2de56275b7..6e93726d45 100644
--- a/hw/arm/stm32f205_soc.c
+++ b/hw/arm/stm32f205_soc.c
@@ -97,7 +97,6 @@ static void stm32f205_soc_realize(DeviceState *dev_soc, Error **errp)
                            &error_fatal);
     memory_region_init_alias(flash_alias, NULL, "STM32F205.flash.alias",
                              flash, 0, FLASH_SIZE);
-    memory_region_set_readonly(flash_alias, true);
 
     memory_region_add_subregion(system_memory, FLASH_BASE_ADDRESS, flash);
     memory_region_add_subregion(system_memory, 0, flash_alias);
diff --git a/hw/arm/stm32f405_soc.c b/hw/arm/stm32f405_soc.c
index b8fca13f95..d590cd040d 100644
--- a/hw/arm/stm32f405_soc.c
+++ b/hw/arm/stm32f405_soc.c
@@ -103,7 +103,6 @@ static void stm32f405_soc_realize(DeviceState *dev_soc, Error **errp)
     }
     memory_region_init_alias(&s->flash_alias, NULL, "STM32F405.flash.alias",
                              &s->flash, 0, FLASH_SIZE);
-    memory_region_set_readonly(&s->flash_alias, true);
 
     memory_region_add_subregion(system_memory, FLASH_BASE_ADDRESS, &s->flash);
     memory_region_add_subregion(system_memory, 0, &s->flash_alias);