diff --git a/configs/stm32mp13_defconfig b/configs/stm32mp13_defconfig
index 5e9abc5e262..82b62744f6d 100644
--- a/configs/stm32mp13_defconfig
+++ b/configs/stm32mp13_defconfig
@@ -7,7 +7,7 @@ CONFIG_ENV_OFFSET=0x900000
 CONFIG_DEFAULT_DEVICE_TREE="stm32mp135f-dk"
 CONFIG_SYS_PROMPT="STM32MP> "
 CONFIG_STM32MP13x=y
-CONFIG_DDR_CACHEABLE_SIZE=0x10000000
+CONFIG_DDR_CACHEABLE_SIZE=0x8000000
 CONFIG_CMD_STM32KEY=y
 CONFIG_TARGET_ST_STM32MP13x=y
 CONFIG_ENV_OFFSET_REDUND=0x940000
diff --git a/configs/stm32mp15_defconfig b/configs/stm32mp15_defconfig
index 12b9b549732..2700b5c4991 100644
--- a/configs/stm32mp15_defconfig
+++ b/configs/stm32mp15_defconfig
@@ -7,7 +7,7 @@ CONFIG_ENV_OFFSET=0x900000
 CONFIG_ENV_SECT_SIZE=0x40000
 CONFIG_DEFAULT_DEVICE_TREE="stm32mp157c-ev1"
 CONFIG_SYS_PROMPT="STM32MP> "
-CONFIG_DDR_CACHEABLE_SIZE=0x10000000
+CONFIG_DDR_CACHEABLE_SIZE=0x8000000
 CONFIG_CMD_STM32KEY=y
 CONFIG_TYPEC_STUSB160X=y
 CONFIG_TARGET_ST_STM32MP15x=y