diff --git a/configs/stm32mp15_basic_defconfig b/configs/stm32mp15_basic_defconfig
index fbca482877..a60198f930 100644
--- a/configs/stm32mp15_basic_defconfig
+++ b/configs/stm32mp15_basic_defconfig
@@ -170,3 +170,6 @@ CONFIG_WDT_STM32MP=y
 CONFIG_ERRNO_STR=y
 # CONFIG_HEXDUMP is not set
 CONFIG_FDT_FIXUP_PARTITIONS=y
+# CONFIG_LMB_USE_MAX_REGIONS is not set
+CONFIG_LMB_MEMORY_REGIONS=2
+CONFIG_LMB_RESERVED_REGIONS=16
diff --git a/configs/stm32mp15_trusted_defconfig b/configs/stm32mp15_trusted_defconfig
index ba9a660abf..8c71ca6b6d 100644
--- a/configs/stm32mp15_trusted_defconfig
+++ b/configs/stm32mp15_trusted_defconfig
@@ -152,3 +152,6 @@ CONFIG_WDT_STM32MP=y
 CONFIG_ERRNO_STR=y
 # CONFIG_HEXDUMP is not set
 CONFIG_FDT_FIXUP_PARTITIONS=y
+# CONFIG_LMB_USE_MAX_REGIONS is not set
+CONFIG_LMB_MEMORY_REGIONS=2
+CONFIG_LMB_RESERVED_REGIONS=16