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-rw-r--r--src/cpu/x86/smm/smm_module_loader.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cpu/x86/smm/smm_module_loader.c b/src/cpu/x86/smm/smm_module_loader.c
index 768d2ca1bb..05554245fc 100644
--- a/src/cpu/x86/smm/smm_module_loader.c
+++ b/src/cpu/x86/smm/smm_module_loader.c
@@ -428,7 +428,7 @@ int smm_load_module(const uintptr_t smram_base, const size_t smram_size,
const uintptr_t smram_top = region_end(&smram);
const size_t stm_size =
- CONFIG(STM) ? CONFIG_MSEG_SIZE - CONFIG_BIOS_RESOURCE_LIST_SIZE : 0;
+ CONFIG(STM) ? CONFIG_MSEG_SIZE + CONFIG_BIOS_RESOURCE_LIST_SIZE : 0;
if (CONFIG(STM)) {
struct region stm = {};