1 files changed, 15 insertions, 0 deletions
diff --git a/src/soc/ibm/power9/cbmem.c b/src/soc/ibm/power9/cbmem.c
new file mode 100644
index 000000000000..9543c4584809
--- /dev/null
+++ b/src/soc/ibm/power9/cbmem.c
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <cbmem.h>
+
+uintptr_t cbmem_top_chipset(void)
+{
+	/*
+	 * Smallest reported to be working (but not officially supported) DIMM is
+	 * 4GB. This means that we always have at least as much available. Last
+	 * 256MB are reserved for hostboot/coreboot (OCC and HOMER images).
+	 *
+	 * TODO: implement this properly after RAM is detected.
+	 */
+	return 4ull * GiB - 256 * MiB;
+}