diff --git a/src/soc/intel/tigerlake/systemagent.c b/src/soc/intel/tigerlake/systemagent.c
index 8c0a42a..08d1ef3 100644
--- a/src/soc/intel/tigerlake/systemagent.c
+++ b/src/soc/intel/tigerlake/systemagent.c
@@ -67,3 +67,17 @@
 	soc_config = &config->power_limits_config;
 	set_power_limits(MOBILE_SKU_PL1_TIME_SEC, soc_config);
 }
+
+uint32_t soc_systemagent_max_chan_capacity_mib(u8 capid0_a_ddrsz)
+{
+	switch (capid0_a_ddrsz) {
+	case 1:
+		return 8192;
+	case 2:
+		return 4096;
+	case 3:
+		return 2048;
+	default:
+		return 65536;
+	}
+}