diff --git a/src/soc/intel/apollolake/include/soc/meminit.h b/src/soc/intel/apollolake/include/soc/meminit.h
index b08427026f..06da347078 100644
--- a/src/soc/intel/apollolake/include/soc/meminit.h
+++ b/src/soc/intel/apollolake/include/soc/meminit.h
@@ -51,6 +51,8 @@ enum {
 
 /* LPDDR4 module density in bits. */
 enum {
+	LP4_4Gb_DENSITY = 4,
+	LP4_6Gb_DENSITY = 6,
 	LP4_8Gb_DENSITY = 8,
 	LP4_12Gb_DENSITY = 12,
 	LP4_16Gb_DENSITY = 16,
diff --git a/src/soc/intel/apollolake/meminit.c b/src/soc/intel/apollolake/meminit.c
index d744ac6a87..0a8a26d478 100644
--- a/src/soc/intel/apollolake/meminit.c
+++ b/src/soc/intel/apollolake/meminit.c
@@ -278,6 +278,12 @@ void meminit_lpddr4_enable_channel(FSP_M_CONFIG *cfg, int logical_chan,
 	int fsp_rank_density;
 
 	switch (rank_density_gb) {
+	case LP4_4Gb_DENSITY:
+		fsp_rank_density = 0;
+		break;
+	case LP4_6Gb_DENSITY:
+		fsp_rank_density = 1;
+		break;
 	case LP4_8Gb_DENSITY:
 		fsp_rank_density = 2;
 		break;