diff --git a/src/mainboard/google/volteer/variants/collis/Makefile.inc b/src/mainboard/google/volteer/variants/collis/Makefile.inc
new file mode 100644
index 0000000000..9064208bff
--- /dev/null
+++ b/src/mainboard/google/volteer/variants/collis/Makefile.inc
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+romstage-y += memory.c
diff --git a/src/mainboard/google/volteer/variants/collis/memory.c b/src/mainboard/google/volteer/variants/collis/memory.c
new file mode 100644
index 0000000000..b4414d4019
--- /dev/null
+++ b/src/mainboard/google/volteer/variants/collis/memory.c
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/variants.h>
+
+static const struct mb_cfg board_memcfg = {
+	.type = MEM_TYPE_LP4X,
+
+	/* DQ byte map */
+	.lp4x_dq_map = {
+		.ddr0 = {
+			.dq0 = { 7,  3,  1,  4,  0,  5,  2,  6, }, /* DDR0_DQ0[7:0] */
+			.dq1 = { 13, 14, 8,  10, 9,  15, 11, 12 }, /* DDR0_DQ1[7:0] */
+		},
+		.ddr1 = {
+			.dq0 = { 1,  2,  7,  6,  3,  5,  4,  0, }, /* DDR1_DQ0[7:0] */
+			.dq1 = { 14, 15, 13, 10,  8, 11, 12, 9  }, /* DDR1_DQ1[7:0] */
+		},
+		.ddr2 = {
+			.dq0 = { 11, 15, 10, 9,  8, 12, 13, 14, }, /* DDR2_DQ0[7:0] */
+			.dq1 = { 5,  6,  4,  0,  7,  2,  3,  1  }, /* DDR2_DQ1[7:0] */
+		},
+		.ddr3 = {
+			.dq0 = { 11, 15, 10, 9, 13, 12, 14,  8, }, /* DDR3_DQ0[7:0] */
+			.dq1 = { 0,  5,  6,  4,  1,  2,  7,  3  }, /* DDR3_DQ1[7:0] */
+		},
+		.ddr4 = {
+			.dq0 = { 7,  2,  3,  1,  4,  0,  5,  6, }, /* DDR4_DQ0[7:0] */
+			.dq1 = { 13, 14,  8, 12, 10,  9, 15, 11 }, /* DDR4_DQ1[7:0] */
+		},
+		.ddr5 = {
+			.dq0 = { 7,  3,  2,  1,  6,  4,  0,  5, }, /* DDR5_DQ0[7:0] */
+			.dq1 = { 15, 14, 12, 8, 11, 13,  9,  10 }, /* DDR5_DQ1[7:0] */
+		},
+		.ddr6 = {
+			.dq0 = { 11, 10, 15, 12, 8,  9, 14, 13, }, /* DDR6_DQ0[7:0] */
+			.dq1 = { 6,  0,  5,  4,  3,  2,  7,  1  }, /* DDR6_DQ1[7:0] */
+		},
+		.ddr7 = {
+			.dq0 = { 9, 10, 11,  8, 12, 14, 13, 15, }, /* DDR7_DQ0[7:0] */
+			.dq1 = { 0,  5,  4,  7,  1,  6,  3,  2  }, /* DDR7_DQ1[7:0] */
+		},
+	},
+
+	/* DQS CPU<>DRAM map */
+	.lp4x_dqs_map = {
+		.ddr0 = { .dqs0 = 0, .dqs1 = 1 },  /* DDR0_DQS[1:0] */
+		.ddr1 = { .dqs0 = 0, .dqs1 = 1 },  /* DDR1_DQS[1:0] */
+		.ddr2 = { .dqs0 = 1, .dqs1 = 0 },  /* DDR2_DQS[1:0] */
+		.ddr3 = { .dqs0 = 1, .dqs1 = 0 },  /* DDR3_DQS[1:0] */
+		.ddr4 = { .dqs0 = 0, .dqs1 = 1 },  /* DDR4_DQS[1:0] */
+		.ddr5 = { .dqs0 = 0, .dqs1 = 1 },  /* DDR5_DQS[1:0] */
+		.ddr6 = { .dqs0 = 1, .dqs1 = 0 },  /* DDR6_DQS[1:0] */
+		.ddr7 = { .dqs0 = 1, .dqs1 = 0 },  /* DDR7_DQS[1:0] */
+	},
+
+	.ect = true, /* Enable Early Command Training */
+};
+
+const struct mb_cfg *variant_memory_params(void)
+{
+	return &board_memcfg;
+}
diff --git a/src/mainboard/google/volteer/variants/collis/memory/Makefile.inc b/src/mainboard/google/volteer/variants/collis/memory/Makefile.inc
index b0ca2223a8..7b9a85e0d6 100644
--- a/src/mainboard/google/volteer/variants/collis/memory/Makefile.inc
+++ b/src/mainboard/google/volteer/variants/collis/memory/Makefile.inc
@@ -1,5 +1,7 @@
 ## SPDX-License-Identifier: GPL-2.0-or-later
 ## This is an auto-generated file. Do not edit!!
-## Add memory parts in mem_parts_used.txt and run spd_tools to regenerate.
 
-SPD_SOURCES = placeholder.spd.hex
+SPD_SOURCES =
+SPD_SOURCES += lp4x-spd-1.hex      # ID = 0(0b0000)  Parts = MT53D512M64D4NW-046 WT:F, H9HCNNNCRMBLPR-NEE
+SPD_SOURCES += lp4x-spd-4.hex      # ID = 1(0b0001)  Parts = MT53D1G64D4NW-046 WT:A
+SPD_SOURCES += lp4x-spd-3.hex      # ID = 2(0b0010)  Parts = H9HCNNNFBMBLPR-NEE
diff --git a/src/mainboard/google/volteer/variants/collis/memory/dram_id.generated.txt b/src/mainboard/google/volteer/variants/collis/memory/dram_id.generated.txt
index fa247902ee..413301e52c 100644
--- a/src/mainboard/google/volteer/variants/collis/memory/dram_id.generated.txt
+++ b/src/mainboard/google/volteer/variants/collis/memory/dram_id.generated.txt
@@ -1 +1,5 @@
 DRAM Part Name                 ID to assign
+MT53D512M64D4NW-046 WT:F       0 (0000)
+H9HCNNNCRMBLPR-NEE             0 (0000)
+MT53D1G64D4NW-046 WT:A         1 (0001)
+H9HCNNNFBMBLPR-NEE             2 (0010)
diff --git a/src/mainboard/google/volteer/variants/collis/memory/mem_list_variant.txt b/src/mainboard/google/volteer/variants/collis/memory/mem_list_variant.txt
new file mode 100644
index 0000000000..c1d262300c
--- /dev/null
+++ b/src/mainboard/google/volteer/variants/collis/memory/mem_list_variant.txt
@@ -0,0 +1,4 @@
+MT53D512M64D4NW-046 WT:F
+H9HCNNNCRMBLPR-NEE
+MT53D1G64D4NW-046 WT:A
+H9HCNNNFBMBLPR-NEE