2 files changed, 104 insertions, 0 deletions
diff --git a/src/mainboard/google/brox/variants/lotso/Makefile.mk b/src/mainboard/google/brox/variants/lotso/Makefile.mk
index 91f031e7a4..48683172d6 100644
--- a/src/mainboard/google/brox/variants/lotso/Makefile.mk
+++ b/src/mainboard/google/brox/variants/lotso/Makefile.mk
@@ -1,5 +1,6 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
 bootblock-y += gpio.c
+romstage-y += memory.c
 romstage-y += gpio.c
 ramstage-y += gpio.c
diff --git a/src/mainboard/google/brox/variants/lotso/memory.c b/src/mainboard/google/brox/variants/lotso/memory.c
new file mode 100644
index 0000000000..0765d5e57e
--- /dev/null
+++ b/src/mainboard/google/brox/variants/lotso/memory.c
@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <gpio.h>
+
+static const struct mb_cfg baseboard_memcfg = {
+	.type = MEM_TYPE_LP5X,
+
+	/* Leave Rcomp unspecified to use the FSP optimized defaults */
+
+	/* DQ byte map */
+	.lpx_dq_map = {
+		.ddr0 = {
+			.dq0 = { 13, 15, 14, 12, 11, 9, 10, 8 },
+			.dq1 = {  3,  0,  2,  1,  6, 7,  5, 4 },
+		},
+		.ddr1 = {
+			.dq0 = {  2,  0,  1,  3,  6,  4, 7, 5 },
+			.dq1 = { 13, 15, 12, 14, 10, 11, 8, 9 },
+		},
+		.ddr2 = {
+			.dq0 = { 14, 13, 12, 15, 9, 10, 11, 8 },
+			.dq1 = {  4,  6,  7,  5, 1,  2,  0, 3 },
+		},
+		.ddr3 = {
+			.dq0 = { 14, 13, 15, 12, 8, 11, 9, 10 },
+			.dq1 = {  0,  2,  1,  3, 6,  5, 7,  4 },
+		},
+		.ddr4 = {
+			.dq0 = { 8, 11, 10, 9, 14, 15, 13, 12 },
+			.dq1 = { 3,  0,  2, 1,  5,  7,  4,  6 },
+		},
+		.ddr5 = {
+			.dq0 = {  2,  1,  3,  0,  6, 4, 7,  5 },
+			.dq1 = { 12, 13, 15, 14, 10, 9, 8, 11 },
+		},
+		.ddr6 = {
+			.dq0 = {  1,  0,  3,  2, 5,  7,  6, 4 },
+			.dq1 = { 15, 13, 12, 14, 8, 11, 10, 9 },
+		},
+		.ddr7 = {
+			.dq0 = {  3,  2, 1,  0,  7, 4,  5,  6 },
+			.dq1 = { 14, 15, 9, 11, 12, 8, 10, 13 },
+		},
+	},
+
+	/* DQS CPU<>DRAM map */
+	.lpx_dqs_map = {
+		.ddr0 = { .dqs0 = 1, .dqs1 = 0 },
+		.ddr1 = { .dqs0 = 0, .dqs1 = 1 },
+		.ddr2 = { .dqs0 = 1, .dqs1 = 0 },
+		.ddr3 = { .dqs0 = 1, .dqs1 = 0 },
+		.ddr4 = { .dqs0 = 1, .dqs1 = 0 },
+		.ddr5 = { .dqs0 = 0, .dqs1 = 1 },
+		.ddr6 = { .dqs0 = 0, .dqs1 = 1 },
+		.ddr7 = { .dqs0 = 0, .dqs1 = 1 },
+	},
+
+	.lp5x_config = {
+		.ccc_config = 0xff,
+	},
+
+	.LpDdrDqDqsReTraining = 1,
+
+	.ect = 1, /* Early Command Training */
+};
+
+const struct mb_cfg *variant_memory_params(void)
+{
+	return &baseboard_memcfg;
+}
+
+int variant_memory_sku(void)
+{
+	/*
+	 * Memory configuration board straps
+	 * MEM_STRAP_0	GPP_S4
+	 * MEM_STRAP_1	GPP_S5
+	 * MEM_STRAP_2	GPP_S6
+	 * MEM_STRAP_3	GPP_S7
+	 */
+	gpio_t spd_gpios[] = {
+		GPP_S4,
+		GPP_S5,
+		GPP_S6,
+		GPP_S7,
+	};
+
+	return gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
+}
+
+bool variant_is_half_populated(void)
+{
+	/* MEM_CH_SEL GPP_S0 */
+	return gpio_get(GPP_S0);
+}
+
+void variant_get_spd_info(struct mem_spd *spd_info)
+{
+	spd_info->topo = MEM_TOPO_MEMORY_DOWN;
+	spd_info->cbfs_index = variant_memory_sku();
+}