soc/intel/xeon_sp: Share DDR codes across Xeon-SP platforms

DDR support codes across generations are similar. Share the codes
to improve code reuse.

TEST=intel/archercity CRB

Change-Id: I237d561003671d70dfaaa9823a0cf16d6e1f50cf
Signed-off-by: Jincheng Li <jincheng.li@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81219
Reviewed-by: Shuo Liu <shuo.liu@intel.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>

10 files changed, 170 insertions, 300 deletions

diff --git a/src/soc/intel/xeon_sp/Makefile.mk b/src/soc/intel/xeon_sp/Makefile.mk
index 58915447b7..1f96bb7f3b 100644
--- a/src/soc/intel/xeon_sp/Makefile.mk
+++ b/src/soc/intel/xeon_sp/Makefile.mk
@@ -7,7 +7,7 @@ subdirs-$(CONFIG_SOC_INTEL_COOPERLAKE_SP) += cpx lbg
 subdirs-$(CONFIG_SOC_INTEL_SAPPHIRERAPIDS_SP) += spr ebg
 
 bootblock-y += bootblock.c spi.c lpc.c pch.c report_platform.c
-romstage-y += romstage.c reset.c util.c spi.c pmutil.c memmap.c
+romstage-y += romstage.c reset.c util.c spi.c pmutil.c memmap.c ddr.c
 romstage-y += ../../../cpu/intel/car/romstage.c
 ramstage-y += uncore.c reset.c util.c lpc.c spi.c ramstage.c chip_common.c
 ramstage-y += memmap.c pch.c lockdown.c finalize.c
diff --git a/src/soc/intel/xeon_sp/cpx/Makefile.mk b/src/soc/intel/xeon_sp/cpx/Makefile.mk
index 911cf66e4a..095ad59af4 100644
--- a/src/soc/intel/xeon_sp/cpx/Makefile.mk
+++ b/src/soc/intel/xeon_sp/cpx/Makefile.mk
@@ -5,7 +5,7 @@ ifeq ($(CONFIG_SOC_INTEL_COOPERLAKE_SP),y)
 subdirs-y += ../../../../cpu/intel/turbo
 subdirs-y += ../../../../cpu/intel/microcode
 
-romstage-y += romstage.c ddr.c soc_util.c
+romstage-y += romstage.c soc_util.c
 romstage-$(CONFIG_DISPLAY_UPD_DATA) += upd_display.c
 romstage-$(CONFIG_DISPLAY_HOBS) += hob_display.c
 
diff --git a/src/soc/intel/xeon_sp/cpx/ddr.c b/src/soc/intel/xeon_sp/cpx/ddr.c
deleted file mode 100644
index 990711f090..0000000000
--- a/src/soc/intel/xeon_sp/cpx/ddr.c
+++ /dev/null
@@ -1,89 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#include <soc/ddr.h>
-
-uint32_t get_ddr_voltage(uint8_t DdrVoltage)
-{
-	/* SPD Byte 11: Module Nominal Voltage, currently DDR4 only supports 1.2V.
-	   Either Bit 0 or Bit 1 is set, return 1.2V */
-	if (DdrVoltage & 0x3)
-		return 1200;
-	return 0;
-}
-
-uint16_t get_max_memory_speed(uint32_t commonTck)
-{
-	if (commonTck <= DDR_8400_TCK_MIN)
-		return 8400;
-	else if (commonTck <= DDR_6400_TCK_MIN)
-		return 6400;
-	else if (commonTck <= DDR_6000_TCK_MIN)
-		return 6000;
-	else if (commonTck <= DDR_5600_TCK_MIN)
-		return 5600;
-	else if (commonTck <= DDR_5200_TCK_MIN)
-		return 5200;
-	else if (commonTck <= DDR_4800_TCK_MIN)
-		return 4800;
-	else if (commonTck <= DDR_4400_TCK_MIN)
-		return 4400;
-	else if (commonTck <= DDR_4266_TCK_MIN)
-		return 4266;
-	else if (commonTck <= DDR_4200_TCK_MIN)
-		return 4200;
-	else if (commonTck <= DDR_4000_TCK_MIN)
-		return 4000;
-	else if (commonTck <= DDR_3800_TCK_MIN)
-		return 3800;
-	else if (commonTck <= DDR_3733_TCK_MIN)
-		return 3733;
-	else if (commonTck <= DDR_3600_TCK_MIN)
-		return 3600;
-	else if (commonTck <= DDR_3466_TCK_MIN)
-		return 3466;
-	else if (commonTck <= DDR_3400_TCK_MIN)
-		return 3400;
-	else if (commonTck <= DDR_3200_TCK_MIN)
-		return 3200;
-	else if (commonTck <= DDR_3000_TCK_MIN)
-		return 3000;
-	else if (commonTck <= DDR_2933_TCK_MIN)
-		return 2933;
-	else if (commonTck <= DDR_2800_TCK_MIN)
-		return 2800;
-	else if (commonTck <= DDR_2666_TCK_MIN)
-		return 2666;
-	else if (commonTck <= DDR_2600_TCK_MIN)
-		return 2600;
-	else if (commonTck <= DDR_2400_TCK_MIN)
-		return 2400;
-	else if (commonTck <= DDR_2200_TCK_MIN)
-		return 2200;
-	else if (commonTck <= DDR_2133_TCK_MIN)
-		return 2133;
-	else if (commonTck <= DDR_2000_TCK_MIN)
-		return 2000;
-	else if (commonTck <= DDR_1866_TCK_MIN)
-		return 1866;
-	else if (commonTck <= DDR_1800_TCK_MIN)
-		return 1800;
-	else if (commonTck <= DDR_1600_TCK_MIN)
-		return 1600;
-	else if (commonTck <= DDR_1400_TCK_MIN)
-		return 1400;
-	else if (commonTck <= DDR_1333_TCK_MIN)
-		return 1333;
-	else if (commonTck <= DDR_1200_TCK_MIN)
-		return 1200;
-	else if (commonTck <= DDR_1066_TCK_MIN)
-		return 1066;
-	else if (commonTck <= DDR_1000_TCK_MIN)
-		return 1000;
-	else
-		return 800;
-}
-
-__weak bool mainboard_dimm_slot_exists(uint8_t socket, uint8_t channel, uint8_t slot)
-{
-	return false;
-}
diff --git a/src/soc/intel/xeon_sp/cpx/include/soc/ddr.h b/src/soc/intel/xeon_sp/cpx/include/soc/ddr.h
deleted file mode 100644
index 0ef6ded124..0000000000
--- a/src/soc/intel/xeon_sp/cpx/include/soc/ddr.h
+++ /dev/null
@@ -1,53 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#ifndef _CPX_DDR_H_
-#define _CPX_DDR_H_
-
-#include <types.h>
-
-/* DDR_*_TCK_MIN are in picoseconds */
-#define DDR_800_TCK_MIN                 2500
-#define DDR_1000_TCK_MIN                2000
-#define DDR_1066_TCK_MIN                1875
-#define DDR_1200_TCK_MIN                1667
-#define DDR_1333_TCK_MIN                1500
-#define DDR_1400_TCK_MIN                1429
-#define DDR_1600_TCK_MIN                1250
-#define DDR_1800_TCK_MIN                1110
-#define DDR_1866_TCK_MIN                1071
-#define DDR_2000_TCK_MIN                1000
-#define DDR_2133_TCK_MIN                938
-#define DDR_2200_TCK_MIN                909
-#define DDR_2400_TCK_MIN                833
-#define DDR_2600_TCK_MIN                769
-#define DDR_2666_TCK_MIN                750
-#define DDR_2800_TCK_MIN                714
-#define DDR_2933_TCK_MIN                682
-#define DDR_3000_TCK_MIN                667
-#define DDR_3200_TCK_MIN                625
-#define DDR_3400_TCK_MIN                589
-#define DDR_3466_TCK_MIN                577
-#define DDR_3600_TCK_MIN                556
-#define DDR_3733_TCK_MIN                536
-#define DDR_3800_TCK_MIN                527
-#define DDR_4000_TCK_MIN                500
-#define DDR_4200_TCK_MIN                477
-#define DDR_4266_TCK_MIN                469
-#define DDR_4400_TCK_MIN                455
-#define DDR_4800_TCK_MIN                417
-#define DDR_5200_TCK_MIN                385
-#define DDR_5600_TCK_MIN                358
-#define DDR_6000_TCK_MIN                334
-#define DDR_6400_TCK_MIN                313
-#define DDR_6800_TCK_MIN                295
-#define DDR_7200_TCK_MIN                278
-#define DDR_7600_TCK_MIN                264
-#define DDR_8000_TCK_MIN                250
-#define DDR_8400_TCK_MIN                239
-
-uint16_t get_max_memory_speed(uint32_t commonTck);
-uint32_t get_ddr_voltage(uint8_t DdrVoltage);
-
-bool mainboard_dimm_slot_exists(uint8_t socket, uint8_t channel, uint8_t slot);
-
-#endif /* _CPX_DDR_H_ */
diff --git a/src/soc/intel/xeon_sp/ddr.c b/src/soc/intel/xeon_sp/ddr.c
new file mode 100644
index 0000000000..de248ca13b
--- /dev/null
+++ b/src/soc/intel/xeon_sp/ddr.c
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <soc/ddr.h>
+
+uint32_t get_ddr_voltage(uint8_t ddr_voltage)
+{
+	/* SPD Byte 11: Module Nominal Voltage, currently DDR4 only supports 1.2V.
+	   Either Bit 0 or Bit 1 is set, return 1.2V */
+	if (ddr_voltage & 0x3)
+		return 1200;
+	return 0;
+}
+
+unsigned int get_ddr_millivolt(unsigned int ddr_voltage)
+{
+	switch (ddr_voltage) {
+	case SPD_VDD_DDR4:
+		return 1200;
+	case SPD_VDD_DDR5:
+		return 1100;
+	default:
+		return 0;
+	}
+}
+
+unsigned int get_max_memory_speed(unsigned int common_tck)
+{
+	if (common_tck <= DDR_8400_TCK_MIN)
+		return 8400;
+	else if (common_tck <= DDR_7600_TCK_MIN)
+		return 7600;
+	else if (common_tck <= DDR_7200_TCK_MIN)
+		return 7200;
+	else if (common_tck <= DDR_6800_TCK_MIN)
+		return 6800;
+	else if (common_tck <= DDR_6400_TCK_MIN)
+		return 6400;
+	else if (common_tck <= DDR_6000_TCK_MIN)
+		return 6000;
+	else if (common_tck <= DDR_5600_TCK_MIN)
+		return 5600;
+	else if (common_tck <= DDR_5200_TCK_MIN)
+		return 5200;
+	else if (common_tck <= DDR_4800_TCK_MIN)
+		return 4800;
+	else if (common_tck <= DDR_4400_TCK_MIN)
+		return 4400;
+	else if (common_tck <= DDR_4266_TCK_MIN)
+		return 4266;
+	else if (common_tck <= DDR_4200_TCK_MIN)
+		return 4200;
+	else if (common_tck <= DDR_4000_TCK_MIN)
+		return 4000;
+	else if (common_tck <= DDR_3800_TCK_MIN)
+		return 3800;
+	else if (common_tck <= DDR_3733_TCK_MIN)
+		return 3733;
+	else if (common_tck <= DDR_3600_TCK_MIN)
+		return 3600;
+	else if (common_tck <= DDR_3466_TCK_MIN)
+		return 3466;
+	else if (common_tck <= DDR_3400_TCK_MIN)
+		return 3400;
+	else if (common_tck <= DDR_3200_TCK_MIN)
+		return 3200;
+	else if (common_tck <= DDR_3000_TCK_MIN)
+		return 3000;
+	else if (common_tck <= DDR_2933_TCK_MIN)
+		return 2933;
+	else if (common_tck <= DDR_2800_TCK_MIN)
+		return 2800;
+	else if (common_tck <= DDR_2666_TCK_MIN)
+		return 2666;
+	else if (common_tck <= DDR_2600_TCK_MIN)
+		return 2600;
+	else if (common_tck <= DDR_2400_TCK_MIN)
+		return 2400;
+	else if (common_tck <= DDR_2200_TCK_MIN)
+		return 2200;
+	else if (common_tck <= DDR_2133_TCK_MIN)
+		return 2133;
+	else if (common_tck <= DDR_2000_TCK_MIN)
+		return 2000;
+	else if (common_tck <= DDR_1866_TCK_MIN)
+		return 1866;
+	else if (common_tck <= DDR_1800_TCK_MIN)
+		return 1800;
+	else if (common_tck <= DDR_1600_TCK_MIN)
+		return 1600;
+	else if (common_tck <= DDR_1400_TCK_MIN)
+		return 1400;
+	else if (common_tck <= DDR_1333_TCK_MIN)
+		return 1333;
+	else if (common_tck <= DDR_1200_TCK_MIN)
+		return 1200;
+	else if (common_tck <= DDR_1066_TCK_MIN)
+		return 1066;
+	else if (common_tck <= DDR_1000_TCK_MIN)
+		return 1000;
+	else
+		return 800;
+}
+
+__weak bool mainboard_dimm_slot_exists(uint8_t socket, uint8_t channel, uint8_t slot)
+{
+	return false;
+}
diff --git a/src/soc/intel/xeon_sp/include/soc/ddr.h b/src/soc/intel/xeon_sp/include/soc/ddr.h
new file mode 100644
index 0000000000..bb10caaf1f
--- /dev/null
+++ b/src/soc/intel/xeon_sp/include/soc/ddr.h
@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef _SOC_DDR_H_
+#define _SOC_DDR_H_
+
+#include <types.h>
+
+/* SPD Byte 11: Module Nominal Voltage
+ * currently DDR4 only supports 1.2V, DDR5 only supports 1.1V. */
+#define SPD_VDD_DDR4 3
+#define SPD_VDD_DDR5 0
+#define SPD_TYPE_DDR5 0x12
+
+/* DDR_*_TCK_MIN are in picoseconds */
+#define DDR_800_TCK_MIN                2500
+#define DDR_1000_TCK_MIN               2000
+#define DDR_1066_TCK_MIN               1875
+#define DDR_1200_TCK_MIN               1667
+#define DDR_1333_TCK_MIN               1500
+#define DDR_1400_TCK_MIN               1429
+#define DDR_1600_TCK_MIN               1250
+#define DDR_1800_TCK_MIN               1110
+#define DDR_1866_TCK_MIN               1071
+#define DDR_2000_TCK_MIN               1000
+#define DDR_2133_TCK_MIN               938
+#define DDR_2200_TCK_MIN               909
+#define DDR_2400_TCK_MIN               833
+#define DDR_2600_TCK_MIN               769
+#define DDR_2666_TCK_MIN               750
+#define DDR_2800_TCK_MIN               714
+#define DDR_2933_TCK_MIN               682
+#define DDR_3000_TCK_MIN               667
+#define DDR_3200_TCK_MIN               625
+#define DDR_3400_TCK_MIN               589
+#define DDR_3466_TCK_MIN               577
+#define DDR_3600_TCK_MIN               556
+#define DDR_3733_TCK_MIN               536
+#define DDR_3800_TCK_MIN               527
+#define DDR_4000_TCK_MIN               500
+#define DDR_4200_TCK_MIN               477
+#define DDR_4266_TCK_MIN               469
+#define DDR_4400_TCK_MIN               455
+#define DDR_4800_TCK_MIN               417
+#define DDR_5200_TCK_MIN               385
+#define DDR_5600_TCK_MIN               358
+#define DDR_6000_TCK_MIN               334
+#define DDR_6400_TCK_MIN               313
+#define DDR_6800_TCK_MIN               295
+#define DDR_7200_TCK_MIN               278
+#define DDR_7600_TCK_MIN               264
+#define DDR_8000_TCK_MIN               250
+#define DDR_8400_TCK_MIN               239
+
+unsigned int get_max_memory_speed(unsigned int commonTck);
+unsigned int get_ddr_millivolt(unsigned int ddr_voltage);
+uint32_t get_ddr_voltage(uint8_t DdrVoltage);
+
+bool mainboard_dimm_slot_exists(uint8_t socket, uint8_t channel, uint8_t slot);
+
+#endif /* _SOC_DDR_H_ */
diff --git a/src/soc/intel/xeon_sp/spr/Makefile.mk b/src/soc/intel/xeon_sp/spr/Makefile.mk
index fc8ab1713d..d999f30661 100644
--- a/src/soc/intel/xeon_sp/spr/Makefile.mk
+++ b/src/soc/intel/xeon_sp/spr/Makefile.mk
@@ -8,7 +8,7 @@ subdirs-y += ../../../../cpu/x86/mtrr
 subdirs-y += ../../../../cpu/x86/tsc
 subdirs-y += ../../../../cpu/intel/microcode
 
-romstage-y += romstage.c soc_util.c ddr.c
+romstage-y += romstage.c soc_util.c
 romstage-$(CONFIG_DISPLAY_HOBS) += hob_display.c
 romstage-$(CONFIG_DISPLAY_UPD_DATA) += upd_display.c
 
diff --git a/src/soc/intel/xeon_sp/spr/ddr.c b/src/soc/intel/xeon_sp/spr/ddr.c
deleted file mode 100644
index ff61a7e8a4..0000000000
--- a/src/soc/intel/xeon_sp/spr/ddr.c
+++ /dev/null
@@ -1,93 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#include <soc/ddr.h>
-
-unsigned int get_ddr_millivolt(unsigned int ddr_voltage)
-{
-	switch (ddr_voltage) {
-	case SPD_VDD_DDR4:
-		return 1200;
-	case SPD_VDD_DDR5:
-		return 1100;
-	default:
-		return 0;
-	}
-}
-
-unsigned int get_max_memory_speed(unsigned int commonTck)
-{
-	if (commonTck <= DDR_8400_TCK_MIN)
-		return 8400;
-	else if (commonTck <= DDR_7600_TCK_MIN)
-		return 7600;
-	else if (commonTck <= DDR_7200_TCK_MIN)
-		return 7200;
-	else if (commonTck <= DDR_6800_TCK_MIN)
-		return 6800;
-	else if (commonTck <= DDR_6400_TCK_MIN)
-		return 6400;
-	else if (commonTck <= DDR_6000_TCK_MIN)
-		return 6000;
-	else if (commonTck <= DDR_5600_TCK_MIN)
-		return 5600;
-	else if (commonTck <= DDR_5200_TCK_MIN)
-		return 5200;
-	else if (commonTck <= DDR_4800_TCK_MIN)
-		return 4800;
-	else if (commonTck <= DDR_4400_TCK_MIN)
-		return 4400;
-	else if (commonTck <= DDR_4266_TCK_MIN)
-		return 4266;
-	else if (commonTck <= DDR_4200_TCK_MIN)
-		return 4200;
-	else if (commonTck <= DDR_4000_TCK_MIN)
-		return 4000;
-	else if (commonTck <= DDR_3800_TCK_MIN)
-		return 3800;
-	else if (commonTck <= DDR_3733_TCK_MIN)
-		return 3733;
-	else if (commonTck <= DDR_3600_TCK_MIN)
-		return 3600;
-	else if (commonTck <= DDR_3466_TCK_MIN)
-		return 3466;
-	else if (commonTck <= DDR_3400_TCK_MIN)
-		return 3400;
-	else if (commonTck <= DDR_3200_TCK_MIN)
-		return 3200;
-	else if (commonTck <= DDR_3000_TCK_MIN)
-		return 3000;
-	else if (commonTck <= DDR_2933_TCK_MIN)
-		return 2933;
-	else if (commonTck <= DDR_2800_TCK_MIN)
-		return 2800;
-	else if (commonTck <= DDR_2666_TCK_MIN)
-		return 2666;
-	else if (commonTck <= DDR_2600_TCK_MIN)
-		return 2600;
-	else if (commonTck <= DDR_2400_TCK_MIN)
-		return 2400;
-	else if (commonTck <= DDR_2200_TCK_MIN)
-		return 2200;
-	else if (commonTck <= DDR_2133_TCK_MIN)
-		return 2133;
-	else if (commonTck <= DDR_2000_TCK_MIN)
-		return 2000;
-	else if (commonTck <= DDR_1866_TCK_MIN)
-		return 1866;
-	else if (commonTck <= DDR_1800_TCK_MIN)
-		return 1800;
-	else if (commonTck <= DDR_1600_TCK_MIN)
-		return 1600;
-	else if (commonTck <= DDR_1400_TCK_MIN)
-		return 1400;
-	else if (commonTck <= DDR_1333_TCK_MIN)
-		return 1333;
-	else if (commonTck <= DDR_1200_TCK_MIN)
-		return 1200;
-	else if (commonTck <= DDR_1066_TCK_MIN)
-		return 1066;
-	else if (commonTck <= DDR_1000_TCK_MIN)
-		return 1000;
-	else
-		return 800;
-}
diff --git a/src/soc/intel/xeon_sp/spr/include/soc/ddr.h b/src/soc/intel/xeon_sp/spr/include/soc/ddr.h
deleted file mode 100644
index f2dc5c8998..0000000000
--- a/src/soc/intel/xeon_sp/spr/include/soc/ddr.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-#ifndef _SPR_DDR_H_
-#define _SPR_DDR_H_
-
-#include <types.h>
-
-/* SPD Byte 11: Module Nominal Voltage
- * currently DDR4 only supports 1.2V, DDR5 only supports 1.1V. */
-#define SPD_VDD_DDR4 3
-#define SPD_VDD_DDR5 0
-#define SPD_TYPE_DDR5 0x12
-
-/* DDR_*_TCK_MIN are in picoseconds */
-#define DDR_1000_TCK_MIN 2000
-#define DDR_1066_TCK_MIN 1875
-#define DDR_1200_TCK_MIN 1667
-#define DDR_1333_TCK_MIN 1500
-#define DDR_1400_TCK_MIN 1429
-#define DDR_1600_TCK_MIN 1250
-#define DDR_1800_TCK_MIN 1110
-#define DDR_1866_TCK_MIN 1071
-#define DDR_2000_TCK_MIN 1000
-#define DDR_2133_TCK_MIN 938
-#define DDR_2200_TCK_MIN 909
-#define DDR_2400_TCK_MIN 833
-#define DDR_2600_TCK_MIN 769
-#define DDR_2666_TCK_MIN 750
-#define DDR_2800_TCK_MIN 714
-#define DDR_2933_TCK_MIN 682
-#define DDR_3000_TCK_MIN 667
-#define DDR_3200_TCK_MIN 625
-#define DDR_3400_TCK_MIN 589
-#define DDR_3466_TCK_MIN 577
-#define DDR_3600_TCK_MIN 556
-#define DDR_3733_TCK_MIN 536
-#define DDR_3800_TCK_MIN 527
-#define DDR_4000_TCK_MIN 500
-#define DDR_4200_TCK_MIN 477
-#define DDR_4266_TCK_MIN 469
-#define DDR_4400_TCK_MIN 455
-#define DDR_4800_TCK_MIN 417
-#define DDR_5200_TCK_MIN 385
-#define DDR_5600_TCK_MIN 358
-#define DDR_6000_TCK_MIN 334
-#define DDR_6400_TCK_MIN 313
-#define DDR_6800_TCK_MIN 295
-#define DDR_7200_TCK_MIN 278
-#define DDR_7600_TCK_MIN 264
-#define DDR_8000_TCK_MIN 250
-#define DDR_8400_TCK_MIN 239
-
-unsigned int get_max_memory_speed(unsigned int commonTck);
-unsigned int get_ddr_millivolt(unsigned int ddr_voltage);
-bool mainboard_dimm_slot_exists(uint8_t socket, uint8_t channel, uint8_t slot);
-
-#endif /* _SPR_DDR_H_ */
diff --git a/src/soc/intel/xeon_sp/spr/romstage.c b/src/soc/intel/xeon_sp/spr/romstage.c
index 74976b362e..3b38828492 100644
--- a/src/soc/intel/xeon_sp/spr/romstage.c
+++ b/src/soc/intel/xeon_sp/spr/romstage.c
@@ -32,11 +32,6 @@ void __weak mainboard_memory_init_params(FSPM_UPD *mupd)
 	/* Default weak implementation */
 }
 
-bool __weak mainboard_dimm_slot_exists(uint8_t socket, uint8_t channel, uint8_t dimm)
-{
-	return false;
-}
-
 /*
  * Search from VPD_RW first then VPD_RO for UPD config variables,
  * overwrites them from VPD if it's found.