Fix inclusion of SPD information

src/mainboard/system76/lemp9/Makefile.inc

@@ -1,4 +1,3 @@
 bootblock-y += bootblock.c
 ramstage-y += ramstage.c hda_verb.c
-
-SPD_SOURCES  = samsung-K4AAG165WA-BCTD
+subdirs-y += spd

src/mainboard/system76/lemp9/spd/Makefile.inc

@@ -0,0 +1,37 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2019 System76
+## Copyright (C) 2018 Intel Corporation.
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+SPD_SOURCES  = samsung-K4AAG165WA-BCTD
+
+SPD_BIN = $(obj)/spd.bin
+
+ifeq ($(SPD_SOURCES),)
+	SPD_DEPS := $(error SPD_SOURCES is not set. Variant must provide this)
+else
+	SPD_DEPS := $(foreach f, $(SPD_SOURCES), src/mainboard/$(MAINBOARDDIR)/spd/$(f).spd.hex)
+endif
+
+# Include spd ROM data
+$(SPD_BIN): $(SPD_DEPS)
+	for f in $+; \
+	  do for c in $$(cat $$f | grep -v ^#); \
+	    do printf $$(printf '\\%o' 0x$$c); \
+	  done; \
+	done > $@
+
+cbfs-files-y += spd.bin
+spd.bin-file := $(SPD_BIN)
+spd.bin-type := spd