templates: add an empty SPD to SPD_SOURCES

Add an empty SPD in SPD_SOURCES when creating a new variant of
hatch, volteer, waddledee, or waddledoo, so that coreboot can build
successfully.

For variants that use spd_tools, add an empty mem_parts_used.txt so
that the developer can add the supported memory parts and regenerate
the Makefile.inc with the correct SPD references.

Add an empty SPD for LPDDR4x for waddledee and waddledoo to use.

BUG=b:169422833
TEST=create a new variant of hatch, volteer, waddledee, and waddledoo.
Observe that each one succeeds.

Signed-off-by: Paul Fagerburg <pfagerburg@google.com>
Change-Id: I06dfb6103701bf8949180595f1e98fac48bcc585
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45746
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/util/mainboard/google/waddledee/template/memory/mem_parts_used.txt b/util/mainboard/google/waddledee/template/memory/mem_parts_used.txt
new file mode 100644
index 0000000000..59381dcf5b
--- /dev/null
+++ b/util/mainboard/google/waddledee/template/memory/mem_parts_used.txt
@@ -0,0 +1,6 @@
+# This is a CSV file containing a list of memory parts used by this variant.
+# Generate an updated Makefile.inc and dram_id.generated.txt by running the
+# gen_part_id tool from util/spd_tools/lp4x
+# See util/spd_tools/lp4x/README.md for more details and instructions.
+
+# Part Name