mb, soc: change mainboard_get_dram_part_num() prototype

Change mainboard_get_dram_part_num() to return a constant character
pointer to a null-terminated C string and to take no input
parameters.  This also addresses the issue that different SOCs and
motherboards were using different definitions for
mainboard_get_dram_part_num by consolidating to a single definition.

BUG=b:169774661, b:168724473
TEST="emerge-volteer coreboot && emerge-dedede coreboot && emerge-hatch
coreboot" and verify build completes successfully.

Change-Id: Ie7664eab65a2b9e25b7853bf68baf2525b040487
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45873
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/src/mainboard/google/hatch/romstage_spd_cbfs.c b/src/mainboard/google/hatch/romstage_spd_cbfs.c
index a9a65e90af..b8937de91b 100644
--- a/src/mainboard/google/hatch/romstage_spd_cbfs.c
+++ b/src/mainboard/google/hatch/romstage_spd_cbfs.c
@@ -57,7 +57,7 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	cannonlake_memcfg_init(&memupd->FspmConfig, &memcfg);
 }
 
-void mainboard_get_dram_part_num(const char **part_num, size_t *len)
+const char *mainboard_get_dram_part_num(void)
 {
 	static char part_num_store[DIMM_INFO_PART_NUMBER_SIZE];
 	static enum {
@@ -77,8 +77,7 @@ void mainboard_get_dram_part_num(const char **part_num, size_t *len)
 	}
 
 	if (part_num_state == PART_NUM_NOT_IN_CBI)
-		return;
+		return NULL;
 
-	*part_num = &part_num_store[0];
-	*len = strlen(part_num_store) + 1;
+	return part_num_store;
 }