purin: add purin under mainboard

this change covers bootblock and romstage.

BUG=none
BRANCH=tot
TEST=ran emerge-purin coreboot

Change-Id: Ifffb2e93189e8e85338de469432f3296e3e71791
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: cd479583404958f72461e9c1639f0288a00f228e
Original-Change-Id: Iaee4a8c457e42386a4100a8121144b8cf5f21e8c
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/242853
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9751
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/purin/boardid.c

@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google Inc.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <boardid.h>
+
+uint8_t board_id(void)
+{
+	return -1;
+}