snow daisy: compute RW firmware hash

Activate the VBOOT code to compute the SHA256 hash of the RW partition
of the EC firmware.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BUG=None
TEST=On Snow, reset the EC and see the hash is computed at startup.

Change-Id: Id1930f823ef516e459b4905c7d0f301568fddf0f
Reviewed-on: https://gerrit.chromium.org/gerrit/29279
Reviewed-by: Vic Yang <victoryang@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>

board/daisy/board.h

@@ -22,6 +22,10 @@
 #define CONFIG_PANIC_NEW_STACK
 #define CONFIG_ASSERT_HELP
 
+/* compute RW firmware hash at startup */
+#define CONFIG_VBOOT
+#define CONFIG_VBOOT_HASH
+
 /* Allow dangerous commands all the time, since we don't have a write protect
  * switch. */
 /* TODO: (crosbug.com/p/9986) This is a serious security hole and should be

board/daisy/ec.tasklist

@@ -15,6 +15,7 @@
  */
 #define CONFIG_TASK_LIST \
 	TASK(WATCHDOG, watchdog_task, NULL) \
+	TASK(VBOOTHASH, vboot_hash_task, NULL) \
 	TASK(POWERLED, power_led_task, NULL) \
 	TASK(PMU_TPS65090_CHARGER, pmu_charger_task, NULL) \
 	TASK(KEYSCAN, keyboard_scan_task, NULL) \

board/snow/board.h

@@ -26,6 +26,10 @@
 #undef  CONFIG_TASK_PROFILING
 #define CONFIG_WATCHDOG_HELP
 
+/* compute RW firmware hash at startup */
+#define CONFIG_VBOOT
+#define CONFIG_VBOOT_HASH
+
 #ifndef __ASSEMBLER__
 
 /* By default, enable all console messages except keyboard */

board/snow/ec.tasklist

@@ -15,6 +15,7 @@
  */
 #define CONFIG_TASK_LIST \
 	TASK(WATCHDOG, watchdog_task, NULL) \
+	TASK(VBOOTHASH, vboot_hash_task, NULL) \
 	TASK(POWERLED, power_led_task, NULL) \
 	TASK(PMU_TPS65090_CHARGER, pmu_charger_task, NULL) \
 	TASK(KEYSCAN, keyboard_scan_task, NULL) \