EFS2: Implement Early Firmware Selection ver.2

EFS v1 allowed Chromeboxes to verify RW without AP. EFS v2 will bring
the benefts to Chromebooks, which are:

- Reduce RO dependency and presence. Allow more code to be updated
  in the fields.
- Remove jumptag and workarounds needed for late sysjump.

Major imporvements over v1 are:

- No A/B slot required.
- No signature in RW or public key in RO.
- Rollback-attack protection.
- Verifies only RW being used instead of whole RW section.

For battery-equipped devices, additional benefts are:

- Immediate boot on drained battery.
- Support recovery mode regardless of battery condition.
- Faster charge in S5/G3.

EC-Cr50 communication is based on the shared UART (go/ec-cr50-comm).
EFS2 is documented in go/ec-efs2.

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>

BUG=chromium:1045217,chromium:141143112
BRANCH=none
TEST=Boot Helios in NORMAL/NO_BOOT/NO_BOOT_RECOVERY/RECOVERY mode.
TEST=Wake up EC from hibernate.
TEST=Make EC assert PACKET_MODE to wake up Cr50 from deepsleep.

Change-Id: I98a4fe1ecc59d106810a75daec3c424f953ff880
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2015357
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Auto-Submit: Daisuke Nojiri <dnojiri@chromium.org>

4 files changed, 6 insertions, 6 deletions

diff --git a/board/endeavour/board.h b/board/endeavour/board.h
index a37b3ab947..989ad69e78 100644
--- a/board/endeavour/board.h
+++ b/board/endeavour/board.h
@@ -148,7 +148,7 @@ enum OEM_ID {
 
 /* Board specific handlers */
 void led_alert(int enable);
-void led_critical(void);
+void show_critical_error(void);
 
 #endif /* !__ASSEMBLER__ */
 
diff --git a/board/endeavour/led.c b/board/endeavour/led.c
index f6d270c25b..5133b65f74 100644
--- a/board/endeavour/led.c
+++ b/board/endeavour/led.c
@@ -174,7 +174,7 @@ void led_alert(int enable)
 	}
 }
 
-void led_critical(void)
+void show_critical_error(void)
 {
 	hook_call_deferred(&led_tick_data, -1);
 	if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
@@ -202,7 +202,7 @@ static int command_led(int argc, char **argv)
 	} else if (!strcasecmp(argv[1], "alert")) {
 		led_alert(1);
 	} else if (!strcasecmp(argv[1], "crit")) {
-		led_critical();
+		show_critical_error();
 	} else {
 		return EC_ERROR_PARAM1;
 	}
diff --git a/board/puff/board.h b/board/puff/board.h
index 7d0fdbaefc..0c69c58eef 100644
--- a/board/puff/board.h
+++ b/board/puff/board.h
@@ -264,7 +264,7 @@ enum temp_sensor_id {
 void board_reset_pd_mcu(void);
 void board_set_tcpc_power_mode(int port, int mode);
 void led_alert(int enable);
-void led_critical(void);
+void show_critical_error(void);
 
 #endif /* !__ASSEMBLER__ */
 
diff --git a/board/puff/led.c b/board/puff/led.c
index 49dfbce935..56f0914872 100644
--- a/board/puff/led.c
+++ b/board/puff/led.c
@@ -179,7 +179,7 @@ void led_alert(int enable)
 	}
 }
 
-void led_critical(void)
+void show_critical_error(void)
 {
 	hook_call_deferred(&led_tick_data, -1);
 	if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
@@ -207,7 +207,7 @@ static int command_led(int argc, char **argv)
 	} else if (!strcasecmp(argv[1], "alert")) {
 		led_alert(1);
 	} else if (!strcasecmp(argv[1], "crit")) {
-		led_critical();
+		show_critical_error();
 	} else {
 		return EC_ERROR_PARAM1;
 	}