vboot: add and rejuggle Kconfig options

The ChromeOS machines employing vboot verfication require
different combinations of support:

1. When vboot verification starts.
2. Is the vboot code a separate stage or program?
3. If a separate stage, does the that vboot program (verstage) return
   to the stage that loaded the verstage?

For the above, #1 is dependent on when to load/run vboot logic which
is orthogonal to #2. However, #3 is dependent on #2. The logic
to act on the combinations follows in subsequent patches.

Change-Id: I39ef7a7c2858e7de43aa99c38121e85a57f1f2f6
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10024
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/marvell/bg4cd/Kconfig

@@ -32,7 +32,7 @@ config SOC_MARVELL_BG4CD
 	select GENERIC_UDELAY
 	select HAVE_MONOTONIC_TIMER
 	select GENERIC_GPIO_LIB
-	select VERSTAGE_IN_BOOTBLOCK
+	select VBOOT_STARTS_IN_BOOTBLOCK
 
 if SOC_MARVELL_BG4CD
 

src/vendorcode/google/chromeos/vboot2/Kconfig

@@ -16,6 +16,20 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 ##
 
+config VBOOT_STARTS_IN_BOOTBLOCK
+	bool
+	default n
+	depends on VBOOT_VERIFY_FIRMWARE
+	help
+	  Firmware verification happens during or at the end of bootblock.
+
+config VBOOT_STARTS_IN_ROMSTAGE
+	bool
+	default n
+	depends on VBOOT_VERIFY_FIRMWARE && !VBOOT_STARTS_IN_BOOTBLOCK
+	help
+	  Firmware verification happens during or at the end of romstage.
+
 config VBOOT2_MOCK_SECDATA
 	bool "Mock secdata for firmware verification"
 	default n
@@ -27,16 +41,6 @@ config VBOOT2_MOCK_SECDATA
 	  can be used during development when a TPM is not present or broken.
 	  THIS SHOULD NOT BE LEFT ON FOR PRODUCTION DEVICES.
 
-config RETURN_FROM_VERSTAGE
-	bool "return from verstage"
-	default n
-	depends on VBOOT_VERIFY_FIRMWARE
-	help
-	  If this is set, the verstage returns back to the bootblock instead of
-	  exits to the romstage so that the verstage space can be reused by the
-	  romstage. Useful if a ram space is too small to fit both the verstage
-	  and the romstage.
-
 config VBOOT_DISABLE_DEV_ON_RECOVERY
 	bool "Disable dev mode on recovery requests"
 	default n
@@ -46,15 +50,20 @@ config VBOOT_DISABLE_DEV_ON_RECOVERY
 	  developer mode as soon as recovery request is detected. This is
 	  handy on embedded devices with limited input capabilities.
 
-config VERSTAGE_IN_BOOTBLOCK
+config SEPARATE_VERSTAGE
 	bool
 	default n
 	depends on VBOOT_VERIFY_FIRMWARE
 
-config SEPARATE_VERSTAGE
+config RETURN_FROM_VERSTAGE
 	bool
-	default !VERSTAGE_IN_BOOTBLOCK
+	default n
-	depends on VBOOT_VERIFY_FIRMWARE
+	depends on SEPARATE_VERSTAGE
+	help
+	  If this is set, the verstage returns back to the calling stage instead
+	  of exiting to the succeeding stage so that the verstage space can be
+	  reused by the succeeding stage. This is useful if a ram space is too
+	  small to fit both the verstage and the succeeding stage.
 
 # These VBOOT_X_INDEX are the position of X in FW_MAIN_A/B region. The index
 # table is created by cros_bundle_firmware at build time based on the positions

src/vendorcode/google/chromeos/vboot2/Makefile.inc

@@ -63,5 +63,9 @@ fallback/verstage-file = $(objcbfs)/verstage.elf
 fallback/verstage-type = stage
 fallback/verstage-compression = none
 else
+ifeq ($(VBOOT_STARTS_IN_BOOTBLOCK),y)
 bootblock-srcs += $(objgenerated)/libverstage.a
+else
+romstage-srcs += $(objgenerated)/libverstage.a
 endif
+endif # CONFIG_SEPARATE_VERSTAGE