security/vboot: Deprecate VBOOT_VBNV_EC

Boards using VBOOT_VBNV_EC (nyan, daisy, veyron, peach_pit) are all
ChromeOS devices and they've reached the end of life since Feb 2022.
Therefore, remove VBOOT_VBNV_EC for them, each with different
replacement.

- nyan (nyan, nyan_big, nyan_blaze): Add RW_NVRAM to their FMAP (by
  reducing the size of RW_VPD), and replace VBOOT_VBNV_EC with
  VBOOT_VBNV_FLASH.
- veyron: Add RW_NVRAM to their FMAP (by reducing the size of
  SHARED_DATA), and replace VBOOT_VBNV_EC with VBOOT_VBNV_FLASH. Also
  enlarge the OVERLAP_VERSTAGE_ROMSTAGE section for rk3288 (by reducing
  the size of PRERAM_CBMEM_CONSOLE), so that verstage won't exceed its
  allotted size.
- daisy: Because BOOT_DEVICE_SPI_FLASH is not set, which is required for
  VBOOT_VBNV_FLASH, disable MAINBOARD_HAS_CHROMEOS and VBOOT configs.
- peach_pit: As VBOOT is not set, simply remove the unused VBOOT_VBNV_EC
  option.

Remove the VBOOT_VBNV_EC Kconfig option as well as related code, leaving
VBOOT_VBNV_FLASH and VBOOT_VBNV_CMOS as the only two backend options for
vboot nvdata (VBNV).

Also add a check in read_vbnv() and save_vbnv() for VBNV options.

BUG=b:178689388
TEST=util/abuild/abuild -t GOOGLE_NYAN -x -a
TEST=util/abuild/abuild -t GOOGLE_VEYRON_JAQ -x -a
TEST=util/abuild/abuild -t GOOGLE_DAISY -a
TEST=util/abuild/abuild -t GOOGLE_PEACH_PIT -a
BRANCH=none

Change-Id: Ic67d69e694cff3176dbee12d4c6311bc85295863
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65012
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

4 files changed, 5 insertions, 32 deletions

diff --git a/src/security/vboot/Kconfig b/src/security/vboot/Kconfig
index 04770c94eb..06f9e93485 100644
--- a/src/security/vboot/Kconfig
+++ b/src/security/vboot/Kconfig
@@ -58,12 +58,6 @@ config VBOOT_VBNV_CMOS_BACKUP_TO_FLASH
 	  Vboot non-volatile storage data will be backed up from CMOS to flash
 	  and restored from flash if the CMOS is invalid due to power loss.
 
-config VBOOT_VBNV_EC
-	bool
-	default n
-	help
-	  VBNV is stored in EC
-
 config VBOOT_VBNV_FLASH
 	bool
 	default n
diff --git a/src/security/vboot/Makefile.inc b/src/security/vboot/Makefile.inc
index 52f374ec82..2caeb17434 100644
--- a/src/security/vboot/Makefile.inc
+++ b/src/security/vboot/Makefile.inc
@@ -72,11 +72,6 @@ verstage-$(CONFIG_VBOOT_VBNV_CMOS_BACKUP_TO_FLASH) += vbnv_flash.c
 romstage-$(CONFIG_VBOOT_VBNV_CMOS_BACKUP_TO_FLASH) += vbnv_flash.c
 ramstage-$(CONFIG_VBOOT_VBNV_CMOS_BACKUP_TO_FLASH) += vbnv_flash.c
 
-bootblock-$(CONFIG_VBOOT_VBNV_EC) += vbnv_ec.c
-verstage-$(CONFIG_VBOOT_VBNV_EC) += vbnv_ec.c
-romstage-$(CONFIG_VBOOT_VBNV_EC) += vbnv_ec.c
-ramstage-$(CONFIG_VBOOT_VBNV_EC) += vbnv_ec.c
-
 bootblock-$(CONFIG_VBOOT_VBNV_FLASH) += vbnv_flash.c
 verstage-$(CONFIG_VBOOT_VBNV_FLASH) += vbnv_flash.c
 romstage-$(CONFIG_VBOOT_VBNV_FLASH) += vbnv_flash.c
diff --git a/src/security/vboot/vbnv.c b/src/security/vboot/vbnv.c
index 7e92401e55..26946fd335 100644
--- a/src/security/vboot/vbnv.c
+++ b/src/security/vboot/vbnv.c
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <assert.h>
 #include <string.h>
 #include <types.h>
 #include <security/vboot/vbnv.h>
@@ -61,10 +62,10 @@ void read_vbnv(uint8_t *vbnv_copy)
 {
 	if (CONFIG(VBOOT_VBNV_CMOS))
 		read_vbnv_cmos(vbnv_copy);
-	else if (CONFIG(VBOOT_VBNV_EC))
-		read_vbnv_ec(vbnv_copy);
 	else if (CONFIG(VBOOT_VBNV_FLASH))
 		read_vbnv_flash(vbnv_copy);
+	else
+		dead_code();
 
 	/* Check data for consistency */
 	if (!verify_vbnv(vbnv_copy))
@@ -79,10 +80,10 @@ void save_vbnv(const uint8_t *vbnv_copy)
 {
 	if (CONFIG(VBOOT_VBNV_CMOS))
 		save_vbnv_cmos(vbnv_copy);
-	else if (CONFIG(VBOOT_VBNV_EC))
-		save_vbnv_ec(vbnv_copy);
 	else if (CONFIG(VBOOT_VBNV_FLASH))
 		save_vbnv_flash(vbnv_copy);
+	else
+		dead_code();
 
 	/* Clear initialized flag to force cached data to be updated */
 	vbnv_initialized = 0;
diff --git a/src/security/vboot/vbnv_ec.c b/src/security/vboot/vbnv_ec.c
deleted file mode 100644
index fcae37a910..0000000000
--- a/src/security/vboot/vbnv_ec.c
+++ /dev/null
@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-
-#include <types.h>
-#include <ec/google/chromeec/ec.h>
-#include <security/vboot/vbnv.h>
-#include <security/vboot/vbnv_layout.h>
-
-void read_vbnv_ec(uint8_t *vbnv_copy)
-{
-	google_chromeec_vbnv_context(1, vbnv_copy, VBOOT_VBNV_BLOCK_SIZE);
-}
-
-void save_vbnv_ec(const uint8_t *vbnv_copy)
-{
-	google_chromeec_vbnv_context(0, (uint8_t *)vbnv_copy,
-				     VBOOT_VBNV_BLOCK_SIZE);
-}