# SPDX-License-Identifier: GPL-2.0-only menu "Verified Boot (vboot)" config VBOOT_LIB bool help Build and link the vboot library. Makes the vboot API accessible across all coreboot stages, without enabling vboot verification. For verification, please see the VBOOT option below. config VBOOT bool "Verify firmware with vboot." default n select VBOOT_LIB select VBOOT_MOCK_SECDATA if !TPM depends on 0 = 0 # Must have a 'depends on' or board overrides will break it. help Enabling VBOOT will use vboot to verify the components of the firmware (stages, payload, etc). if VBOOT comment "Anti-Rollback Protection disabled because mocking secdata is enabled." depends on VBOOT_MOCK_SECDATA config VBOOT_SLOTS_RW_A bool "Firmware RO + RW_A" help Have one update partition beside the RO partition. config VBOOT_SLOTS_RW_AB bool "Firmware RO + RW_A + RW_B" select VBOOT_SLOTS_RW_A help Have two update partitions beside the RO partition. config VBOOT_VBNV_CMOS bool default n depends on PC80_SYSTEM help VBNV is stored in CMOS config VBOOT_VBNV_OFFSET hex default 0x26 depends on VBOOT_VBNV_CMOS help CMOS offset for VbNv data. This value must match cmos.layout in the mainboard directory, minus 14 bytes for the RTC. config VBOOT_VBNV_CMOS_BACKUP_TO_FLASH bool default n depends on VBOOT_VBNV_CMOS && BOOT_DEVICE_SUPPORTS_WRITES help 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 depends on BOOT_DEVICE_SUPPORTS_WRITES help VBNV is stored in flash storage config VBOOT_STARTS_BEFORE_BOOTBLOCK def_bool n select VBOOT_SEPARATE_VERSTAGE help Firmware verification happens before the main processor is brought online. config VBOOT_STARTS_IN_BOOTBLOCK bool default n help Firmware verification happens during the end of or right after the bootblock. This implies that a static VBOOT2_WORK() buffer must be allocated in memlayout. config VBOOT_STARTS_IN_ROMSTAGE bool default n depends on !VBOOT_STARTS_IN_BOOTBLOCK help Firmware verification happens during the end of romstage (after memory initialization). This implies that the vboot work buffer is in CBMEM from the start and doesn't need to be reserved in memlayout. config VBOOT_MOCK_SECDATA bool "Mock secdata for firmware verification" default n help Enabling VBOOT_MOCK_SECDATA will mock secdata for the firmware verification to avoid access to a secdata storage (typically TPM). All operations for a secdata storage will be successful. This option can be used during development when a TPM is not present or broken. THIS SHOULD NOT BE LEFT ON FOR PRODUCTION DEVICES. config VBOOT_DISABLE_DEV_ON_RECOVERY bool default n help When this option is enabled, the Chrome OS device leaves the developer mode as soon as recovery request is detected. This is handy on embedded devices with limited input capabilities. config VBOOT_SEPARATE_VERSTAGE bool default n depends on VBOOT_STARTS_IN_BOOTBLOCK || VBOOT_STARTS_BEFORE_BOOTBLOCK help If this option is set, vboot verification runs in a standalone stage that is loaded from the bootblock and exits into romstage. If it is not set, the verification code is linked directly into the bootblock or the romstage and runs as part of that stage (cf. related options VBOOT_STARTS_IN_BOOTBLOCK/_ROMSTAGE and VBOOT_RETURN_FROM_VERSTAGE). config VBOOT_RETURN_FROM_VERSTAGE bool default n depends on VBOOT_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. config VBOOT_MUST_REQUEST_DISPLAY bool default y if VGA_ROM_RUN default n help Set this option to indicate to vboot that this platform will skip its display initialization on a normal (non-recovery, non-developer) boot. Unless display is specifically requested, the video option ROM is not loaded, and any other native display initialization code is not run. config VBOOT_ALWAYS_ENABLE_DISPLAY bool "Force to always enable display" default n help Set this option to indicate to vboot that display should always be enabled. config VBOOT_ALWAYS_ALLOW_UDC bool "Always allow UDC" default n depends on !CHROMEOS help This option allows UDC to be enabled regardless of the vboot state. config VBOOT_HAS_REC_HASH_SPACE bool default y if MRC_SAVE_HASH_IN_TPM && HAS_RECOVERY_MRC_CACHE default n help Set this option to indicate to vboot that recovery data hash space is present in TPM. config VBOOT_LID_SWITCH bool default n help Whether this platform has a lid switch. If it does, vboot will not decrement try counters for boot failures if the lid is closed. config VBOOT_WIPEOUT_SUPPORTED bool default n help When this option is enabled, the firmware provides the ability to signal the application the need for factory reset (a.k.a. wipe out) of the device config VBOOT_FWID_MODEL string "Firmware ID model" default "Google_\$(CONFIG_MAINBOARD_PART_NUMBER)" if CHROMEOS default "\$(CONFIG_MAINBOARD_VENDOR)_\$(CONFIG_MAINBOARD_PART_NUMBER)" help This is the first part of the FWID written to various regions of a vboot firmware image to identify its version. config VBOOT_FWID_VERSION string "Firmware ID version" default ".\$(KERNELVERSION)" help This is the second part of the FWID written to various regions of a vboot firmware image to identify its version. config VBOOT_NO_BOARD_SUPPORT bool "Allow the use of vboot without board support" default n help Enable weak functions for get_write_protect_state and get_recovery_mode_switch in order to proceed with refactoring of the vboot2 code base. Later on this code is removed and replaced by interfaces. config RO_REGION_ONLY string "Additional files that should not be copied to RW" default "" help Add a space delimited list of filenames that should only be in the RO section. config RW_REGION_ONLY string default "" depends on VBOOT_SLOTS_RW_A help Add a space delimited list of filenames that should only be in the RW sections. config RWA_REGION_ONLY string default "" depends on VBOOT_SLOTS_RW_AB help Add a space-delimited list of filenames that should only be in the RW-A section. config RWB_REGION_ONLY string default "" depends on VBOOT_SLOTS_RW_AB help Add a space-delimited list of filenames that should only be in the RW-B section. config CBFS_MCACHE_RW_PERCENTAGE int "Percentage of CBFS metadata cache used for RW CBFS" depends on !NO_CBFS_MCACHE default 50 help The amount of the CBFS_MCACHE area that's used for the RW CBFS, in percent from 0 to 100. The remaining area will be used for the RO CBFS. Default is an even 50/50 split. When VBOOT is disabled, this will automatically be 0 (meaning the whole MCACHE is used for RO). Do NOT change this value for vboot RW updates! config VBOOT_ENABLE_CBFS_FALLBACK bool default n depends on VBOOT_SLOTS_RW_A help When this option is enabled cbfs_boot_locate will look for a file in the RO (COREBOOT) region if it isn't available in the active RW region. config VBOOT_EARLY_EC_SYNC bool default n depends on EC_GOOGLE_CHROMEEC help Enables CrOS EC software sync in romstage, before memory training runs. This is useful mainly as a way to achieve full USB-PD negotiation earlier in the boot flow, as the EC will only do this once it has made the sysjump to its RW firmware. It should not significantly impact boot time, as this operation will be performed later in the boot flow if it is disabled here. config VBOOT_EC_EFS bool "Early firmware selection (EFS) EC" default n help CrosEC can support EFS: Early Firmware Selection. If it's enabled, software sync needs to also support it. This setting tells vboot to perform EFS software sync. menu "GBB configuration" config GBB_HWID string "Hardware ID" default "" help A hardware identifier for device. On Chrome OS this is used for auto update and recovery, and will be generated when manufacturing by the factory software, in a strictly defined format. Leave empty to get a test-only Chrome OS HWID v2 string generated. config GBB_BMPFV_FILE string "Path to bmpfv image" default "" config GBB_FLAG_DEV_SCREEN_SHORT_DELAY bool "Reduce dev screen delay" default n config GBB_FLAG_LOAD_OPTION_ROMS bool "Load option ROMs" default n config GBB_FLAG_ENABLE_ALTERNATE_OS bool "Allow booting a non-Chrome OS kernel if dev switch is on" default n config GBB_FLAG_FORCE_DEV_SWITCH_ON bool "Force dev switch on" default n config GBB_FLAG_FORCE_DEV_BOOT_USB bool "Allow booting from USB in dev mode even if dev_boot_usb=0" default y config GBB_FLAG_DISABLE_FW_ROLLBACK_CHECK bool "Disable firmware rollback protection" default y config GBB_FLAG_ENTER_TRIGGERS_TONORM bool "Return to normal boot with Enter" default n config GBB_FLAG_FORCE_DEV_BOOT_ALTFW bool "Allow booting altfw in dev mode even if dev_boot_altfw=0" default n config GBB_FLAG_RUNNING_FAFT bool "Running FAFT tests; used as a hint to disable other debug features" default n config GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC bool "Disable EC software sync" default n config GBB_FLAG_DEFAULT_DEV_BOOT_ALTFW bool "Default to booting altfw in dev mode" default n config GBB_FLAG_DISABLE_PD_SOFTWARE_SYNC bool "Disable PD software sync" default n config GBB_FLAG_DISABLE_LID_SHUTDOWN bool "Disable shutdown on closed lid" default n config GBB_FLAG_FORCE_MANUAL_RECOVERY bool "Always assume manual recovery in recovery mode" default n config GBB_FLAG_DISABLE_FWMP bool "Disable Firmware Management Parameters (FWMP)" default n config GBB_FLAG_ENABLE_UDC bool "Enable USB Device Controller" default n endmenu # GBB menu "Vboot Keys" config VBOOT_ROOT_KEY string "Root key (public)" default "\$(VBOOT_SOURCE)/tests/devkeys/root_key.vbpubk" config VBOOT_RECOVERY_KEY string "Recovery key (public)" default "\$(VBOOT_SOURCE)/tests/devkeys/recovery_key.vbpubk" config VBOOT_FIRMWARE_PRIVKEY string "Firmware key (private)" default "\$(VBOOT_SOURCE)/tests/devkeys/firmware_data_key.vbprivk" config VBOOT_KERNEL_KEY string "Kernel subkey (public)" default "\$(VBOOT_SOURCE)/tests/devkeys/kernel_subkey.vbpubk" config VBOOT_KEYBLOCK string "Keyblock to use for the RW regions" default "\$(VBOOT_SOURCE)/tests/devkeys/firmware.keyblock" config VBOOT_KEYBLOCK_VERSION int "Keyblock version number" default 1 config VBOOT_KEYBLOCK_PREAMBLE_FLAGS hex "Keyblock preamble flags" default 0x0 config VBOOT_HASH_BLOCK_SIZE hex default 0x400 help Set the default hash size. Generally 1k is reasonable, but in some cases it may improve hashing speed to increase the size. Note that this buffer is allocated in the stack. Although the build should fail if the stack size is exceeded, it's something to be aware of when changing the size. endmenu # Keys endif # VBOOT endmenu # Verified Boot (vboot)