Description

Generic application interface available on all versions of the bootloader, regardless of the available components.

Note: These Bootloader APIs are not reentrant and should be wrapped in critical section where needed.

Modules
Reset Information
Passing information when resetting into and out of the bootloader.

Data Structures
struct	BareBootTable_t
	Bare boot table. Can be mapped on top of vector table to access contents.

struct	BootloaderInformation_t
	Information about the current bootloader.

struct	BootloaderHeader_t
	Common header for bootloader tables.

struct	FirstBootloaderTable_t
	Address table for the First Stage Bootloader.

struct	MainBootloaderTable_t
	Address table for the Main Bootloader.

Macros
#define	BOOTLOADER_VERSION_MAJOR_SHIFT (24U)
	Bootloader version major version shift value.

#define	BOOTLOADER_VERSION_MINOR_SHIFT (16U)
	Bootloader version minor version shift value.

#define	BOOTLOADER_VERSION_MAJOR_MASK (0xFF000000U)
	Bootloader version major version mask.

#define	BOOTLOADER_VERSION_MINOR_MASK (0x00FF0000U)
	Bootloader version minor version mask.

#define	BOOTLOADER_CAPABILITY_ENFORCE_UPGRADE_SIGNATURE (1 << 0)
	Bootloader enforces signed application upgrade images.

#define	BOOTLOADER_CAPABILITY_ENFORCE_UPGRADE_ENCRYPTION (1 << 1)
	Bootloader enforces encrypted application upgrade images.

#define	BOOTLOADER_CAPABILITY_ENFORCE_SECURE_BOOT (1 << 2)
	Bootloader enforces signature verification of the application image before every boot.

#define	BOOTLOADER_CAPABILITY_BOOTLOADER_UPGRADE (1 << 4)
	Bootloader has the capability of being upgraded.

#define	BOOTLOADER_CAPABILITY_GBL (1 << 5)
	Bootloader has the capability of parsing GBL files.

#define	BOOTLOADER_CAPABILITY_GBL_SIGNATURE (1 << 6)
	Bootloader has the capability of parsing signed GBL files.

#define	BOOTLOADER_CAPABILITY_GBL_ENCRYPTION (1 << 7)
	Bootloader has the capability of parsing encrypted GBL files.

#define	BOOTLOADER_CAPABILITY_ENFORCE_CERTIFICATE_SECURE_BOOT (1 << 8)
	Bootloader enforces signature verification of the application image before every boot using certificate.

#define	BOOTLOADER_CAPABILITY_ROLLBACK_PROTECTION (1 << 9)
	Bootloader has the capability of application rollback protection.

#define	BOOTLOADER_CAPABILITY_PERIPHERAL_LIST (1 << 10)
	Bootloader has the capability to check the peripherals in use.

#define	BOOTLOADER_CAPABILITY_STORAGE (1 << 16)
	Bootloader has the capability of storing data in an internal or external storage medium.

#define	BOOTLOADER_CAPABILITY_COMMUNICATION (1 << 20)
	Bootloader has the capability of communicating with host processors using a communication interface.

#define	BOOTLOADER_MAGIC_FIRST_STAGE (0xB00710ADUL)
	Magic word indicating first stage bootloader table.

#define	BOOTLOADER_MAGIC_MAIN (0x5ECDB007UL)
	Magic word indicating main bootloader table.

#define	firstBootloaderTable
	Pointer to first stage bootloader table.

#define	mainBootloaderTable
	Pointer to main bootloader table.

Enumerations
enum	BootloaderType_t { NO_BOOTLOADER = 0, SL_BOOTLOADER = 1 }
	Bootloader interface APIs are trust zone aware.

Functions
void	bootloader_getInfo (BootloaderInformation_t *info)

int32_t	bootloader_init (void)

int32_t	bootloader_deinit (void)

void	bootloader_rebootAndInstall (void)

bool	bootloader_verifyApplication (uint32_t startAddress)

bool	bootloader_secureBootEnforced (void)

bool	bootloader_getUpgradeLocation (uint32_t *location)

uint32_t	bootloader_remainingApplicationUpgrades (void)

BootloaderResetCause_t	bootloader_getResetReason (void)

__STATIC_INLINE bool	bootloader_pointerToFirstStageValid (const void *ptr)

__STATIC_INLINE bool	bootloader_pointerValid (const void *ptr)

Macro Definition Documentation

#define firstBootloaderTable

Value:

(*(FirstBootloaderTable_t **) \

(BTL_FIRST_BOOTLOADER_TABLE_BASE))

FirstBootloaderTable_t

Address table for the First Stage Bootloader.

Definition: btl_interface.h:125

Pointer to first stage bootloader table.

Definition at line 417 of file btl_interface.h.

#define mainBootloaderTable

Value:

(*(MainBootloaderTable_t **) \

(BTL_MAIN_BOOTLOADER_TABLE_BASE))

MainBootloaderTable_t

Address table for the Main Bootloader.

Definition: btl_interface.h:135

Pointer to main bootloader table.

Definition at line 421 of file btl_interface.h.

Enumeration Type Documentation

enum BootloaderType_t

Bootloader interface APIs are trust zone aware.

Type of bootloader

Enumerator
NO_BOOTLOADER	No bootloader present.
SL_BOOTLOADER	Bootloader is a Silicon Labs bootloader.

Definition at line 97 of file btl_interface.h.

Function Documentation

void bootloader_getInfo ( BootloaderInformation_t * info )

Get information about the bootloader on this device.

The returned information is fetched from the main bootloader information table.

Parameters

[out] info Pointer to the bootloader information struct.

int32_t bootloader_init ( void )

Initialize components of the bootloader so the app can use the interface. This typically includes initializing serial peripherals for communication with external SPI flashes, and so on.

Returns: Error code. BOOTLOADER_OK on success, else error code in BOOTLOADER_ERROR_INIT_BASE range.

int32_t bootloader_deinit ( void )

De-initialize components of the bootloader that were previously initialized. This typically includes powering down external SPI flashes and de-initializing the serial peripheral used for communication with the external flash.

Returns: Error code. BOOTLOADER_OK on success, else error code in BOOTLOADER_ERROR_INIT_BASE range.

void bootloader_rebootAndInstall ( void )

Reboot into the bootloader to perform an install.

If there is a storage component and a slot is marked for bootload, install the image in that slot after verifying it.

If a communication component is present, open the communication channel and receive an image to be installed.

bool bootloader_verifyApplication ( uint32_t startAddress )

Verify the application image stored in the Flash memory starting at the address startAddress.

If the secure boot is enforced, the function will only return true if the cryptographic signature of the application is valid. Otherwise, the application is verified according to the signature type defined in the ApplicationProperties_t structure embedded in the application. Silicon Labs wireless stacks include a declaration of this structure. However, applications not using a full wireless stack may need to instantiate the structure.

Examples of results when the secure boot is not enforced:

App has no signature: Valid if initial stack pointer and program counter have reasonable values.
App has CRC checksum: Valid if checksum is valid.
App has ECDSA signature: Valid if ECDSA signature is valid.

When secure boot is enforced, only ECDSA signed applications with a valid signature are considered valid.

Parameters

[in] startAddress Starting address of the application.

Returns: True if the application is valid, else false.

bool bootloader_secureBootEnforced ( void )

Check whether signature verification on the application image in internal flash is enforced before every boot.

Returns: True if signature verification is enforced, else false.

bool bootloader_getUpgradeLocation ( uint32_t * location )

Get base address of the bootloader upgrade image.

Parameters

[out] location the base address of bootloader upgrade image.

Returns: Returns true if the location was found.

uint32_t bootloader_remainingApplicationUpgrades ( void )

Count the total remaining number of application upgrades.

Returns: remaining number of application upgrades.

BootloaderResetCause_t bootloader_getResetReason ( void )

Get reset cause of the bootloader.

Returns: Reset cause of the bootloader.

__STATIC_INLINE bool bootloader_pointerToFirstStageValid ( const void * ptr )

Check if a pointer is valid and if it points to the bootloader first stage.

This function checks pointers to bootloader jump tables.

Parameters

[in] ptr The pointer to check

Returns: True if the pointer points to the bootloader first stage, false if not.

Definition at line 612 of file btl_interface.h.

__STATIC_INLINE bool bootloader_pointerValid ( const void * ptr )

Check if a pointer is valid and if it points to the bootloader main stage.

This function checks pointers to bootloader jump tables.

Parameters

[in] ptr The pointer to check

Returns: True if the pointer points into the bootloader main stage, false if not.

Definition at line 649 of file btl_interface.h.

Common Application InterfaceApplication Interface

Description

Modules

Data Structures

Macros

Enumerations

Functions

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation