Struct rp_pac::powman::regs::Bootdis

#[repr(transparent)]
pub struct Bootdis(pub u32);

Tell the bootrom to ignore the BOOT0..3 registers following the next RSM reset (e.g. the next core power down/up). If an early boot stage has soft-locked some OTP pages in order to protect their contents from later stages, there is a risk that Secure code running at a later stage can unlock the pages by powering the core up and down. This register can be used to ensure that the bootloader runs as normal on the next power up, preventing Secure code at a later stage from accessing OTP in its unlocked state. Should be used in conjunction with the OTP BOOTDIS register.

Tuple Fields

0: u32

Implementations

impl Bootdis

pub const fn now(&self) -> bool

When powman resets the RSM, the current value of BOOTDIS_NEXT is OR’d into BOOTDIS_NOW, and BOOTDIS_NEXT is cleared. The bootrom checks this flag before reading the BOOT0..3 registers. If it is set, the bootrom clears it, and ignores the BOOT registers. This prevents Secure software from diverting the boot path before a bootloader has had the chance to soft lock OTP pages containing sensitive data.

pub fn set_now(&mut self, val: bool)

When powman resets the RSM, the current value of BOOTDIS_NEXT is OR’d into BOOTDIS_NOW, and BOOTDIS_NEXT is cleared. The bootrom checks this flag before reading the BOOT0..3 registers. If it is set, the bootrom clears it, and ignores the BOOT registers. This prevents Secure software from diverting the boot path before a bootloader has had the chance to soft lock OTP pages containing sensitive data.

pub const fn next(&self) -> bool

This flag always ORs writes into its current contents. It can be set but not cleared by software. The BOOTDIS_NEXT bit is OR’d into the BOOTDIS_NOW bit when the core is powered down. Simultaneously, the BOOTDIS_NEXT bit is cleared. Setting this bit means that the BOOT0..3 registers will be ignored following the next reset of the RSM by powman. This flag should be set by an early boot stage that has soft-locked OTP pages, to prevent later stages from unlocking it by power cycling.

pub fn set_next(&mut self, val: bool)

This flag always ORs writes into its current contents. It can be set but not cleared by software. The BOOTDIS_NEXT bit is OR’d into the BOOTDIS_NOW bit when the core is powered down. Simultaneously, the BOOTDIS_NEXT bit is cleared. Setting this bit means that the BOOT0..3 registers will be ignored following the next reset of the RSM by powman. This flag should be set by an early boot stage that has soft-locked OTP pages, to prevent later stages from unlocking it by power cycling.

Trait Implementations

impl Clone for Bootdis

fn clone(&self) -> Bootdis

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for Bootdis

fn default() -> Bootdis

Returns the “default value” for a type.

impl PartialEq for Bootdis

fn eq(&self, other: &Bootdis) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Bootdis

impl Eq for Bootdis

impl StructuralPartialEq for Bootdis