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merge embassy/master

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This commit is contained in:
sander
2023-04-11 13:48:34 +02:00
parent 6b2aaacf83 b150b9506b
commit c309797488
160 changed files with 6748 additions and 3549 deletions
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4
embassy-boot/boot/Cargo.toml
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@ -24,6 +24,7 @@ features = ["defmt"]
[dependencies]
defmt = { version = "0.3", optional = true }
digest = "0.10"
log = { version = "0.4", optional = true }
ed25519-dalek = { version = "1.0.1", default_features = false, features = ["u32_backend"], optional = true }
embassy-sync = { version = "0.1.0", path = "../../embassy-sync" }
@ -37,6 +38,7 @@ log = "0.4"
env_logger = "0.9"
rand = "0.7" # ed25519-dalek v1.0.1 depends on this exact version
futures = { version = "0.3", features = ["executor"] }
sha1 = "0.10.5"
[dev-dependencies.ed25519-dalek]
default_features = false
@ -50,4 +52,4 @@ ed25519-salty = ["dep:salty", "_verify"]
nightly = ["dep:embedded-storage-async"]
#Internal features
_verify = []
_verify = []

533
embassy-boot/boot/src/boot_loader.rs Normal file
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@ -0,0 +1,533 @@
use embedded_storage::nor_flash::{ErrorType, NorFlash, NorFlashError, NorFlashErrorKind, ReadNorFlash};
use crate::{Partition, State, BOOT_MAGIC, SWAP_MAGIC};
/// Errors returned by bootloader
#[derive(PartialEq, Eq, Debug)]
pub enum BootError {
/// Error from flash.
Flash(NorFlashErrorKind),
/// Invalid bootloader magic
BadMagic,
}
#[cfg(feature = "defmt")]
impl defmt::Format for BootError {
fn format(&self, fmt: defmt::Formatter) {
match self {
BootError::Flash(_) => defmt::write!(fmt, "BootError::Flash(_)"),
BootError::BadMagic => defmt::write!(fmt, "BootError::BadMagic"),
}
}
}
impl<E> From<E> for BootError
where
E: NorFlashError,
{
fn from(error: E) -> Self {
BootError::Flash(error.kind())
}
}
/// Trait defining the flash handles used for active and DFU partition.
pub trait FlashConfig {
/// The erase value of the state flash. Typically the default of 0xFF is used, but some flashes use a different value.
const STATE_ERASE_VALUE: u8 = 0xFF;
/// Flash type used for the state partition.
type STATE: NorFlash;
/// Flash type used for the active partition.
type ACTIVE: NorFlash;
/// Flash type used for the dfu partition.
type DFU: NorFlash;
/// Return flash instance used to write/read to/from active partition.
fn active(&mut self) -> &mut Self::ACTIVE;
/// Return flash instance used to write/read to/from dfu partition.
fn dfu(&mut self) -> &mut Self::DFU;
/// Return flash instance used to write/read to/from bootloader state.
fn state(&mut self) -> &mut Self::STATE;
}
trait FlashConfigEx {
fn page_size() -> u32;
}
impl<T: FlashConfig> FlashConfigEx for T {
/// Get the page size which is the "unit of operation" within the bootloader.
fn page_size() -> u32 {
core::cmp::max(T::ACTIVE::ERASE_SIZE, T::DFU::ERASE_SIZE) as u32
}
}
/// BootLoader works with any flash implementing embedded_storage.
pub struct BootLoader {
// Page with current state of bootloader. The state partition has the following format:
// All ranges are in multiples of WRITE_SIZE bytes.
// | Range | Description |
// | 0..1 | Magic indicating bootloader state. BOOT_MAGIC means boot, SWAP_MAGIC means swap. |
// | 1..2 | Progress validity. ERASE_VALUE means valid, !ERASE_VALUE means invalid. |
// | 2..2 + N | Progress index used while swapping or reverting |
state: Partition,
// Location of the partition which will be booted from
active: Partition,
// Location of the partition which will be swapped in when requested
dfu: Partition,
}
impl BootLoader {
/// Create a new instance of a bootloader with the given partitions.
///
/// - All partitions must be aligned with the PAGE_SIZE const generic parameter.
/// - The dfu partition must be at least PAGE_SIZE bigger than the active partition.
pub fn new(active: Partition, dfu: Partition, state: Partition) -> Self {
Self { active, dfu, state }
}
/// Return the offset of the active partition into the active flash.
pub fn boot_address(&self) -> usize {
self.active.from as usize
}
/// Perform necessary boot preparations like swapping images.
///
/// The DFU partition is assumed to be 1 page bigger than the active partition for the swap
/// algorithm to work correctly.
///
/// The provided aligned_buf argument must satisfy any alignment requirements
/// given by the partition flashes. All flash operations will use this buffer.
///
/// SWAPPING
///
/// Assume a flash size of 3 pages for the active partition, and 4 pages for the DFU partition.
/// The swap index contains the copy progress, as to allow continuation of the copy process on
/// power failure. The index counter is represented within 1 or more pages (depending on total
/// flash size), where a page X is considered swapped if index at location (X + WRITE_SIZE)
/// contains a zero value. This ensures that index updates can be performed atomically and
/// avoid a situation where the wrong index value is set (page write size is "atomic").
///
/// +-----------+------------+--------+--------+--------+--------+
/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
/// +-----------+------------+--------+--------+--------+--------+
/// | Active | 0 | 1 | 2 | 3 | - |
/// | DFU | 0 | 3 | 2 | 1 | X |
/// +-----------+------------+--------+--------+--------+--------+
///
/// The algorithm starts by copying 'backwards', and after the first step, the layout is
/// as follows:
///
/// +-----------+------------+--------+--------+--------+--------+
/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
/// +-----------+------------+--------+--------+--------+--------+
/// | Active | 1 | 1 | 2 | 1 | - |
/// | DFU | 1 | 3 | 2 | 1 | 3 |
/// +-----------+------------+--------+--------+--------+--------+
///
/// The next iteration performs the same steps
///
/// +-----------+------------+--------+--------+--------+--------+
/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
/// +-----------+------------+--------+--------+--------+--------+
/// | Active | 2 | 1 | 2 | 1 | - |
/// | DFU | 2 | 3 | 2 | 2 | 3 |
/// +-----------+------------+--------+--------+--------+--------+
///
/// And again until we're done
///
/// +-----------+------------+--------+--------+--------+--------+
/// | Partition | Swap Index | Page 0 | Page 1 | Page 3 | Page 4 |
/// +-----------+------------+--------+--------+--------+--------+
/// | Active | 3 | 3 | 2 | 1 | - |
/// | DFU | 3 | 3 | 1 | 2 | 3 |
/// +-----------+------------+--------+--------+--------+--------+
///
/// REVERTING
///
/// The reverting algorithm uses the swap index to discover that images were swapped, but that
/// the application failed to mark the boot successful. In this case, the revert algorithm will
/// run.
///
/// The revert index is located separately from the swap index, to ensure that revert can continue
/// on power failure.
///
/// The revert algorithm works forwards, by starting copying into the 'unused' DFU page at the start.
///
/// +-----------+--------------+--------+--------+--------+--------+
/// | Partition | Revert Index | Page 0 | Page 1 | Page 3 | Page 4 |
//*/
/// +-----------+--------------+--------+--------+--------+--------+
/// | Active | 3 | 1 | 2 | 1 | - |
/// | DFU | 3 | 3 | 1 | 2 | 3 |
/// +-----------+--------------+--------+--------+--------+--------+
///
///
/// +-----------+--------------+--------+--------+--------+--------+
/// | Partition | Revert Index | Page 0 | Page 1 | Page 3 | Page 4 |
/// +-----------+--------------+--------+--------+--------+--------+
/// | Active | 3 | 1 | 2 | 1 | - |
/// | DFU | 3 | 3 | 2 | 2 | 3 |
/// +-----------+--------------+--------+--------+--------+--------+
///
/// +-----------+--------------+--------+--------+--------+--------+
/// | Partition | Revert Index | Page 0 | Page 1 | Page 3 | Page 4 |
/// +-----------+--------------+--------+--------+--------+--------+
/// | Active | 3 | 1 | 2 | 3 | - |
/// | DFU | 3 | 3 | 2 | 1 | 3 |
/// +-----------+--------------+--------+--------+--------+--------+
///
pub fn prepare_boot<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<State, BootError> {
// Ensure we have enough progress pages to store copy progress
assert_eq!(0, P::page_size() % aligned_buf.len() as u32);
assert_eq!(0, P::page_size() % P::ACTIVE::WRITE_SIZE as u32);
assert_eq!(0, P::page_size() % P::ACTIVE::ERASE_SIZE as u32);
assert_eq!(0, P::page_size() % P::DFU::WRITE_SIZE as u32);
assert_eq!(0, P::page_size() % P::DFU::ERASE_SIZE as u32);
assert!(aligned_buf.len() >= P::STATE::WRITE_SIZE);
assert_eq!(0, aligned_buf.len() % P::ACTIVE::WRITE_SIZE);
assert_eq!(0, aligned_buf.len() % P::DFU::WRITE_SIZE);
assert_partitions(self.active, self.dfu, self.state, P::page_size(), P::STATE::WRITE_SIZE);
// Copy contents from partition N to active
let state = self.read_state(p, aligned_buf)?;
if state == State::Swap {
//
// Check if we already swapped. If we're in the swap state, this means we should revert
// since the app has failed to mark boot as successful
//
if !self.is_swapped(p, aligned_buf)? {
trace!("Swapping");
self.swap(p, aligned_buf)?;
trace!("Swapping done");
} else {
trace!("Reverting");
self.revert(p, aligned_buf)?;
let state_flash = p.state();
let state_word = &mut aligned_buf[..P::STATE::WRITE_SIZE];
// Invalidate progress
state_word.fill(!P::STATE_ERASE_VALUE);
self.state
.write_blocking(state_flash, P::STATE::WRITE_SIZE as u32, state_word)?;
// Clear magic and progress
self.state.wipe_blocking(state_flash)?;
// Set magic
state_word.fill(BOOT_MAGIC);
self.state.write_blocking(state_flash, 0, state_word)?;
}
}
Ok(state)
}
fn is_swapped<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<bool, BootError> {
let page_count = (self.active.size() / P::page_size()) as usize;
let progress = self.current_progress(p, aligned_buf)?;
Ok(progress >= page_count * 2)
}
fn current_progress<P: FlashConfig>(&mut self, config: &mut P, aligned_buf: &mut [u8]) -> Result<usize, BootError> {
let write_size = P::STATE::WRITE_SIZE as u32;
let max_index = (((self.state.size() - write_size) / write_size) - 2) as usize;
let state_flash = config.state();
let state_word = &mut aligned_buf[..write_size as usize];
self.state.read_blocking(state_flash, write_size, state_word)?;
if state_word.iter().any(|&b| b != P::STATE_ERASE_VALUE) {
// Progress is invalid
return Ok(max_index);
}
for index in 0..max_index {
self.state
.read_blocking(state_flash, (2 + index) as u32 * write_size, state_word)?;
if state_word.iter().any(|&b| b == P::STATE_ERASE_VALUE) {
return Ok(index);
}
}
Ok(max_index)
}
fn update_progress<P: FlashConfig>(
&mut self,
progress_index: usize,
p: &mut P,
aligned_buf: &mut [u8],
) -> Result<(), BootError> {
let state_word = &mut aligned_buf[..P::STATE::WRITE_SIZE];
state_word.fill(!P::STATE_ERASE_VALUE);
self.state.write_blocking(
p.state(),
(2 + progress_index) as u32 * P::STATE::WRITE_SIZE as u32,
state_word,
)?;
Ok(())
}
fn copy_page_once_to_active<P: FlashConfig>(
&mut self,
progress_index: usize,
from_offset: u32,
to_offset: u32,
p: &mut P,
aligned_buf: &mut [u8],
) -> Result<(), BootError> {
if self.current_progress(p, aligned_buf)? <= progress_index {
let page_size = P::page_size() as u32;
self.active
.erase_blocking(p.active(), to_offset, to_offset + page_size)?;
for offset_in_page in (0..page_size).step_by(aligned_buf.len()) {
self.dfu
.read_blocking(p.dfu(), from_offset + offset_in_page as u32, aligned_buf)?;
self.active
.write_blocking(p.active(), to_offset + offset_in_page as u32, aligned_buf)?;
}
self.update_progress(progress_index, p, aligned_buf)?;
}
Ok(())
}
fn copy_page_once_to_dfu<P: FlashConfig>(
&mut self,
progress_index: usize,
from_offset: u32,
to_offset: u32,
p: &mut P,
aligned_buf: &mut [u8],
) -> Result<(), BootError> {
if self.current_progress(p, aligned_buf)? <= progress_index {
let page_size = P::page_size() as u32;
self.dfu
.erase_blocking(p.dfu(), to_offset as u32, to_offset + page_size)?;
for offset_in_page in (0..page_size).step_by(aligned_buf.len()) {
self.active
.read_blocking(p.active(), from_offset + offset_in_page as u32, aligned_buf)?;
self.dfu
.write_blocking(p.dfu(), to_offset + offset_in_page as u32, aligned_buf)?;
}
self.update_progress(progress_index, p, aligned_buf)?;
}
Ok(())
}
fn swap<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<(), BootError> {
let page_size = P::page_size();
let page_count = self.active.size() / page_size;
for page_num in 0..page_count {
let progress_index = (page_num * 2) as usize;
// Copy active page to the 'next' DFU page.
let active_from_offset = (page_count - 1 - page_num) * page_size;
let dfu_to_offset = (page_count - page_num) * page_size;
//trace!("Copy active {} to dfu {}", active_from_offset, dfu_to_offset);
self.copy_page_once_to_dfu(progress_index, active_from_offset, dfu_to_offset, p, aligned_buf)?;
// Copy DFU page to the active page
let active_to_offset = (page_count - 1 - page_num) * page_size;
let dfu_from_offset = (page_count - 1 - page_num) * page_size;
//trace!("Copy dfy {} to active {}", dfu_from_offset, active_to_offset);
self.copy_page_once_to_active(progress_index + 1, dfu_from_offset, active_to_offset, p, aligned_buf)?;
}
Ok(())
}
fn revert<P: FlashConfig>(&mut self, p: &mut P, aligned_buf: &mut [u8]) -> Result<(), BootError> {
let page_size = P::page_size();
let page_count = self.active.size() / page_size;
for page_num in 0..page_count {
let progress_index = (page_count * 2 + page_num * 2) as usize;
// Copy the bad active page to the DFU page
let active_from_offset = page_num * page_size;
let dfu_to_offset = page_num * page_size;
self.copy_page_once_to_dfu(progress_index, active_from_offset, dfu_to_offset, p, aligned_buf)?;
// Copy the DFU page back to the active page
let active_to_offset = page_num * page_size;
let dfu_from_offset = (page_num + 1) * page_size;
self.copy_page_once_to_active(progress_index + 1, dfu_from_offset, active_to_offset, p, aligned_buf)?;
}
Ok(())
}
fn read_state<P: FlashConfig>(&mut self, config: &mut P, aligned_buf: &mut [u8]) -> Result<State, BootError> {
let state_word = &mut aligned_buf[..P::STATE::WRITE_SIZE];
self.state.read_blocking(config.state(), 0, state_word)?;
if !state_word.iter().any(|&b| b != SWAP_MAGIC) {
Ok(State::Swap)
} else {
Ok(State::Boot)
}
}
}
fn assert_partitions(active: Partition, dfu: Partition, state: Partition, page_size: u32, state_write_size: usize) {
assert_eq!(active.size() % page_size, 0);
assert_eq!(dfu.size() % page_size, 0);
assert!(dfu.size() - active.size() >= page_size);
assert!(2 + 2 * (active.size() / page_size) <= state.size() / state_write_size as u32);
}
/// A flash wrapper implementing the Flash and embedded_storage traits.
pub struct BootFlash<F>
where
F: NorFlash,
{
flash: F,
}
impl<F> BootFlash<F>
where
F: NorFlash,
{
/// Create a new instance of a bootable flash
pub fn new(flash: F) -> Self {
Self { flash }
}
}
impl<F> ErrorType for BootFlash<F>
where
F: NorFlash,
{
type Error = F::Error;
}
impl<F> NorFlash for BootFlash<F>
where
F: NorFlash,
{
const WRITE_SIZE: usize = F::WRITE_SIZE;
const ERASE_SIZE: usize = F::ERASE_SIZE;
fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
F::erase(&mut self.flash, from, to)
}
fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
F::write(&mut self.flash, offset, bytes)
}
}
impl<F> ReadNorFlash for BootFlash<F>
where
F: NorFlash,
{
const READ_SIZE: usize = F::READ_SIZE;
fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
F::read(&mut self.flash, offset, bytes)
}
fn capacity(&self) -> usize {
F::capacity(&self.flash)
}
}
/// Convenience provider that uses a single flash for all partitions.
pub struct SingleFlashConfig<'a, F>
where
F: NorFlash,
{
flash: &'a mut F,
}
impl<'a, F> SingleFlashConfig<'a, F>
where
F: NorFlash,
{
/// Create a provider for a single flash.
pub fn new(flash: &'a mut F) -> Self {
Self { flash }
}
}
impl<'a, F> FlashConfig for SingleFlashConfig<'a, F>
where
F: NorFlash,
{
type STATE = F;
type ACTIVE = F;
type DFU = F;
fn active(&mut self) -> &mut Self::STATE {
self.flash
}
fn dfu(&mut self) -> &mut Self::ACTIVE {
self.flash
}
fn state(&mut self) -> &mut Self::DFU {
self.flash
}
}
/// Convenience flash provider that uses separate flash instances for each partition.
pub struct MultiFlashConfig<'a, ACTIVE, STATE, DFU>
where
ACTIVE: NorFlash,
STATE: NorFlash,
DFU: NorFlash,
{
active: &'a mut ACTIVE,
state: &'a mut STATE,
dfu: &'a mut DFU,
}
impl<'a, ACTIVE, STATE, DFU> MultiFlashConfig<'a, ACTIVE, STATE, DFU>
where
ACTIVE: NorFlash,
STATE: NorFlash,
DFU: NorFlash,
{
/// Create a new flash provider with separate configuration for all three partitions.
pub fn new(active: &'a mut ACTIVE, state: &'a mut STATE, dfu: &'a mut DFU) -> Self {
Self { active, state, dfu }
}
}
impl<'a, ACTIVE, STATE, DFU> FlashConfig for MultiFlashConfig<'a, ACTIVE, STATE, DFU>
where
ACTIVE: NorFlash,
STATE: NorFlash,
DFU: NorFlash,
{
type STATE = STATE;
type ACTIVE = ACTIVE;
type DFU = DFU;
fn active(&mut self) -> &mut Self::ACTIVE {
self.active
}
fn dfu(&mut self) -> &mut Self::DFU {
self.dfu
}
fn state(&mut self) -> &mut Self::STATE {
self.state
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[should_panic]
fn test_range_asserts() {
const ACTIVE: Partition = Partition::new(4096, 4194304);
const DFU: Partition = Partition::new(4194304, 2 * 4194304);
const STATE: Partition = Partition::new(0, 4096);
assert_partitions(ACTIVE, DFU, STATE, 4096, 4);
}
}

30
embassy-boot/boot/src/digest_adapters/ed25519_dalek.rs Normal file
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@ -0,0 +1,30 @@
use digest::typenum::U64;
use digest::{FixedOutput, HashMarker, OutputSizeUser, Update};
use ed25519_dalek::Digest as _;
pub struct Sha512(ed25519_dalek::Sha512);
impl Default for Sha512 {
fn default() -> Self {
Self(ed25519_dalek::Sha512::new())
}
}
impl Update for Sha512 {
fn update(&mut self, data: &[u8]) {
self.0.update(data)
}
}
impl FixedOutput for Sha512 {
fn finalize_into(self, out: &mut digest::Output<Self>) {
let result = self.0.finalize();
out.as_mut_slice().copy_from_slice(result.as_slice())
}
}
impl OutputSizeUser for Sha512 {
type OutputSize = U64;
}
impl HashMarker for Sha512 {}

5
embassy-boot/boot/src/digest_adapters/mod.rs Normal file
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@ -0,0 +1,5 @@
#[cfg(feature = "ed25519-dalek")]
pub(crate) mod ed25519_dalek;
#[cfg(feature = "ed25519-salty")]
pub(crate) mod salty;

29
embassy-boot/boot/src/digest_adapters/salty.rs Normal file
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@ -0,0 +1,29 @@
use digest::typenum::U64;
use digest::{FixedOutput, HashMarker, OutputSizeUser, Update};
pub struct Sha512(salty::Sha512);
impl Default for Sha512 {
fn default() -> Self {
Self(salty::Sha512::new())
}
}
impl Update for Sha512 {
fn update(&mut self, data: &[u8]) {
self.0.update(data)
}
}
impl FixedOutput for Sha512 {
fn finalize_into(self, out: &mut digest::Output<Self>) {
let result = self.0.finalize();
out.as_mut_slice().copy_from_slice(result.as_slice())
}
}
impl OutputSizeUser for Sha512 {
type OutputSize = U64;
}
impl HashMarker for Sha512 {}

534
embassy-boot/boot/src/firmware_updater.rs Normal file
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@ -0,0 +1,534 @@
use digest::Digest;
use embedded_storage::nor_flash::{NorFlash, NorFlashError, NorFlashErrorKind};
use embedded_storage_async::nor_flash::NorFlash as AsyncNorFlash;
use crate::{Partition, State, BOOT_MAGIC, SWAP_MAGIC};
/// Errors returned by FirmwareUpdater
#[derive(Debug)]
pub enum FirmwareUpdaterError {
/// Error from flash.
Flash(NorFlashErrorKind),
/// Signature errors.
Signature(signature::Error),
}
#[cfg(feature = "defmt")]
impl defmt::Format for FirmwareUpdaterError {
fn format(&self, fmt: defmt::Formatter) {
match self {
FirmwareUpdaterError::Flash(_) => defmt::write!(fmt, "FirmwareUpdaterError::Flash(_)"),
FirmwareUpdaterError::Signature(_) => defmt::write!(fmt, "FirmwareUpdaterError::Signature(_)"),
}
}
}
impl<E> From<E> for FirmwareUpdaterError
where
E: NorFlashError,
{
fn from(error: E) -> Self {
FirmwareUpdaterError::Flash(error.kind())
}
}
/// FirmwareUpdater is an application API for interacting with the BootLoader without the ability to
/// 'mess up' the internal bootloader state
pub struct FirmwareUpdater {
state: Partition,
dfu: Partition,
}
impl Default for FirmwareUpdater {
fn default() -> Self {
extern "C" {
static __bootloader_state_start: u32;
static __bootloader_state_end: u32;
static __bootloader_dfu_start: u32;
static __bootloader_dfu_end: u32;
}
let dfu = unsafe {
Partition::new(
&__bootloader_dfu_start as *const u32 as u32,
&__bootloader_dfu_end as *const u32 as u32,
)
};
let state = unsafe {
Partition::new(
&__bootloader_state_start as *const u32 as u32,
&__bootloader_state_end as *const u32 as u32,
)
};
trace!("DFU: 0x{:x} - 0x{:x}", dfu.from, dfu.to);
trace!("STATE: 0x{:x} - 0x{:x}", state.from, state.to);
FirmwareUpdater::new(dfu, state)
}
}
impl FirmwareUpdater {
/// Create a firmware updater instance with partition ranges for the update and state partitions.
pub const fn new(dfu: Partition, state: Partition) -> Self {
Self { dfu, state }
}
/// Obtain the current state.
///
/// This is useful to check if the bootloader has just done a swap, in order
/// to do verifications and self-tests of the new image before calling
/// `mark_booted`.
pub async fn get_state<F: AsyncNorFlash>(
&mut self,
state_flash: &mut F,
aligned: &mut [u8],
) -> Result<State, FirmwareUpdaterError> {
self.state.read(state_flash, 0, aligned).await?;
if !aligned.iter().any(|&b| b != SWAP_MAGIC) {
Ok(State::Swap)
} else {
Ok(State::Boot)
}
}
/// Verify the DFU given a public key. If there is an error then DO NOT
/// proceed with updating the firmware as it must be signed with a
/// corresponding private key (otherwise it could be malicious firmware).
///
/// Mark to trigger firmware swap on next boot if verify suceeds.
///
/// If the "ed25519-salty" feature is set (or another similar feature) then the signature is expected to have
/// been generated from a SHA-512 digest of the firmware bytes.
///
/// If no signature feature is set then this method will always return a
/// signature error.
///
/// # Safety
///
/// The `_aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being read from
/// and written to.
#[cfg(feature = "_verify")]
pub async fn verify_and_mark_updated<F: AsyncNorFlash>(
&mut self,
_state_and_dfu_flash: &mut F,
_public_key: &[u8],
_signature: &[u8],
_update_len: u32,
_aligned: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
assert_eq!(_aligned.len(), F::WRITE_SIZE);
assert!(_update_len <= self.dfu.size());
#[cfg(feature = "ed25519-dalek")]
{
use ed25519_dalek::{PublicKey, Signature, SignatureError, Verifier};
use crate::digest_adapters::ed25519_dalek::Sha512;
let into_signature_error = |e: SignatureError| FirmwareUpdaterError::Signature(e.into());
let public_key = PublicKey::from_bytes(_public_key).map_err(into_signature_error)?;
let signature = Signature::from_bytes(_signature).map_err(into_signature_error)?;
let mut message = [0; 64];
self.hash::<_, Sha512>(_state_and_dfu_flash, _update_len, _aligned, &mut message)
.await?;
public_key.verify(&message, &signature).map_err(into_signature_error)?
}
#[cfg(feature = "ed25519-salty")]
{
use salty::constants::{PUBLICKEY_SERIALIZED_LENGTH, SIGNATURE_SERIALIZED_LENGTH};
use salty::{PublicKey, Signature};
use crate::digest_adapters::salty::Sha512;
fn into_signature_error<E>(_: E) -> FirmwareUpdaterError {
FirmwareUpdaterError::Signature(signature::Error::default())
}
let public_key: [u8; PUBLICKEY_SERIALIZED_LENGTH] = _public_key.try_into().map_err(into_signature_error)?;
let public_key = PublicKey::try_from(&public_key).map_err(into_signature_error)?;
let signature: [u8; SIGNATURE_SERIALIZED_LENGTH] = _signature.try_into().map_err(into_signature_error)?;
let signature = Signature::try_from(&signature).map_err(into_signature_error)?;
let mut message = [0; 64];
self.hash::<_, Sha512>(_state_and_dfu_flash, _update_len, _aligned, &mut message)
.await?;
let r = public_key.verify(&message, &signature);
trace!(
"Verifying with public key {}, signature {} and message {} yields ok: {}",
public_key.to_bytes(),
signature.to_bytes(),
message,
r.is_ok()
);
r.map_err(into_signature_error)?
}
self.set_magic(_aligned, SWAP_MAGIC, _state_and_dfu_flash).await
}
/// Verify the update in DFU with any digest.
pub async fn hash<F: AsyncNorFlash, D: Digest>(
&mut self,
dfu_flash: &mut F,
update_len: u32,
chunk_buf: &mut [u8],
output: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
let mut digest = D::new();
for offset in (0..update_len).step_by(chunk_buf.len()) {
self.dfu.read(dfu_flash, offset, chunk_buf).await?;
let len = core::cmp::min((update_len - offset) as usize, chunk_buf.len());
digest.update(&chunk_buf[..len]);
}
output.copy_from_slice(digest.finalize().as_slice());
Ok(())
}
/// Mark to trigger firmware swap on next boot.
///
/// # Safety
///
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
#[cfg(not(feature = "_verify"))]
pub async fn mark_updated<F: AsyncNorFlash>(
&mut self,
state_flash: &mut F,
aligned: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
assert_eq!(aligned.len(), F::WRITE_SIZE);
self.set_magic(aligned, SWAP_MAGIC, state_flash).await
}
/// Mark firmware boot successful and stop rollback on reset.
///
/// # Safety
///
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
pub async fn mark_booted<F: AsyncNorFlash>(
&mut self,
state_flash: &mut F,
aligned: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
assert_eq!(aligned.len(), F::WRITE_SIZE);
self.set_magic(aligned, BOOT_MAGIC, state_flash).await
}
async fn set_magic<F: AsyncNorFlash>(
&mut self,
aligned: &mut [u8],
magic: u8,
state_flash: &mut F,
) -> Result<(), FirmwareUpdaterError> {
self.state.read(state_flash, 0, aligned).await?;
if aligned.iter().any(|&b| b != magic) {
// Read progress validity
self.state.read(state_flash, F::WRITE_SIZE as u32, aligned).await?;
// FIXME: Do not make this assumption.
const STATE_ERASE_VALUE: u8 = 0xFF;
if aligned.iter().any(|&b| b != STATE_ERASE_VALUE) {
// The current progress validity marker is invalid
} else {
// Invalidate progress
aligned.fill(!STATE_ERASE_VALUE);
self.state.write(state_flash, F::WRITE_SIZE as u32, aligned).await?;
}
// Clear magic and progress
self.state.wipe(state_flash).await?;
// Set magic
aligned.fill(magic);
self.state.write(state_flash, 0, aligned).await?;
}
Ok(())
}
/// Write data to a flash page.
///
/// The buffer must follow alignment requirements of the target flash and a multiple of page size big.
///
/// # Safety
///
/// Failing to meet alignment and size requirements may result in a panic.
pub async fn write_firmware<F: AsyncNorFlash>(
&mut self,
offset: usize,
data: &[u8],
dfu_flash: &mut F,
) -> Result<(), FirmwareUpdaterError> {
assert!(data.len() >= F::ERASE_SIZE);
self.dfu
.erase(dfu_flash, offset as u32, (offset + data.len()) as u32)
.await?;
self.dfu.write(dfu_flash, offset as u32, data).await?;
Ok(())
}
/// Prepare for an incoming DFU update by erasing the entire DFU area and
/// returning its `Partition`.
///
/// Using this instead of `write_firmware` allows for an optimized API in
/// exchange for added complexity.
pub async fn prepare_update<F: AsyncNorFlash>(
&mut self,
dfu_flash: &mut F,
) -> Result<Partition, FirmwareUpdaterError> {
self.dfu.wipe(dfu_flash).await?;
Ok(self.dfu)
}
//
// Blocking API
//
/// Obtain the current state.
///
/// This is useful to check if the bootloader has just done a swap, in order
/// to do verifications and self-tests of the new image before calling
/// `mark_booted`.
pub fn get_state_blocking<F: NorFlash>(
&mut self,
state_flash: &mut F,
aligned: &mut [u8],
) -> Result<State, FirmwareUpdaterError> {
self.state.read_blocking(state_flash, 0, aligned)?;
if !aligned.iter().any(|&b| b != SWAP_MAGIC) {
Ok(State::Swap)
} else {
Ok(State::Boot)
}
}
/// Verify the DFU given a public key. If there is an error then DO NOT
/// proceed with updating the firmware as it must be signed with a
/// corresponding private key (otherwise it could be malicious firmware).
///
/// Mark to trigger firmware swap on next boot if verify suceeds.
///
/// If the "ed25519-salty" feature is set (or another similar feature) then the signature is expected to have
/// been generated from a SHA-512 digest of the firmware bytes.
///
/// If no signature feature is set then this method will always return a
/// signature error.
///
/// # Safety
///
/// The `_aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being read from
/// and written to.
#[cfg(feature = "_verify")]
pub fn verify_and_mark_updated_blocking<F: NorFlash>(
&mut self,
_state_and_dfu_flash: &mut F,
_public_key: &[u8],
_signature: &[u8],
_update_len: u32,
_aligned: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
assert_eq!(_aligned.len(), F::WRITE_SIZE);
assert!(_update_len <= self.dfu.size());
#[cfg(feature = "ed25519-dalek")]
{
use ed25519_dalek::{PublicKey, Signature, SignatureError, Verifier};
use crate::digest_adapters::ed25519_dalek::Sha512;
let into_signature_error = |e: SignatureError| FirmwareUpdaterError::Signature(e.into());
let public_key = PublicKey::from_bytes(_public_key).map_err(into_signature_error)?;
let signature = Signature::from_bytes(_signature).map_err(into_signature_error)?;
let mut message = [0; 64];
self.hash_blocking::<_, Sha512>(_state_and_dfu_flash, _update_len, _aligned, &mut message)?;
public_key.verify(&message, &signature).map_err(into_signature_error)?
}
#[cfg(feature = "ed25519-salty")]
{
use salty::constants::{PUBLICKEY_SERIALIZED_LENGTH, SIGNATURE_SERIALIZED_LENGTH};
use salty::{PublicKey, Signature};
use crate::digest_adapters::salty::Sha512;
fn into_signature_error<E>(_: E) -> FirmwareUpdaterError {
FirmwareUpdaterError::Signature(signature::Error::default())
}
let public_key: [u8; PUBLICKEY_SERIALIZED_LENGTH] = _public_key.try_into().map_err(into_signature_error)?;
let public_key = PublicKey::try_from(&public_key).map_err(into_signature_error)?;
let signature: [u8; SIGNATURE_SERIALIZED_LENGTH] = _signature.try_into().map_err(into_signature_error)?;
let signature = Signature::try_from(&signature).map_err(into_signature_error)?;
let mut message = [0; 64];
self.hash_blocking::<_, Sha512>(_state_and_dfu_flash, _update_len, _aligned, &mut message)?;
let r = public_key.verify(&message, &signature);
trace!(
"Verifying with public key {}, signature {} and message {} yields ok: {}",
public_key.to_bytes(),
signature.to_bytes(),
message,
r.is_ok()
);
r.map_err(into_signature_error)?
}
self.set_magic_blocking(_aligned, SWAP_MAGIC, _state_and_dfu_flash)
}
/// Verify the update in DFU with any digest.
pub fn hash_blocking<F: NorFlash, D: Digest>(
&mut self,
dfu_flash: &mut F,
update_len: u32,
chunk_buf: &mut [u8],
output: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
let mut digest = D::new();
for offset in (0..update_len).step_by(chunk_buf.len()) {
self.dfu.read_blocking(dfu_flash, offset, chunk_buf)?;
let len = core::cmp::min((update_len - offset) as usize, chunk_buf.len());
digest.update(&chunk_buf[..len]);
}
output.copy_from_slice(digest.finalize().as_slice());
Ok(())
}
/// Mark to trigger firmware swap on next boot.
///
/// # Safety
///
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
#[cfg(not(feature = "_verify"))]
pub fn mark_updated_blocking<F: NorFlash>(
&mut self,
state_flash: &mut F,
aligned: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
assert_eq!(aligned.len(), F::WRITE_SIZE);
self.set_magic_blocking(aligned, SWAP_MAGIC, state_flash)
}
/// Mark firmware boot successful and stop rollback on reset.
///
/// # Safety
///
/// The `aligned` buffer must have a size of F::WRITE_SIZE, and follow the alignment rules for the flash being written to.
pub fn mark_booted_blocking<F: NorFlash>(
&mut self,
state_flash: &mut F,
aligned: &mut [u8],
) -> Result<(), FirmwareUpdaterError> {
assert_eq!(aligned.len(), F::WRITE_SIZE);
self.set_magic_blocking(aligned, BOOT_MAGIC, state_flash)
}
fn set_magic_blocking<F: NorFlash>(
&mut self,
aligned: &mut [u8],
magic: u8,
state_flash: &mut F,
) -> Result<(), FirmwareUpdaterError> {
self.state.read_blocking(state_flash, 0, aligned)?;
if aligned.iter().any(|&b| b != magic) {
// Read progress validity
self.state.read_blocking(state_flash, F::WRITE_SIZE as u32, aligned)?;
// FIXME: Do not make this assumption.
const STATE_ERASE_VALUE: u8 = 0xFF;
if aligned.iter().any(|&b| b != STATE_ERASE_VALUE) {
// The current progress validity marker is invalid
} else {
// Invalidate progress
aligned.fill(!STATE_ERASE_VALUE);
self.state.write_blocking(state_flash, F::WRITE_SIZE as u32, aligned)?;
}
// Clear magic and progress
self.state.wipe_blocking(state_flash)?;
// Set magic
aligned.fill(magic);
self.state.write_blocking(state_flash, 0, aligned)?;
}
Ok(())
}
/// Write data to a flash page.
///
/// The buffer must follow alignment requirements of the target flash and a multiple of page size big.
///
/// # Safety
///
/// Failing to meet alignment and size requirements may result in a panic.
pub fn write_firmware_blocking<F: NorFlash>(
&mut self,
offset: usize,
data: &[u8],
dfu_flash: &mut F,
) -> Result<(), FirmwareUpdaterError> {
assert!(data.len() >= F::ERASE_SIZE);
self.dfu
.erase_blocking(dfu_flash, offset as u32, (offset + data.len()) as u32)?;
self.dfu.write_blocking(dfu_flash, offset as u32, data)?;
Ok(())
}
/// Prepare for an incoming DFU update by erasing the entire DFU area and
/// returning its `Partition`.
///
/// Using this instead of `write_firmware_blocking` allows for an optimized
/// API in exchange for added complexity.
pub fn prepare_update_blocking<F: NorFlash>(&mut self, flash: &mut F) -> Result<Partition, FirmwareUpdaterError> {
self.dfu.wipe_blocking(flash)?;
Ok(self.dfu)
}
}
#[cfg(test)]
mod tests {
use futures::executor::block_on;
use sha1::{Digest, Sha1};
use super::*;
use crate::mem_flash::MemFlash;
#[test]
fn can_verify_sha1() {
const STATE: Partition = Partition::new(0, 4096);
const DFU: Partition = Partition::new(65536, 131072);
let mut flash = MemFlash::<131072, 4096, 8>::default();
let update = [0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66];
let mut to_write = [0; 4096];
to_write[..7].copy_from_slice(update.as_slice());
let mut updater = FirmwareUpdater::new(DFU, STATE);
block_on(updater.write_firmware(0, to_write.as_slice(), &mut flash)).unwrap();
let mut chunk_buf = [0; 2];
let mut hash = [0; 20];
block_on(updater.hash::<_, Sha1>(&mut flash, update.len() as u32, &mut chunk_buf, &mut hash)).unwrap();
assert_eq!(Sha1::digest(update).as_slice(), hash);
}
}

1427
embassy-boot/boot/src/lib.rs
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164
embassy-boot/boot/src/mem_flash.rs Normal file
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#![allow(unused)]
use core::ops::{Bound, Range, RangeBounds};
use embedded_storage::nor_flash::{ErrorType, NorFlash, NorFlashError, NorFlashErrorKind, ReadNorFlash};
use embedded_storage_async::nor_flash::{NorFlash as AsyncNorFlash, ReadNorFlash as AsyncReadNorFlash};
pub struct MemFlash<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> {
pub mem: [u8; SIZE],
pub pending_write_successes: Option<usize>,
}
#[derive(Debug)]
pub struct MemFlashError;
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE> {
pub const fn new(fill: u8) -> Self {
Self {
mem: [fill; SIZE],
pending_write_successes: None,
}
}
#[cfg(test)]
pub fn random() -> Self {
let mut mem = [0; SIZE];
for byte in mem.iter_mut() {
*byte = rand::random::<u8>();
}
Self {
mem,
pending_write_successes: None,
}
}
pub fn program(&mut self, offset: u32, bytes: &[u8]) -> Result<(), MemFlashError> {
let offset = offset as usize;
assert!(bytes.len() % WRITE_SIZE == 0);
assert!(offset % WRITE_SIZE == 0);
assert!(offset + bytes.len() <= SIZE);
self.mem[offset..offset + bytes.len()].copy_from_slice(bytes);
Ok(())
}
pub fn assert_eq(&self, offset: u32, expectation: &[u8]) {
for i in 0..expectation.len() {
assert_eq!(self.mem[offset as usize + i], expectation[i], "Index {}", i);
}
}
}
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> Default
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
{
fn default() -> Self {
Self::new(0xFF)
}
}
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> ErrorType
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
{
type Error = MemFlashError;
}
impl NorFlashError for MemFlashError {
fn kind(&self) -> NorFlashErrorKind {
NorFlashErrorKind::Other
}
}
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> ReadNorFlash
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
{
const READ_SIZE: usize = 1;
fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
let len = bytes.len();
bytes.copy_from_slice(&self.mem[offset as usize..offset as usize + len]);
Ok(())
}
fn capacity(&self) -> usize {
SIZE
}
}
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> NorFlash
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
{
const WRITE_SIZE: usize = WRITE_SIZE;
const ERASE_SIZE: usize = ERASE_SIZE;
fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
let from = from as usize;
let to = to as usize;
assert!(from % ERASE_SIZE == 0);
assert!(to % ERASE_SIZE == 0, "To: {}, erase size: {}", to, ERASE_SIZE);
for i in from..to {
self.mem[i] = 0xFF;
}
Ok(())
}
fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
let offset = offset as usize;
assert!(bytes.len() % WRITE_SIZE == 0);
assert!(offset % WRITE_SIZE == 0);
assert!(offset + bytes.len() <= SIZE);
if let Some(pending_successes) = self.pending_write_successes {
if pending_successes > 0 {
self.pending_write_successes = Some(pending_successes - 1);
} else {
return Err(MemFlashError);
}
}
for ((offset, mem_byte), new_byte) in self
.mem
.iter_mut()
.enumerate()
.skip(offset)
.take(bytes.len())
.zip(bytes)
{
assert_eq!(0xFF, *mem_byte, "Offset {} is not erased", offset);
*mem_byte = *new_byte;
}
Ok(())
}
}
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> AsyncReadNorFlash
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
{
const READ_SIZE: usize = 1;
async fn read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Self::Error> {
<Self as ReadNorFlash>::read(self, offset, bytes)
}
fn capacity(&self) -> usize {
<Self as ReadNorFlash>::capacity(self)
}
}
impl<const SIZE: usize, const ERASE_SIZE: usize, const WRITE_SIZE: usize> AsyncNorFlash
for MemFlash<SIZE, ERASE_SIZE, WRITE_SIZE>
{
const WRITE_SIZE: usize = WRITE_SIZE;
const ERASE_SIZE: usize = ERASE_SIZE;
async fn erase(&mut self, from: u32, to: u32) -> Result<(), Self::Error> {
<Self as NorFlash>::erase(self, from, to)
}
async fn write(&mut self, offset: u32, bytes: &[u8]) -> Result<(), Self::Error> {
<Self as NorFlash>::write(self, offset, bytes)
}
}

139
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use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
use embedded_storage_async::nor_flash::{NorFlash as AsyncNorFlash, ReadNorFlash as AsyncReadNorFlash};
/// A region in flash used by the bootloader.
#[derive(Copy, Clone, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct Partition {
/// The offset into the flash where the partition starts.
pub from: u32,
/// The offset into the flash where the partition ends.
pub to: u32,
}
impl Partition {
/// Create a new partition with the provided range
pub const fn new(from: u32, to: u32) -> Self {
Self { from, to }
}
/// Return the size of the partition
pub const fn size(&self) -> u32 {
self.to - self.from
}
/// Read from the partition on the provided flash
pub async fn read<F: AsyncReadNorFlash>(
&self,
flash: &mut F,
offset: u32,
bytes: &mut [u8],
) -> Result<(), F::Error> {
let offset = self.from as u32 + offset;
flash.read(offset, bytes).await
}
/// Write to the partition on the provided flash
pub async fn write<F: AsyncNorFlash>(&self, flash: &mut F, offset: u32, bytes: &[u8]) -> Result<(), F::Error> {
let offset = self.from as u32 + offset;
flash.write(offset, bytes).await?;
trace!("Wrote from 0x{:x} len {}", offset, bytes.len());
Ok(())
}
/// Erase part of the partition on the provided flash
pub async fn erase<F: AsyncNorFlash>(&self, flash: &mut F, from: u32, to: u32) -> Result<(), F::Error> {
let from = self.from as u32 + from;
let to = self.from as u32 + to;
flash.erase(from, to).await?;
trace!("Erased from 0x{:x} to 0x{:x}", from, to);
Ok(())
}
/// Erase the entire partition
pub(crate) async fn wipe<F: AsyncNorFlash>(&self, flash: &mut F) -> Result<(), F::Error> {
let from = self.from as u32;
let to = self.to as u32;
flash.erase(from, to).await?;
trace!("Wiped from 0x{:x} to 0x{:x}", from, to);
Ok(())
}
/// Read from the partition on the provided flash
pub fn read_blocking<F: ReadNorFlash>(&self, flash: &mut F, offset: u32, bytes: &mut [u8]) -> Result<(), F::Error> {
let offset = self.from as u32 + offset;
flash.read(offset, bytes)
}
/// Write to the partition on the provided flash
pub fn write_blocking<F: NorFlash>(&self, flash: &mut F, offset: u32, bytes: &[u8]) -> Result<(), F::Error> {
let offset = self.from as u32 + offset;
flash.write(offset, bytes)?;
trace!("Wrote from 0x{:x} len {}", offset, bytes.len());
Ok(())
}
/// Erase part of the partition on the provided flash
pub fn erase_blocking<F: NorFlash>(&self, flash: &mut F, from: u32, to: u32) -> Result<(), F::Error> {
let from = self.from as u32 + from;
let to = self.from as u32 + to;
flash.erase(from, to)?;
trace!("Erased from 0x{:x} to 0x{:x}", from, to);
Ok(())
}
/// Erase the entire partition
pub(crate) fn wipe_blocking<F: NorFlash>(&self, flash: &mut F) -> Result<(), F::Error> {
let from = self.from as u32;
let to = self.to as u32;
flash.erase(from, to)?;
trace!("Wiped from 0x{:x} to 0x{:x}", from, to);
Ok(())
}
}
#[cfg(test)]
mod tests {
use crate::mem_flash::MemFlash;
use crate::Partition;
#[test]
fn can_erase() {
let mut flash = MemFlash::<1024, 64, 4>::new(0x00);
let partition = Partition::new(256, 512);
partition.erase_blocking(&mut flash, 64, 192).unwrap();
for (index, byte) in flash.mem.iter().copied().enumerate().take(256 + 64) {
assert_eq!(0x00, byte, "Index {}", index);
}
for (index, byte) in flash.mem.iter().copied().enumerate().skip(256 + 64).take(128) {
assert_eq!(0xFF, byte, "Index {}", index);
}
for (index, byte) in flash.mem.iter().copied().enumerate().skip(256 + 64 + 128) {
assert_eq!(0x00, byte, "Index {}", index);
}
}
#[test]
fn can_wipe() {
let mut flash = MemFlash::<1024, 64, 4>::new(0x00);
let partition = Partition::new(256, 512);
partition.wipe_blocking(&mut flash).unwrap();
for (index, byte) in flash.mem.iter().copied().enumerate().take(256) {
assert_eq!(0x00, byte, "Index {}", index);
}
for (index, byte) in flash.mem.iter().copied().enumerate().skip(256).take(256) {
assert_eq!(0xFF, byte, "Index {}", index);
}
for (index, byte) in flash.mem.iter().copied().enumerate().skip(512) {
assert_eq!(0x00, byte, "Index {}", index);
}
}
}