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boot: flash-erase-zero (#3344)

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Allow compatibility with devices whose flash erase set bytes to 0x00
instead of 0xFF, using a new flash-erase-zero feature.
See issue #3342.
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kingofpayne 2024-09-16 22:07:56 +02:00 committed by GitHub
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commit 6d89f2729a
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2
docs/pages/bootloader.adoc
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@ -19,6 +19,8 @@ The bootloader supports
In general, the bootloader works on any platform that implements the `embedded-storage` traits for its internal flash, but may require custom initialization code to work.
STM32L0x1 devices require the `flash-erase-zero` feature to be enabled.
== Design
image::bootloader_flash.png[Bootloader flash layout]

1
embassy-boot/Cargo.toml
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@ -47,6 +47,7 @@ ed25519-dalek = { version = "2", default-features = false, features = ["std", "r
[features]
ed25519-dalek = ["dep:ed25519-dalek", "_verify"]
ed25519-salty = ["dep:salty", "_verify"]
flash-erase-zero = []
#Internal features
_verify = []

4
embassy-boot/src/lib.rs
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@ -14,7 +14,11 @@ mod test_flash;
// The expected value of the flash after an erase
// TODO: Use the value provided by NorFlash when available
#[cfg(not(feature = "flash-erase-zero"))]
pub(crate) const STATE_ERASE_VALUE: u8 = 0xFF;
#[cfg(feature = "flash-erase-zero")]
pub(crate) const STATE_ERASE_VALUE: u8 = 0x00;
pub use boot_loader::{BootError, BootLoader, BootLoaderConfig};
pub use firmware_updater::{
BlockingFirmwareState, BlockingFirmwareUpdater, FirmwareState, FirmwareUpdater, FirmwareUpdaterConfig,