boot: flash-erase-zero (#3344)

Allow compatibility with devices whose flash erase set bytes to 0x00
instead of 0xFF, using a new flash-erase-zero feature.
See issue #3342.

1 files changed, 4 insertions, 0 deletions

diff --git a/embassy-boot/src/lib.rs b/embassy-boot/src/lib.rs
index b4f03e01e..8849055e8 100644
--- a/embassy-boot/src/lib.rs
+++ b/embassy-boot/src/lib.rs
@@ -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,