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Avoid writing bootloader flash if not needed

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This commit is contained in:
Ulf Lilleengen 2022-03-31 15:23:06 +02:00
parent f028b0064b
commit b0a53610ba
1 changed files with 36 additions and 24 deletions
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60
embassy-boot/boot/src/lib.rs
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@ -318,21 +318,27 @@ impl FirmwareUpdater {
#[repr(align(4))]
struct Aligned([u8; 4]);
flash
.write(self.state.from as u32, &Aligned([0; 4]).0)
.await?;
flash
.erase(self.state.from as u32, self.state.to as u32)
.await?;
trace!(
"Setting swap magic at {} to 0x{:x}, LE: 0x{:x}",
self.state.from,
&SWAP_MAGIC,
&SWAP_MAGIC.to_le_bytes()
);
flash
.write(self.state.from as u32, &SWAP_MAGIC.to_le_bytes())
.await?;
let mut magic = Aligned([0; 4]);
flash.read(self.state.from as u32, &mut magic.0).await?;
let magic = u32::from_le_bytes(magic.0);
if magic != SWAP_MAGIC {
flash
.write(self.state.from as u32, &Aligned([0; 4]).0)
.await?;
flash
.erase(self.state.from as u32, self.state.to as u32)
.await?;
trace!(
"Setting swap magic at {} to 0x{:x}, LE: 0x{:x}",
self.state.from,
&SWAP_MAGIC,
&SWAP_MAGIC.to_le_bytes()
);
flash
.write(self.state.from as u32, &SWAP_MAGIC.to_le_bytes())
.await?;
}
Ok(())
}
@ -341,15 +347,21 @@ impl FirmwareUpdater {
#[repr(align(4))]
struct Aligned([u8; 4]);
flash
.write(self.state.from as u32, &Aligned([0; 4]).0)
.await?;
flash
.erase(self.state.from as u32, self.state.to as u32)
.await?;
flash
.write(self.state.from as u32, &BOOT_MAGIC.to_le_bytes())
.await?;
let mut magic = Aligned([0; 4]);
flash.read(self.state.from as u32, &mut magic.0).await?;
let magic = u32::from_le_bytes(magic.0);
if magic != BOOT_MAGIC {
flash
.write(self.state.from as u32, &Aligned([0; 4]).0)
.await?;
flash
.erase(self.state.from as u32, self.state.to as u32)
.await?;
flash
.write(self.state.from as u32, &BOOT_MAGIC.to_le_bytes())
.await?;
}
Ok(())
}