From 6782fb1efa1bd4c5372220bb38539ea1e7ef6ffa Mon Sep 17 00:00:00 2001
From: Priit Laes <plaes@plaes.org>
Date: Wed, 13 Dec 2023 11:41:46 +0200
Subject: [PATCH] embassy-boot: Add explanation to dfu vs active size assertion

---
 embassy-boot/boot/src/boot_loader.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/embassy-boot/boot/src/boot_loader.rs b/embassy-boot/boot/src/boot_loader.rs
index a8c19197..1663f4f2 100644
--- a/embassy-boot/boot/src/boot_loader.rs
+++ b/embassy-boot/boot/src/boot_loader.rs
@@ -224,6 +224,7 @@ impl<ACTIVE: NorFlash, DFU: NorFlash, STATE: NorFlash> BootLoader<ACTIVE, DFU, S
         assert_eq!(0, aligned_buf.len() % ACTIVE::WRITE_SIZE);
         assert_eq!(0, aligned_buf.len() % DFU::WRITE_SIZE);
 
+        // Ensure our partitions are able to handle boot operations
         assert_partitions(&self.active, &self.dfu, &self.state, Self::PAGE_SIZE);
 
         // Copy contents from partition N to active
@@ -398,6 +399,7 @@ fn assert_partitions<ACTIVE: NorFlash, DFU: NorFlash, STATE: NorFlash>(
 ) {
     assert_eq!(active.capacity() as u32 % page_size, 0);
     assert_eq!(dfu.capacity() as u32 % page_size, 0);
+    // DFU partition has to be bigger than ACTIVE partition to handle swap algorithm
     assert!(dfu.capacity() as u32 - active.capacity() as u32 >= page_size);
     assert!(2 + 2 * (active.capacity() as u32 / page_size) <= state.capacity() as u32 / STATE::WRITE_SIZE as u32);
 }