From 4b9d886fa4e703dd48f1448481aaa7a30f23d6a2 Mon Sep 17 00:00:00 2001
From: praveena-a-s <pravena15@gmail.com>
Date: Tue, 13 May 2014 20:12:58 +0530
Subject: [PATCH] Update readme.txt

---
 bootloaders/zero/readme.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/bootloaders/zero/readme.txt b/bootloaders/zero/readme.txt
index 7835157f..688a4ad2 100644
--- a/bootloaders/zero/readme.txt
+++ b/bootloaders/zero/readme.txt
@@ -11,4 +11,9 @@ SAM_BA_BOTH_INTERFACES for enabling both the interfaces
 
 SAM_BA_INTERFACE value should be modified in
 Project Options -> C/C++ Compiler -> Preprocessor -> Defined symbols
-Project Options -> Assembler -> Preprocessor -> Defined symbols
\ No newline at end of file
+Project Options -> Assembler -> Preprocessor -> Defined symbols
+
+3- Start application check
+
+Bootloader checks for the state of BOOT_LOAD_PIN (configurable by the user from main.h). If BOOT_LOAD_PIN is pulled low, bootloader execution is resumed.
+Else, the first location of application is fetched and checked. If it is empty (0xFFFFFFFF), then bootloader execution is resumed. Else it jumps to application and starts execution from there.
-- 
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