README

bootloader/README.md

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+# Bootloader
+The bootloader is a small (~10K) application that occupies the first few pages of flash at 0x0800000.
+Its only purpose is to determine whether an application is installed by inspecting a certain flash page. 
+If the application is installed it just passes control to it, otherwise it enters UART software upload mode.
+
+When an upload completes, the bootloader writes the special metadata page and resets the system, which will 
+cause its next reincarnation to launch the application.
+
+When the application receives a command to start a "software update", it will simply erase the special metadata
+and reset the system, which will cause the bootloader to enter UART upload mode.
+
+