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+# MAIANA Bootloader
+
+This is a custom bootloader that installs at flash address 0x08000000. In addition to providing firmware updates, this bootloader
+also performs integrity checking and can even rescue a board if a bad application firmware binary is installed.
+
+## Installation
+
+The bootloader must be built and flashed via SWD. An alternative is to use the ST ROM bootloader to install the binary via UART. 
+This will require manipulation of the BOOT0 signal though, which is only exposed via a test pad for a bed-of-nails fixture.
+
+## Firmware update
+
+All application firmware must be isntalled via UART. See the example script in the Python subdirectory for the protocol.
+
+## Integrity checking
+
+This bootloader maintains a metadata page at flash address 0x08004000. It holds the size and checksum of the installed application image (if any). 
+The application image must be linked for installation at address 0x08004800. If no application is present or the checksum fails, the bootloader enters
+DFU mode automatically.
+
+## Rescue mode
+
+If the TX switch is toggled twice during the first 2.5 seconds after power-up, the bootloader enters DFU mode again, regardless of application firmware state.
+
+