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+# Toolchain
+
+Install the GCC ARM toolchain from [https://code.launchpad.net/gcc-arm-embedded](https://code.launchpad.net/gcc-arm-embedded).  (Other toolchains exist. YMMV).  All you have to do is unpack the archive and add the bin directory to your path.
+
+# libopencm3
+
+Download and install from mossmann's fork: [https://github.com/mossmann/libopencm3](https://github.com/mossmann/libopencm3)
+
+In the future, the LPC43xx support will hopefully be available upstream, but for now you will need the fork.
+
+With your PATH set as above, simply do a make and make install.
+
+# HackRF firmware
+
+You should now be able to cd into one of the HackRF firmware directories (try blinky first) and type make.
+
+The resulting .bin file can be programmed directly onto the SPI flash with a GoodFET or Bus Pirate, or you can use a debugger.
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