--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/Freerunner-Howto	Sun May 10 19:35:29 2015 +0000
@@ -0,0 +1,57 @@
+How to play with FreeCalypso GSM firmware on a Neo Freerunner
+=============================================================
+
+Aside from the half-source leo2moko fw we produced back in 2013-10 (you can
+read all about that one at www.freecalypso.org/leo2moko/), we don't have a
+working free GSM firmware version for the Freerunner yet.  What we do have
+currently is experimental code that can be built into an image that can be
+flashed into a GTA02 modem - but it doesn't really work yet.
+
+If you would like to play with our experimental code on your Neo FR and maybe
+help us make it work, here are the instructions:
+
+1. Build the firmware in the gtamodem-gsm configuration - see the Compiling
+   document for more details;
+
+2. You should get a flashImage.bin image built; now you need to flash it into
+   your FR's modem.  The serial cable method is highly recommended: the only
+   thing you'll be able to do with our current non-working firmware is help us
+   debug it, and the serial cable will be needed for the latter part anyway.
+
+3. Run fc-loadtool the same way you would if you were flashing leo2moko;
+
+4. The actual flash programming commands are a little different because the
+   image is smaller and in a different format:
+
+flash erase 0 0x160000
+flash program-bin 0 finlink/flashImage.bin
+
+The second number in the flash erase command needs to be the size of
+flashImage.bin rounded up to a multiple of 64 KiB (the flash sector size in the
+GTA02 modem); 0x160000 is correct for the fw image size as of this writing, but
+please double-check it yourself before flashing.  The 0 argument in the
+flash program-bin command is the flash offset at which the image should be
+programmed: it will always be 0 for FreeCalypso flashable fw images for gtamodem
+and other targets that have the Calypso boot ROM enabled in the hardware.
+
+Once you have flashed our experimental fw into your modem, you can power-cycle
+the modem and see the new fw boot.  You should have the serial cable connected,
+the serial channel enabled from the Freerunner's AP side and either rvtdump or
+rvinterf running on your PC or other development machine when you first power
+your modem up with the experimental fw in it: this way you will see whether the
+fw boots successfully or crashes.  If it does boot without crashing (whether or
+not it does seems to depend on some factors which we have yet to understand),
+you will get an AT command interface on the other UART going to the Freerunner's
+AP - now go ahead and play from there. :)
+
+To reflash your modem back to stable and working leo2moko aka moko12, execute
+the following fc-loadtool commands:
+
+flash erase 0 0x230000
+flash program-m0 leo2moko.m0
+
+(Whichever firmware image you are flashing, the flash erase command needs to
+ cover the range of flash sectors this image will occupy.  You can erase more
+ sectors up to 0x300000, the "natural" boundary of the flash area where fw
+ images live, but I prefer to erase only the needed number of sectors: it is
+ both faster and imposes less wear on the flash.)