. flash tool
 . test support for reading
 . writing is not working. refer to the specs, may have changed for stm32l
 . then test with blink_flash example
 . then update the documentation

. documentation
 . make README points to doc/tutorial

. remove libsg dependency using:
https://github.com/afaerber/stlink/tree/master/libstlink

. compile and test a realtime kernel, for instance:
http://www.chibios.org/dokuwiki/doku.php?id=chibios:articles:stm32l_discovery
svn checkout https://chibios.svn.sourceforge.net/svnroot/chibios/trunk ;
cd chibios/trunk/demos/ARMCM3-STM32L152-DISCOVERY ;
make ;