$ lua build_elua.lua board=et-stm32 burn /dev/ttyUSB0
will invoke stm32ld (the default for stm32's platform 'burn' target) on port /dev/ttyUSB0.
I really have to document all this stuff somewhere. Don't panic though, for now you can use the old build system exactly like you used it before :)
- added support for per-backend targets. avr32 now has a 'burn' target (besides the regular 'prog') that can be used to build the image and burn it to the board (lua build_elua.lua board=atevk1100 burn). It is created in 'conf.lua'
- other fixes and improvements to the build system