fix of osmoload, flashing c155 works

[Andreas Eversberg]

Sylvain Munaut wrote:
> 1) Can you make those patch over my testing branch instead ? The build
> system was completely reworked and the merge is going to suck if you
> change the makefile in master
can do that.
> 2) Your patch enables TX and flash write by default, that's bad.
forgot to remove it.

i will send you both patches after finishing.