From the README.md at https://github.com/sifive/freedom-e-sdk
Compiled successfully:
:~$ git clone --recursive https://github.com/sifive/freedom-e-sdk.git
:~$ cd freedom-e-sdk
:~$ make tools BOARD=freedom-e300-hifive1 -j4
Attempt to uninstall and recompile fails:
:~/freedom-e-sdk$ make uninstall
make: *** No rule to make target ‘uninstall’. Stop.
–WM