Sorry for the late reply (you probably already found out by now).
Did you add the path of your toolchain to the PATH environment variable ?
For instance in your .bashrc, try adding this as the last line…
export PATH=”/path/to/toolchain:$PATH”
… where ‘/path/to/toolchain’ points to the ‘bin’ directory of your toolchain, example: “$HOME/toolchain/bin”
… then open up a new terminal window and try this command:
which aarch64-marvell-linux-gnu-gcc
-if it reports the path of the binary, then it should work.