Unzip the linux kernel source code to the host PC, use command:

#tar xvfj linux-2.6.25.8.tar.bz2 -C /opt/EmbedSky

or:

#tar xvfj linux-2.6.30.4.tar.bz2 -C /opt/EmbedSky/

After that, the linux kernel source code is unzipped to /opt/EmbedSky in host PC.

Note: the the package EmbedSky provides, the unzip command is:

#tar xvfj xxxxx.tar.bz2 -C /