python 3.6 is a prerequisite for nmigen however something
weird is going on, and it can't be installed. instead,
python 3.7 has to be installed instead. we do this by
-adding debian/testing and
+adding debian/testing but setting the default release
+as "stretch".
as root, in the
chroot, add the following to /etc/apt/sources.list
yosys in debian/stretch may not be enough to work with nmigen,
therefore it's probably a good idea to upgrade. if this was
-not a debian/stretch chroot, it would be a simple matter of
-"apt-get install yosys" however it's probably best, here to
-install from source.
+not a debian/stretch chroot (i.e. was a debian 10), it would be
+a simple matter of "apt-get install yosys" however it's probably best,
+here to install from source.
**however**.. there is another way: once the instructions
for installing python3.7 have been carried out. As root,