64-bit MIPS cross toolchain?

Hi,

Is there a cross 64-bit toolchain for MIPS that is being actively
maintained?  If so, are there any hardware boxes or emulators that will run
the binaries that are produced?

I've used the instructions at http://psas.pdx.edu/DebianCrossCompilerHowto/
to install the 'mipsel' gcc, but it produces mips32 binaries.

Any advice would be appreciated.  There's lots of info out there but much
of it seems to be old.  I'm beginning to wonder if this particular target
is still of interest to anyone else.

--Bob