The golang package is generated only for i386, amd64, armel, armhf and
kfreebsd-* architectures, because of upstream restrictions.

Quoting from upstream documentation (http://golang.org/doc/install.html):

    The Go compilers support three instruction sets.  There are
    important differences in the quality of the compilers for the
    different architectures.

    amd64 (a.k.a. x86-64); 6g,6l,6c,6a
        The most mature implementation. The compiler has an effective
        optimizer (registerizer) and generates good code (although
        gccgo can do noticeably better sometimes).

    386 (a.k.a. x86 or x86-32); 8g,8l,8c,8a
        Comparable to the amd64 port.

    arm (a.k.a. ARM); 5g,5l,5c,5a
        Incomplete. It only supports Linux binaries, the optimizer is
        incomplete, and floating point uses the VFP unit. However, all
        tests pass. Work on the optimizer is continuing. Tested
        against a Nexus One.

    Except for things like low-level operating system interface code,
    the run-time support is the same in all ports and includes a
    mark-and-sweep garbage collector (a fancier one is in the works),
    efficient array and string slicing, support for segmented stacks,
    and a strong goroutine implementation.

    The compilers can target the FreeBSD, Linux, and OS X
    (a.k.a. Darwin) operating systems.

 -- Ondřej Surý <ondrej@debian.org>, Thu, 28 Apr 2011 11:33:26 +0200