+@cindex @samp{-march=} command line option, M680x0
+@item -march=@var{architecture}
+This option specifies a target architecture. The following
+architectures are recognized:
+@code{68000},
+@code{68010},
+@code{68020},
+@code{68030},
+@code{68040},
+@code{68060},
+@code{cpu32},
+@code{isaa},
+@code{isaaplus},
+@code{isab} and
+@code{cfv4e}.
+
+
+@cindex @samp{-mcpu=} command line option, M680x0
+@item -mcpu=@var{cpu}
+This option specifies a target cpu. When used in conjunction with the
+@option{-march} option, the cpu must be within the specified
+architecture. Also, the generic features of the architecture are used
+for instruction generation, rather than those of the specific chip.
+
+@cindex @samp{-m[no-]68851} command line option, M680x0
+@cindex @samp{-m[no-]68881} command line option, M680x0
+@cindex @samp{-m[no-]div} command line option, M680x0
+@cindex @samp{-m[no-]usp} command line option, M680x0
+@cindex @samp{-m[no-]float} command line option, M680x0
+@cindex @samp{-m[no-]mac} command line option, M680x0
+@cindex @samp{-m[no-]emac} command line option, M680x0
+@item -m[no-]68851
+@item -m[no-]68881
+@item -m[no-]div
+@item -m[no-]usp
+@item -m[no-]float
+@item -m[no-]mac
+@item -m[no-]emac
+
+Enable or disable various architecture specific features. If a chip
+or architecture by default supports an option (for instance
+@option{-march=isaaplus} includes the @option{-mdiv} option),
+explicitly disabling the option will override the default.
+