One of those features must be always present.
The feature that is present determines which flavor of m68k is
used. The feature that is present should contain registers
`d0' through `d7', `a0' through `a5', `fp',
`sp', `ps' and `pc'.
`org.gnu.gdb.coldfire.fp'
This feature is optional. If present, it should contain registers
`fp0' through `fp7', `fpcontrol', `fpstatus' and
`fpiaddr'.