[U-Boot] buildman: selection question

[Steve Rae]

question:
Two of the boards that I support are almost the same:
Active  arm         armv7       bcm281xx    broadcom
bcm28155_ap         bcm28155_ap                           -
Active  arm         armv7       bcm281xx    broadcom
bcm28155_ap         bcm28155_w1d
bcm28155_ap:BCM_SF2_ETH,BCM_SF2_ETH_GMAC

Using "buildman" how can I build the first one (without always building
the second one too?)