CONFIG_SSB_SDIOHOST_POSSIBLE (not configurable)

configname: CONFIG_SSB_SDIOHOST_POSSIBLE

Linux Kernel Configuration
└─>Device Drivers
└─>Sonics Silicon Backplane
└─>SSB_SDIOHOST_POSSIBLE
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  

is selected by
CONFIG_B43_SDIO