The b43 needs kmod-ssb. On the brcm47xx and brcm63xx target it is integrated into the kernel all other need the module.

SVN-Revision: 15195

package/mac80211/Makefile

@@ -347,7 +347,7 @@ define KernelPackage/b43-common
   $(call KernelPackage/mac80211/Default)
   TITLE:=Generic stuff for Broadcom wireless devices
   URL:=http://linuxwireless.org/en/users/Drivers/b43
-  DEPENDS+= +kmod-mac80211 @!LINUX_2_6_21||!LINUX_2_6_23||!LINUX_2_6_24
+  DEPENDS+= +kmod-mac80211 +!(TARGET_brcm47xx||TARGET_brcm63xx):kmod-ssb @!LINUX_2_6_21||!LINUX_2_6_23||!LINUX_2_6_24
 endef
 
 define KernelPackage/b43