kernelconfig_penguin
default or selected kernelversion does not have config value CONFIG_B43_DMA_MODE.
Result is shown for kernelversion 2.6.24.7
selects
CONFIG_B43_DMA

DMA (Direct Memory Access) only

configname: CONFIG_B43_DMA_MODE

Broadcom 43xx data transfer mode
└─> DMA (Direct Memory Access) only

Only include Direct Memory Access (DMA).
This reduces the size of the driver module, by omitting the PIO code.