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CONFIG_BCM43XX_PIO_MODE: PIO (Programmed I/O) only

General informations

The Linux kernel configuration item CONFIG_BCM43XX_PIO_MODE:

Help text

Only include Programmed I/O (PIO). This reduces the size of the driver module, by omitting the DMA code. Please note that PIO transfers are slow (compared to DMA).

Also note that not all devices of the 43xx series support PIO. The 4306 (Apple Airport Extreme and others) supports PIO, while the 4318 is known to _not_ support PIO.

Only use PIO, if DMA does not work for you.

Hardware

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