[PATCH] bcm43xx: add a note that not all devices support PIO.

Signed-off-by: Michael Buesch <mbuesch@freenet.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/wireless/bcm43xx/Kconfig b/drivers/net/wireless/bcm43xx/Kconfig
index d8d23155ee3c..1d677c15b21c 100644
--- a/drivers/net/wireless/bcm43xx/Kconfig
+++ b/drivers/net/wireless/bcm43xx/Kconfig
@@ -52,6 +52,11 @@ config BCM43XX_PIO_MODE
           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.
 
 endchoice