Hi, Type the following command to get more diagnostic information:
$ lsusb -a
The Ralink RT2571WF USB Wifi module chipeset requires 300mA of power to
function properly. Your USB port might not have sufficient power to activate
the USB device using your current USB OTG port. This was the same in my
case, using a gumstix Overo Earth TI OMAP 3503 wifi module + palo43 board,
whose USB port could only supply 100mA on each port.
Even if you use a USB hub, you really need to make sure that it can supply
300mA of power on each USB port or mode.
In the case of this specific hardware configuration, power was separately
applied from an external power source, and the kernel limit was increased by
applying the following patch:
diff --git a/drivers/usb/host/sl811_cs.c b/drivers/usb/host/sl811_cs.c
index 516848d..73c3598 100644
--- a/drivers/usb/host/sl811_cs.c
+++ b/drivers/usb/host/sl811_cs.c
@@ -82,7 +82,7 @@ static void release_platform_dev(struct device * dev)
static struct sl811_platform_data platform_data = {
.potpg = 100,
- .power = 50, /* == 100mA */
+ .power = 200, /* == 400mA */
// .reset = ... FIXME: invoke CF reset on the card
};
Best regards,
Elvis
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