On 09/27/2011 10:36 AM, Ian Jeffray wrote:
Dear all, I'm attempting to get some sense from a Realtek 8191S device on ARM linux. Using the latest kernel/drivers (3.0.4) I've had great success on x86 linux, achieving 94Mbit throughput. On ARM linux, however, the device is barely working. I can bring up the firmware (using the 20110818 firmware package): usb 1-1: new high speed USB device using musb-hdrc and address 2 usb 1-1: New USB device found, idVendor=0bda, idProduct=8172 usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-1: Product: RTL8191S WLAN Adapter usb 1-1: Manufacturer: Manufacturer Realtek usb 1-1: SerialNumber: 00e04c000001 r8712u: DriverVersion: v7_0.20100831 r8712u: register rtl8712_netdev_ops to netdev_ops r8712u: USB_SPEED_HIGH with 4 endpoints r8712u: Boot from EFUSE: Autoload OK r8712u: CustomerID = 0x0000 r8712u: MAC Address from efuse = 00:02:72:a7:12:47 # ifconfig wlan0 up r8712u: Loading firmware from "rtlwifi/rtl8712u.bin" r8712u: 1 RCR=0x153f00e r8712u: 2 RCR=0x553f00e I then attempt some basic operations such as an SSID scan. At this point, I occasionally get a result, but more often than not, I get no results at all. There are 7 access points around me, so it's surprising to get nothing.
That is what one might expect if the probe messages for the scan are not being sent, and you are ending up with effectively a passive scan.
Attempting to forcibly connect to anything is also fruitless. My host is a TI DaVinci DM8168 (OMAP3+toys). The USB host is not fantastic, but has been thrashed heavily with other devices and seems to be reliable in those cases. I'd appreciate any input and guidance as to what may be the issue here. There doesn't appear to be a great deal of debug info to be enabled in the driver, so I'm not sure what more I can add at this point to aid with resolving the problem. I fear some long days of pain trying to track down differences in operation for this device between ARM and x86. Could I ask if anyone can actually confirm (or deny) this particular driver/chipset works with an ARM host?
I have not tried this chip on an ARM host as I have no hardware. My testing has been with X86 and PPC - thus I know the endianess is OK, but that is the extent of my platform testing.
The first thing I would try is wireshark on another host to verify that packets are actually getting on the air.
Larry -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
