[Gta04-owner] Host AP mode

Christoph Mair christoph.mair at gmail.com
Wed May 30 08:13:17 CEST 2012


On Wed, May 30, 2012 at 12:13 AM, Butrus Damaskus
<butrus.butrus at gmail.com> wrote:
> On Tue, May 29, 2012 at 11:11 PM, Christoph Mair
> <christoph.mair at gmail.com> wrote:
>> On Tue, May 29, 2012 at 10:45 PM, Andreas Kemnade <andreas at kemnade.info> wrote:
>>> Hi,
>>>
>>> I found out that
>>> http://corysohrakoff.wordpress.com/2011/09/13/enabling-wifi-ap-mode-on-a-gumstix-overo/
>>> is a good howto about host ap mode.
>>> It is about using an alternate driver for the wifi chipset (libertas_tf)
>>> which uses a thinner firmware, so the host can do ap mode. I could
>>> configure hostapd so that I have an unencrypted accesspoint.
>>> The libertras_tf driver needs some
>>> #include <linux/module.h> to work with 3.2 kernel. I have used hostapd
>>> version 1.0.
>>> Normal infrastructure mode does also work.
>>
>> Great! The last time I gave it a try I could not connect to my
>> network; scanning worked fine.
>>
>>> But my earlier mentioned wifi performance problem with 3.x, which does
>>> not exist in 2.6.32, is not better with the libertas_tf driver.
>>> Could the SD/MMC host driver be the bottleneck?
>>
>> I tried to debug the MMC interface and found out that the chip
>> interface runs at 25MHz. I've read somewhere that the module should
>> support up to 50MHz but I could not convince the module to use this
>> speed. Anyways, 25MHz with a 4 bits wide interface should be enough
>> for everyone [TM].
>>
>> Unfortunately I could not find out why the chip does not use higher
>> data rates than 5MBit/s. I've seen very short periods where iwconfig
>> displayed higher data rates (up to 48MBits/s) but the value returned
>> immediately to 5MBits/s when I called iwconfig again (a few times).
>
>
> What is the signal strength/quality?

I can't remember exactly, but I also tested it standing next to the AP (2m).

Christoph


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