[Gta04-owner] Host AP mode

Butrus Damaskus butrus.butrus at gmail.com
Wed May 30 00:13:26 CEST 2012


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?

> Best regards,
>  Christoph
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