linux-kernel - Re: [2.6.26-rc4] Problems with rt2x00 USB interface on powerpc (fwd)

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Message-Id: <200806292051.56596.IvDoorn@gmail.com>
Date:	Sun, 29 Jun 2008 20:51:56 +0200
From:	Ivo van Doorn <ivdoorn@...il.com>
To:	Rogério Brito <rbrito@....usp.br>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org, rt2400-devel@...ts.sourceforge.net
Subject: Re: [2.6.26-rc4] Problems with rt2x00 USB interface on powerpc (fwd)

Hi,

[Added rt2400-devel to CC list]

> > > > Did you receive my earlier message (attached here for reference)? I'm
> > > > willing to experiment with the driver a little bit and I hope that the
> > > > information that I have provided so far is helpful to chase the reason
> > > > why the driver doesn't work on PowerPC.
> > > 
> > > Sorry I have been quite busy with other things.
> > 
> > I'm terribly sorry for that, since I would like the driver to work with
> > the USB stick still in the 2.6.26 release (since that's what some
> > distributions will probably use).
> 
> Just for your information, I just compiled the -rc7 kernel on x86-64 (where
> rt2500usb works if I boot with kernel 2.6.25) and still doesn't work (I'm
> not even mentioning here PowerPC).

In case other people are interested in the register differences as well,
attached is the real difference between the registers. Registers that are
different have the register name and meaning on the right side.

Interesting things to note:
 - SIFS/EIFS timing is different, which is expected since rt2500usb now
    listens to mac80211 for this information.
 - Activity led is disabled, not interesting for this bug, but it really should have
   been set to 1.
 - mac80211 now uses short preamble
 - Basic rates mask is 0, this is very odd....
 - Link tuner value is set to 0, I seriously doubt that is a correct value
 - TX power is different, mac80211 probably has set it to something different

Thats it for now, if anybody has any ideas, please let me know. :)

Ivo

View attachment "diff.rt2500usb.txt" of type "text/plain" (22636 bytes)