Date:	Sun, 8 Jun 2008 18:35:13 -0300
From:	Rogério Brito <rbrito@....usp.br>
To:	Ivo van Doorn <ivdoorn@...il.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org,
	Rogério Theodoro de Brito 
	<rbrito@....usp.br>
Subject: Re: [2.6.26-rc4] Problems with rt2x00 USB interface on powerpc

Hi, Ivo.

First of all, thank you so much for helping with this issue. It is
greatly appreciated.

On Jun 08 2008, Ivo van Doorn wrote:
> Hi,
> 
> > Unfortunately, this patch won't even apply with 2.6.26-rc5 as the code
> > seems to have changed a lot between that date and today. For instance,
> > there doesn't seem to exist a function called "rt2500usb_config_mac_addr"
> > in the rt2x00 directory (just did a grep on my unconnected iBook).
> 
> That patch was a bugfix for 2.6.25. The bug it fixed isn't present in
> the 2.6.26 cycle.

Nice to know that. I saw that the code has changed quite a good amount...

Anyway, I don't know if you saw the various outputs that I put at my
homepage (lots of dmesgs with the 2.6.26-rc4 kernel):
http://www.ime.usp.br/~rbrito/debug/

(Not included here because the list has limits on the size of e-mails, AFAIK).

> > > Just as a refresher:
> > > 
> > > * I can set everything on the iBook with the wireless key plugged;
> > > * The wireless key *sees* the AP, even with encryption (that is, it grabs
> > >   the MAC address of the AP, it (sometimes) shows me the signal strength,
> > >   and if I issue "iwconfig wlan0 ap any", I see both the led of the
> > >   wireless key blink and an increase of amount of data transmitted and
> > >   received with "ifconfig wlan0");

Just a comment here: it seems that with the -rc5 kernel I don't get
always the wireless key seeing the AP... Sometimes it shows "Not
Associated". I will try to reproduce that with an -rc4 kernel again.

> > > * With everything set this way, if I do "dhclient wlan0", it doesn't get a
> > >   lease from the AP---actually, despite the fact that it is possible to see
> > >   the other point, dhclient goes, after some attempts of getting a lease,
> > >   to background, but no address is ever gotten;
> > > * Just to rule out possible problems with something sent to the address
> > >   255.255.255.255 (which is reported as being done by dhclient), I tried to
> > >   configure the address by hand via ifconfig, but, for instance, I couldn't
> > >   ping my AP (which I can from other computers with a rt61pci driver and a
> > >   PCMCIA connection);
> > > * As I mentioned above, I have no problems with the rt61pci driver, but the
> > >   USB one doesn't seem to work (unfortunately, the iBook does not have a
> > >   PCMCIA slot). With a notebook with an on-board Intel wireless card, I
> > >   *also* don't have any problems.
> > > 
> > > Well, thanks, for the help so far. I hope that we can solve this issue
> > > quite soon, as I need this iBook for work.
> > > 
> > > I am willing to help as much as I can and test anything (even something
> > > that might be "experimental"). I think that this is as good a tester that
> > > you can get, right? :-)
> > 
> > Again, I am willing to test any "intrusive" change as I still don't have
> > valuable data on that machine. BTW, I have firmware from Debian's
> > ralink-firmware package (which should be what ralink has released)
> > installed on this machine.
> > 
> > I don't know if the firmware is needed in my case or not, though (my USB
> > adaptor is a D-Link DWL-G122 H/W Ver. B1, F/W Ver.: 2.03---took that info
> > from the back of the stick).
> 
> Which driver is actually being used? rt2500usb or rt73usb?

The driver that actually gets loaded is rt2500usb. I tried rmmod'ing
rt2500usb and loading rt73usb, but a quick iwconfig doesn't even show
the interfaces.

> Also what was the last kernel version on which the driver worked for
> you?

Unfortunately, I don't have any kernel for which this has worked for
me. I just did an experiment: I plugged the adaptor on a ia32 notebook
where a rt61pci works fine (it is running Ubuntu's Hardy---well,
actually, there are some problems, but I can get to that latter), but
the USB key was non working with the symptoms that I described above.

> If there was a last known working kernel, could you download the debugfs script:
> 	http://rt2x00.serialmonkey.com/phpBB/download/file.php?id=1969
> enable debugfs and MAC80211_DEBUGFS and RT2X00_LIB_DEBUGFS in your kernel,
> and run the script to dump all registers from the hardware to a file?

I just grabbed the script. Here is the output with the options enabled
and the results are attached here.

> Please do this for both the working kernel as the non-working kernel
> so I can see if there is a register initialization problem which could
> have been triggered by an endian-problem.

That was my first suspicion: and endianess problem. But now I am not so
sure.


Thanks again, Rogério Brito.

-- 
Rogério Brito : rbrito@...ckenzie,ime.usp}.br : GPG key 1024D/7C2CAEB8
http://www.ime.usp.br/~rbrito : http://meusite.mackenzie.com.br/rbrito
Projects: algorithms.berlios.de : lame.sf.net : vrms.alioth.debian.org

View attachment "output-regdump.txt" of type "text/plain" (3665 bytes)

View attachment "ifconfig-wlan0.txt" of type "text/plain" (325 bytes)

View attachment "iwlist-wlan0-scan.txt" of type "text/plain" (561 bytes)

View attachment "iwconfig-wlan0.txt" of type "text/plain" (463 bytes)

Download attachment "levanta.sh" of type "application/x-sh" (116 bytes)

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