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Date:	Tue, 8 Jul 2008 00:55:12 -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, rt2400-devel@...ts.sourceforge.net,
	rbrito@....usp.br, Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [2.6.26-rc4] Problems with rt2x00 USB interface on powerpc (fwd)

Hi, all. (And Hi Linus!)

On Jun 29 2008, Ivo van Doorn wrote:
> Rogério Brito wrote:
> > 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).

Just to reiterate, for both Ivo and John and people on the rt2400 list
(who may not seem my earlier problem reports that went back and forth with
Ivo), I'm willing to test any tree to get the driver working with my D-Link
DWL-G122 stick revision B (which actually works with with the rt2500usb
driver, if I boot with kernel 2.6.25, as mentioned above, but has problems
with 2.6.26-rc* kernels).

I was a bit busy with the lame project (we have just released a new
upstream release, 3.98, after two years of work!) and I have not kept up
with testing the -rc8 and -rc9 kernels that Linus released in the interim,
but I am downloading the patches so that I can see their behavior.

Actually, I did some tests with 2.6.25.4 (which is the kernel that I am
using on my x86-64, pending and update soon to 2.6.25.10 or whatever is the
point-release du jour) and I was very happy to see that I don't need the
non-free firmware from ralink.

Just as a reminder: with 2.6.25.4, I can work with it on x86-64, but not
with PowerPC. With recent 2.6.26-rc* kernels, it stopped working on x86-64
also. :(

Unfortunately, I may be moving in the near future and I would like to bring
my iBook G3 laptop with me (even if dated) so that I can continue my work
on some projects and the only way to connect and to work on then would be
with the USB stick, as I won't probably have wired conection.

Right now, I am unable to connect to the network with the USB stick, as Ivo
mentioned, due to some register differences, which I keep here (see below)
for reference (sorry for the long e-mail, but this is to keep the context
as we have already entered another month and the issue is not fixed and I
hope that Linus won't release the final 2.6.26 yet, as this kernel will
most probably be the one used by some distributions).

As Linus mentioned on
<alpine.LFD.1.10.0807051557500.3016@...dy.linux-foundation.org>, he would
like a lot of people testing the changes---no, this bug submitter has not
been kidnapped :)---and this is what I am trying to do (actually, I'm
willing to do git bisect, test new trees---you name it).

Oh, just as a last piece of information, the USB wireless stick works fine
if I boot MacOS X, but Apple has dropped the support for older PowerPC
machines (and even some not so old ones :( ), this is one reason more for
me to want a working Linux release.


Thanks in advance to everybody, Rogério Brito.

P.S.: Here follows Ivo's comments on the register differences taken from
debugfs: 

> 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

> 2.6.25.4-1                                                    | 2.6.26-rc5-2
> driver: rt2500usb                                               driver: rt2500usb
> version: 2.0.14                                               | version: 2.1.4
> compiled: Jun 13 2008 01:33:03                                | compiled: Jun  8 2008 17:08:54
> dev_flags: 0x0001012f                                         | dev_flags: 0x00000e2f
> rt chip: 1201                                                   rt chip: 1201
> rf chip: 0005                                                   rf chip: 0005
> revision:00000005                                               revision:00000005
> 
> csr length: 128                                                 csr length: 128
> eeprom length: 53                                               eeprom length: 53
> bbp length: 96                                                  bbp length: 96
> rf length: 5                                                    rf length: 5
> 
> csr                                                             csr
> 0 :0x0005                                                       0 :0x0005
> 1 :0x0004                                                       1 :0x0004
> 2 :0x1300                                                       2 :0x1300
> 3 :0xe946                                                       3 :0xe946
> 4 :0x8a8d                                                       4 :0x8a8d
> 5 :0x1300                                                       5 :0x1300
> 6 :0x5146                                                       6 :0x5146
> 7 :0x6510                                                       7 :0x6510
> 8 :0x0980                                                       8 :0x0980
> 9 :0xff1d                                                       9 :0xff1d
> 10 :0x0014                                                      10 :0x0014
> 11 :0x0005                                                    | 11 :0x000a	MAC_CSR11: SIFS.
> 12 :0x016c                                                    | 12 :0x013a	MAC_CSR12: EIFS.
> 13 :0x1111                                                      13 :0x1111
> 14 :0x1e11                                                      14 :0x1e11
> 15 :0x01ee                                                      15 :0x01ee
> 16 :0x0000                                                      16 :0x0000
> 17 :0x01fe                                                      17 :0x01fe
> 18 :0x005a                                                      18 :0x005a
> 19 :0xff00                                                      19 :0xff00
> 20 :0x0003                                                    | 20 :0x0002	MAC_CSR20: LED control register.
> 21 :0x1e46                                                      21 :0x1e46
> 22 :0x0053                                                      22 :0x0053
> 23 :0x0000                                                      23 :0x0000
> 24 :0x0000                                                      24 :0x0000
> 25 :0x0000                                                      25 :0x0000
> 26 :0x0000                                                      26 :0x0000
> 27 :0x0000                                                      27 :0x0000
> 28 :0x0000                                                      28 :0x0000
> 29 :0x0000                                                      29 :0x0000
> 30 :0x0000                                                      30 :0x0000
> 31 :0x0000                                                      31 :0x0000
> 32 :0x1ec0                                                      32 :0x1ec0
> 33 :0xb11a                                                    | 33 :0xb162	TXRX_CSR1: TX configuration.
> 34 :0x007e                                                      34 :0x007e
> 35 :0xb3af                                                      35 :0xb3af
> 36 :0xb3aa                                                      36 :0xb3aa
> 37 :0x8c8d                                                      37 :0x8c8d
> 38 :0x8b8a                                                      38 :0x8b8a
> 39 :0x8687                                                      39 :0x8687
> 40 :0x0085                                                      40 :0x0085
> 41 :0x0162                                                      41 :0x0162
> 42 :0x000e                                                    | 42 :0x000a	TXRX_CSR10: Auto responder control.
> 43 :0x015f                                                    | 43 :0x0000	TXRX_CSR11: Auto responder basic rate.
> 44 :0x140a                                                      44 :0x140a
> 45 :0x7038                                                      45 :0x7038
> 46 :0x0c13                                                      46 :0x0c13
> 47 :0x0609                                                      47 :0x0609
> 48 :0x0305                                                      48 :0x0305
> 49 :0x0203                                                      49 :0x0203
> 50 :0xfa00                                                      50 :0xfa00
> 51 :0x0003                                                    | 51 :0x000b	TXRX_CSR19: Synchronization control register.
> 52 :0x0003                                                      52 :0x0003
> 53 :0xe78f                                                      53 :0xe78f
> 54 :0x0000                                                      54 :0x0000
> 55 :0x0000                                                      55 :0x0000
> 56 :0x0000                                                      56 :0x0000
> 57 :0x0000                                                      57 :0x0000
> 58 :0x0000                                                      58 :0x0000
> 59 :0x0000                                                      59 :0x0000
> 60 :0x0000                                                      60 :0x0000
> 61 :0x0000                                                      61 :0x0000
> 62 :0x0000                                                      62 :0x0000
> 63 :0x0000                                                      63 :0x0000
> 64 :0x0000                                                      64 :0x0000
> 65 :0x0000                                                      65 :0x0000
> 66 :0x0000                                                      66 :0x0000
> 67 :0x0000                                                      67 :0x0000
> 68 :0x0000                                                      68 :0x0000
> 69 :0x0000                                                      69 :0x0000
> 70 :0x0000                                                      70 :0x0000
> 71 :0x0000                                                      71 :0x0000
> 72 :0x0000                                                      72 :0x0000
> 73 :0x0000                                                      73 :0x0000
> 74 :0x0000                                                      74 :0x0000
> 75 :0x0000                                                      75 :0x0000
> 76 :0x0000                                                      76 :0x0000
> 77 :0x0000                                                      77 :0x0000
> 78 :0x0000                                                      78 :0x0000
> 79 :0x0000                                                      79 :0x0000
> 80 :0x0000                                                      80 :0x0000
> 81 :0x0000                                                      81 :0x0000
> 82 :0x0000                                                      82 :0x0000
> 83 :0x0000                                                      83 :0x0000
> 84 :0x0000                                                      84 :0x0000
> 85 :0x0000                                                      85 :0x0000
> 86 :0x0000                                                      86 :0x0000
> 87 :0x0000                                                      87 :0x0000
> 88 :0x0000                                                      88 :0x0000
> 89 :0x0000                                                      89 :0x0000
> 90 :0x0000                                                      90 :0x0000
> 91 :0x0000                                                      91 :0x0000
> 92 :0x0000                                                      92 :0x0000
> 93 :0x0000                                                      93 :0x0000
> 94 :0x0000                                                      94 :0x0000
> 95 :0x0000                                                      95 :0x0000
> 96 :0x1221                                                      96 :0x1221
> 97 :0x0003                                                      97 :0x0003
> 98 :0x0000                                                      98 :0x0000
> 99 :0x0000                                                      99 :0x0000
> 100 :0x000f                                                     100 :0x000f
> 101 :0x8206                                                     101 :0x8206
> 102 :0x821e                                                     102 :0x821e
> 103 :0x9160                                                   | 103 :0x9100	PHY_CSR7: BBP access register 0.
> 104 :0x0000                                                     104 :0x0000
> 105 :0x0e07                                                     105 :0x0e07
> 106 :0x5400                                                     106 :0x5400
> 107 :0x0000                                                     107 :0x0000
> 108 :0x0000                                                     108 :0x0000
> 109 :0x0000                                                     109 :0x0000
> 110 :0x0000                                                     110 :0x0000
> 111 :0x0000                                                     111 :0x0000
> 112 :0x0000                                                   | 112 :0x032c	STA_CSR0: FCS error count.
> 113 :0x01a9                                                   | 113 :0xfb58	STA_CSR1: PLCP error count.
> 114 :0x0038                                                   | 114 :0x6311	STA_CSR2: LONG error count.
> 115 :0x0000                                                   | 115 :0x0a1f	STA_CSR3: CCA false alarm.
> 116 :0x0000                                                     116 :0x0000
> 117 :0x0000                                                     117 :0x0000
> 118 :0x0169                                                   | 118 :0x0000	STA_CSR6
> 119 :0x0011                                                   | 119 :0x0000	STA_CSR7
> 120 :0x0000                                                     120 :0x0000
> 121 :0x0000                                                     121 :0x0000
> 122 :0x0a01                                                   | 122 :0x02e1	STA_CSR10
> 123 :0x0000                                                     123 :0x0000
> 124 :0x0000                                                     124 :0x0000
> 125 :0x0000                                                     125 :0x0000
> 126 :0x0000                                                     126 :0x0000
> 127 :0x0000                                                     127 :0x0000
> 
> eeprom                                                          eeprom
> 0 :0x2570                                                       0 :0x2570
> 1 :0x0104                                                       1 :0x0104
> 2 :0x1300                                                       2 :0x1300
> 3 :0xe946                                                       3 :0xe946
> 4 :0x8a8d                                                       4 :0x8a8d
> 5 :0xffff                                                       5 :0xffff
> 6 :0xffff                                                       6 :0xffff
> 7 :0xffff                                                       7 :0xffff
> 8 :0xffff                                                       8 :0xffff
> 9 :0xffff                                                       9 :0xffff
> 10 :0xffff                                                      10 :0xffff
> 11 :0x2829                                                      11 :0x2829
> 12 :0xfff0                                                      12 :0xfff0
> 13 :0x00ff                                                      13 :0x00ff
> 14 :0x112c                                                      14 :0x112c
> 15 :0x1518                                                      15 :0x1518
> 16 :0x1618                                                      16 :0x1618
> 17 :0x3e00                                                      17 :0x3e00
> 18 :0xffff                                                      18 :0xffff
> 19 :0xffff                                                      19 :0xffff
> 20 :0xffff                                                      20 :0xffff
> 21 :0xffff                                                      21 :0xffff
> 22 :0xffff                                                      22 :0xffff
> 23 :0xffff                                                      23 :0xffff
> 24 :0xffff                                                      24 :0xffff
> 25 :0xffff                                                      25 :0xffff
> 26 :0xffff                                                      26 :0xffff
> 27 :0xffff                                                      27 :0xffff
> 28 :0xffff                                                      28 :0xffff
> 29 :0xffff                                                      29 :0xffff
> 30 :0x1717                                                      30 :0x1717
> 31 :0x1717                                                      31 :0x1717
> 32 :0x1717                                                      32 :0x1717
> 33 :0x1717                                                      33 :0x1717
> 34 :0x1617                                                      34 :0x1617
> 35 :0x1616                                                      35 :0x1616
> 36 :0x1616                                                      36 :0x1616
> 37 :0xffff                                                      37 :0xffff
> 38 :0xffff                                                      38 :0xffff
> 39 :0xffff                                                      39 :0xffff
> 40 :0xffff                                                      40 :0xffff
> 41 :0xffff                                                      41 :0xffff
> 42 :0xffff                                                      42 :0xffff
> 43 :0xffff                                                      43 :0xffff
> 44 :0xffff                                                      44 :0xffff
> 45 :0xffff                                                      45 :0xffff
> 46 :0xffff                                                      46 :0xffff
> 47 :0xffff                                                      47 :0xffff
> 48 :0x0032                                                      48 :0x0032
> 49 :0x6880                                                      49 :0x6880
> 50 :0x3850                                                      50 :0x3850
> 51 :0x6f5f                                                      51 :0x6f5f
> 52 :0xff37                                                    | 52 :0xfa00
> 
> bbp                                                             bbp
> 0 :0x13                                                         0 :0x13
> 1 :0x45                                                       | 1 :0x55
> 2 :0x1e                                                       | 2 :0x06	R2: TX antenna control
> 3 :0x02                                                         3 :0x02
> 4 :0x19                                                         4 :0x19
> 5 :0x09                                                       | 5 :0x0b
> 6 :0x00                                                       | 6 :0x10
> 7 :0x0e                                                       | 7 :0x00
> 8 :0x00                                                         8 :0x00
> 9 :0x00                                                         9 :0x00
> 10 :0x00                                                        10 :0x00
> 11 :0x04                                                        11 :0x04
> 12 :0x00                                                      | 12 :0x01
> 13 :0x70                                                      | 13 :0xa8
> 14 :0x1a                                                        14 :0x1a
> 15 :0x30                                                        15 :0x30
> 16 :0xac                                                        16 :0xac
> 17 :0x60                                                      | 17 :0x00
> 18 :0x18                                                        18 :0x18
> 19 :0xff                                                        19 :0xff
> 20 :0x1e                                                        20 :0x1e
> 21 :0x18                                                        21 :0x18
> 22 :0x18                                                        22 :0x18
> 23 :0x08                                                        23 :0x08
> 24 :0x68                                                      | 24 :0x80
> 25 :0x38                                                      | 25 :0x50
> 26 :0x08                                                        26 :0x08
> 27 :0x23                                                        27 :0x23
> 28 :0x18                                                        28 :0x18
> 29 :0x18                                                        29 :0x18
> 30 :0x10                                                        30 :0x10
> 31 :0x2b                                                        31 :0x2b
> 32 :0xb9                                                        32 :0xb9
> 33 :0x55                                                        33 :0x55
> 34 :0x12                                                        34 :0x12
> 35 :0x50                                                        35 :0x50
> 36 :0x11                                                        36 :0x11
> 37 :0x05                                                        37 :0x05
> 38 :0x00                                                        38 :0x00
> 39 :0xc4                                                        39 :0xc4
> 40 :0x02                                                        40 :0x02
> 41 :0x60                                                        41 :0x60
> 42 :0x08                                                      | 42 :0x09
> 43 :0x01                                                      | 43 :0x34
> 44 :0x78                                                      | 44 :0x0b
> 45 :0x00                                                      | 45 :0x6e
> 46 :0x38                                                      | 46 :0x70
> 47 :0x0a                                                        47 :0x0a
> 48 :0x04                                                        48 :0x04
> 49 :0x02                                                        49 :0x02
> 50 :0x68                                                        50 :0x68
> 51 :0x56                                                      | 51 :0x18
> 52 :0x2e                                                      | 52 :0x04
> 53 :0x10                                                        53 :0x10
> 54 :0x18                                                        54 :0x18
> 55 :0x7b                                                      | 55 :0x2d
> 56 :0x08                                                        56 :0x08
> 57 :0x10                                                        57 :0x10
> 58 :0x08                                                        58 :0x08
> 59 :0x02                                                        59 :0x02
> 60 :0x3f                                                      | 60 :0x3e
> 61 :0x6f                                                      | 61 :0x5f
> 62 :0x00                                                        62 :0x00
> 63 :0x00                                                        63 :0x00
> 64 :0x01                                                        64 :0x01
> 65 :0x03                                                        65 :0x03
> 66 :0x00                                                        66 :0x00
> 67 :0x00                                                        67 :0x00
> 68 :0x00                                                        68 :0x00
> 69 :0x00                                                        69 :0x00
> 70 :0x46                                                        70 :0x46
> 71 :0x00                                                        71 :0x00
> 72 :0x00                                                        72 :0x00
> 73 :0x00                                                        73 :0x00
> 74 :0xd4                                                        74 :0xd4
> 75 :0xff                                                        75 :0xff
> 76 :0x19                                                        76 :0x19
> 77 :0x05                                                        77 :0x05
> 78 :0x08                                                        78 :0x08
> 79 :0x00                                                        79 :0x00
> 80 :0x00                                                        80 :0x00
> 81 :0x05                                                        81 :0x05
> 82 :0x14                                                        82 :0x14
> 83 :0x50                                                        83 :0x50
> 84 :0xc0                                                        84 :0xc0
> 85 :0x10                                                        85 :0x10
> 86 :0x74                                                      | 86 :0xcf
> 87 :0x04                                                      | 87 :0x00
> 88 :0x00                                                        88 :0x00
> 89 :0x00                                                        89 :0x00
> 90 :0x00                                                        90 :0x00
> 91 :0x00                                                        91 :0x00
> 92 :0x00                                                        92 :0x00
> 93 :0x00                                                        93 :0x00
> 94 :0x00                                                        94 :0x00
> 95 :0x00                                                        95 :0x00
> 
> rf                                                              rf
> 0 :0x00000000                                                   0 :0x00000000
> 1 :0x00022010                                                   1 :0x00022010
> 2 :0x000008a6                                                   2 :0x000008a6
> 3 :0x00063711                                                 | 3 :0x00062d11
> 4 :0x00000e07                                                   4 :0x00000e07

-- 
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
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