El 22/01/2010 18:52, Pavel Roskin escribió:
> On Fri, 2010-01-22 at 10:58 +0100, Khashayar Naderehvandi wrote:
>
>>> I can confirm that 0xdeadbeef comes from the chip, not from some random
>>> place in memory. Even the supported Ubiquiti SR71-15 returns 0xdeadbeef
>>> when reading from the register 0x00ac (AR_IMR_S2).
>>>
>>> The fact that SR71-12 only works if installed in a slot below SR71-15 is
>>> very intriguing. I checked the modules with nm for possible static
>>> variables, but I cannot spot anything wrong. I'm going to try
>>> mmiotrace.
>>>
>> Pavel, this is way too technical for me to understand :)
>
> Sorry, it was meant for Luis.
>
> Ubiquiti SR71-15 is the only AR9220 card I know that works with ath9k.
> It's a 5GHz-only card, so maybe that's the reason.
>
> Ubiquiti SR71-12 is a 2GHz card and it doesn't work. However, if
> SR71-15 is present in the same system and has a lower PCI address so
> that it's initialized first, SR71-12 would work. This makes me think
> that the initialization of SR71-15 changes something in the state of the
> driver. The state should be separate for every device, so it may be a
> bug.
>
> I discovered that reading from some registers gives 0xdeadbeef. Even
> for SR71-15 reading from one register gives 0xdeadbeef. 0xdeadbeef is a
> number commonly used to indicate uninitialized data. But it comes from
> the device. So we are doing something wrong. Maybe the register in
> question (AR_IMR_S2) should be initialized, or maybe the whole chip
> initialization is wrong.
Hi Pavel, i had done some tests and did found that my SR71-12 does
works if I
change in hw.c::ath9k_hw_init_11a_eeprom_fix()...
if ((ah->hw_version.devid == AR9280_DEVID_PCI) &&
test_bit(ATH9K_MODE_11A, ah->caps.wireless_modes)) {
to...
if (ah->hw_version.devid == AR9280_DEVID_PCI) {
Unfortunately, I don't know what that 'fix' fixes :-)
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