MuRata WiFi Module with Marvell 88w8686

[Tim Harvey]

Dan Williams wrote:
> On Tue, 2008-05-20 at 13:48 +0800, claud_yu wrote:
>   
>> --- 08/5/16 (星期五)，Tim Harvey <tharvey at irobot.com> 寫道：
>>
>>     
>>> 寄件者: Tim Harvey <tharvey at irobot.com>
>>> 主旨: RE: MuRata WiFi Module with Marvell 88w8686
>>> 收件者: claud_yu at yahoo.com.tw
>>> 副本: libertas-dev at lists.infradead.org
>>> 日期: 2008 5 16 星期五 上午 2:59
>>> Claud,
>>>
>>> Thanks for your work here!  I've successfully gotten a
>>> Zcomax XG-182M
>>> (http://www.zcomax.com/embedded.htm#XG-182M) module based
>>> on the 88W8686
>>> working on an i.MX31 platform using the 8.73.7p3 fw using
>>> your patches.
>>> I still have a couple of questions.
>>>
>>> When I bring up the driver, I see some commands fail:
>>>
>>> libertas_sdio: Libertas SDIO driver
>>> libertas_sdio: Copyright Pierre Ossman
>>> HOTPLUG: firmware add
>>> /usr/lib/hotplug/firmware/sd8686_helper.bin
>>> HOTPLUG: firmware add /usr/lib/hotplug/firmware/sd8686.bin
>>> libertas: 00:19:70:02:12:3c, fw 8.73.7p3, cap 0x00000303
>>> libertas: PREP_CMD: command 0x00a3 failed: 2
>>> libertas: PREP_CMD: command 0x00a3 failed: 2
>>> libertas: eth1: Marvell WLAN 802.11 adapter
>>>       
>> I never send 0xa3 command to 88w8686 in my current driver . And I can't find any document about command 0xa3. The 0xa3 command (CMD_MESH_CONFIG) exist after 2.6.25 kernel. I didn't try to back port 2.6.25 to 2.6.22. The code I used is from main stream 2.6.24.
>>     
>
> Anything "mesh" is OLPC firmware specific and thus won't be applicable
> to any other chip besides the 8388 or firmware version.  If other chips
> freak out when they get sent invalid commands, we need to whitelist the
> 8388 or something.  But I doubt that sending the initial mesh check
> would be causing these issues; the firmware is (hopefully) robust enough
> to just return an error.
>   
So the OLPC 'software' is linux and uses the libertas driver?  I saw 
that there is an effort to build GPL firmware for the 8388 but currently 
the firmware is not GPL correct?

The 'PREP_CMD: command 0x00a3 failed' doesn't cause an issue... I was 
just surprised to see it

>   
>>> The 0x00a3 cmd is CMD_MESH_CONFIG - I assume this is for
>>> the 802.11s
>>> like MESH that Cozybits added.  Am I correct in that this
>>> support only
>>> exists in the USB firmware and thats why I see the errors
>>> when using an
>>> SDIO module?
>>>       
>> You maybe right. That should depend on the firmware. I don't know that either.
>>     
>
> Yes; but again I don't think it should affect the operation of any other
> firmware version to just check once.  We should only be checking for
> mesh once and then we should never be calling another mesh-related
> command.
>
> Dan
>
>   
>>> Regarding the patch you had to make to the Freescale MMC
>>> driver
>>> (drivers/mmc/core/mxc_mmc.c) to disable 4-bit SDIO mode -
>>> are you
>>> thinking that there is a bug with Freescales SDHC or is
>>> there some issue
>>> with the 88W8686 and/or the firmware here?  My
>>> understanding is that the
>>> 8686 should support 1-bit SDIO, 4-bit SDIO, and SPI - am I
>>> wrong about
>>> this?
>>>       
>> I don't know who is bad guy. But I know another 88W8686 module maker use the same configuration to make iMX31 and 88w8686 work together. 
>> And their report show 4 bit mode have the same CRC error like my first implementation.
>>
>>
>>     
>>> Regarding the patch you had to make to libertas
>>> (drivers/net/wireless/libertas/if_sdio.c) to force the io
>>> chunk size to
>>> be a multiple of the MX31 SDHC's block size - are you
>>> thinking that this
>>> is a bug/limitation of the MX31 SDHC?
>>>       
>> That depend some HW issue. Basically I want use DMA all the time.
>> And DMA have more constraint the PIO ( address and size alignment). 
>> That will be basic trade-off. 
>>
>> Claud Yu
>>
>>
>>
>>
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>>     
>
>