MuRata WiFi Module with Marvell 88w8686

[claud_yu]

--- 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.


> 
> 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.

> 
> 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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