Freescale i.mx25 SDIO/Libertas issue

Fabio Estevam festevam at
Mon May 30 22:03:35 EDT 2011

Hi Daniel,

On Mon, May 30, 2011 at 6:50 AM, Daniel Mack <zonque at> wrote:
> On Mon, May 30, 2011 at 3:52 AM, Andre Renaud <andre at> wrote:
>> Hello,
>> I am trying to use a Wi2Wi 802.11b/g (W2CBW009S) module attached to an
>> i.MX25 cpu, specifically the i.MX25 PDK from freescale, although I've
>> also tried it on a DeviceSolutions Topaz i.MX25. However it is unable to
>> fully load the driver, leaving me with the following in the logs:
>> [   30.149097] libertas_sdio mmc0:0001:1: (unregistered net_device):
>> command 0x00a9 timed out
>> [   30.153759] libertas_sdio mmc0:0001:1: (unregistered net_device):
>> Timeout submitting command 0x00a9
>> [   30.158843] libertas_sdio mmc0:0001:1: (unregistered net_device):
>> PREP_CMD: command 0x00a9 failed: -110
>> [   30.164126] libertas_sdio mmc0:0001:1: (unregistered net_device):
>> CMD_FUNC_INIT cmd failed
>> This wifi chip is based around the Marvell 8688 core.
>> I have also tried using an 8686 device, and in that case it is unable to
>> even complete loading the firmware, failing with the following:
>> [   14.753132] libertas_sdio: Firmware req_size: 17
>> [   14.755713] libertas_sdio: failed to load firmware: -5
>> [   14.759272] libertas_sdio: probe of mmc0:0001:1 failed with error -5
>> Note: I added the 'req_size: ' debugging message in
> I assume this error happens after the driver uploaded the helper
> firmware and switched to multi-block transfers?
> Which kernel version are you working on? I'm asking because I fixed a
> similar bug some months ago which I happend to see an a MX31 CPU with
> a 8686 attach to the SDIO bus. The MX3 MMC controller has bug severe
> bug in its CRC calculation code which causes multi-block transfers on
> a 4-bit bus to fail, and hence the only solution was to switch to a
> 1-bit bus. But I don't known whether this also affects MX25 cores.

The MX25 has a different SD controller (eSDHC) than the one found on
MX31 and such issue is not present.


Fabio Estevam

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