Re: MX27 libertas_sdio SDIO Interrupts vs available bitrate

[Andreas Feuersinger <andreas.feuersinger@spintower.eu>]

Hi Julien!

Julien Boibessot <julien.boibessot@free.fr> wrote:
> Andreas Feuersinger a écrit :
> > Everything works except for very bad datarate. So far the mxc_mmc
> > driver does not handle any SDIO interrupts. Could that be the reason
> > for the bad performance? 
> >   
> Definitly !
> (I had the same "problem" on my i.MX27 platform before using SDIO
> interrupts)

thank you! At least I know where to go ;)

While trying to enable SDIO handling I look at the mainline kernel
patch for SDIO interrupts in mxcmmc.c.

But in order to apply that I have to port that driver, introduced in
2.6.29 to my 2.6.22 kernel version. 

In the first step I try to get it run without sdio support.
The driver seems to load helper firmware successfully and also real
firmware. After that it stops where the libertas driver says:
"waiting for firmware to boot."

Register status is as follows:
mxcmci_irq:status: <6>BUF_WRITE_RDY |<6>END_CMD_RESP |<6>BUF_UND_RUN
|<6>XBUF_EMPTY |<6>YBUF_EMPTY |<6>

Looks like stopped clock? Is the firmware supposed to start some cmd?


I have a different question:
Does anybody know if it is possible to boot freescale development board
mx27pdk  using kernel versions greater 2.6.30 ?

thanks

Andreas