On Thu, 01 Oct 2009 11:28 +0200, Sebastian Heutling wrote : > Hi Konrad,
> On 10/01/2009 10:33 AM, Konrad Mattheis wrote:
> > Hi Sebastian,
> > yes I'm using an AT91SAM9G20-EK Rev.c with two SD slots.
> > I used slot a but I think you just have to init slot b.
> > in PatchV3 you can read:
> >> at91_mci0_hw_init(int slot, int bus_width)
> >> switch (slot) {
> >> case 0:
> >> .....
> >> case 1:
> > So I think you just have to call at91_mci0_hw_init(1,4) for
> > slot b.
> No - that is not enough. It just enables the clock for MCI and
> configures the pins. But the MCI itself needs to know which slot to
> address.
> Suppose you want to use both slots at the same time (and the drivers
> would support that).
> Then you would call:
> at91_mci0_hw_init(0, 4)
> at91_mci0_hw_init(1, 4)
> In order to access both slots the driver (atmel_mci) needs to select
> which slot to address. And that is what the SDCSEL field of MCI-SDCR is
> for (see also Datasheet of the AT91SAM9G20 35.9.4 (probably at page 607)).
But the driver doesn't support for the moment. I might add such support if I
have some time (and if that works - has anybody ever tried doing that with
Linux?). For now the best way to get it working is to select the correct slot
in your board config code.
Cheers,
--
Albin Tonnerre, Free Electrons
Kernel, drivers and embedded Linux development,
consulting, training and support.
http://free-electrons.com
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