SD card driver for Freescale i.MX6 in Genode

[Praveen B]

Hi Norman

On Fri, Mar 20, 2015 at 4:10 PM, Norman Feske <norman.feske at ...1...>
wrote:

> Hello Praveen,
>
> > We have developed a Genode device driver for USDHC card reader for
> > Freescale i.MX6 procesor.
> >
> > You may find the corresponding code in the repository,
> > https://github.com/srinivasprv/genode
> >
> > The specific driver code is available in usdhc directory of sd_card
> > directory.
>
> thank you for sharing your work with us! Your patch looks very nice.
>

Thank you.

> Coincidentally, we just added an SD-card driver for the i.MX53 platform
> last week. See the following commit referenced at the following issue:
>
>   https://github.com/genodelabs/genode/issues/1458
>
> Whereas the i.MX53 driver addresses the so-called ESDHC controller, your
> patch addresses the USDHC controller. Are both drivers complementary?
>

As Martin replied, there were some new register definitions in USDHC and
some common registers differ.
For example, the lower 16 bit-fields of CMD register(called  XFER_TYPE in
ESDHC), are defined in Mixer_Control register for USDHC.

Also USDHC returns CSD register shifted by 8 bits. That has to be handled
in read_csd() function of the controller code.

Regards
Praveen Srinivas
IIT Madras


> On another note, the mainline Genode version does not officially support
> i.MX6 yet. So I am afraid that including your driver without prior
> enabling i.MX6 would not be very sensible. As a precondition, we should
> enable at least one i.MX6-based platform (e.g., Wandboard?). Otherwise,
> we would not able to add your driver to our regular test infrastructure.
> What do you think about how to go about it?
>
> Best regards
> Norman
>
> --
> Dr.-Ing. Norman Feske
> Genode Labs
>
> http://www.genode-labs.com · http://genode.org
>
> Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
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>
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