Driver complaint to SD Host Controller Specification 3.0

Sebastian Huber sebastian.huber at
Fri May 27 05:50:31 UTC 2016

On 26/05/16 16:06, Mudit Jain wrote:
> Hi Sebastian & Andre,
> In the last IRC meeting, Gedare had mentioned that you have previously 
> worked on the SD card driver.
> I was working on the SD Card driver for Rpi.
> I was going through the driver code that has been ported. I was able 
> to browse and get a top level overview regarding the ported driver 
> using the documentation for the APIs used from FreeBSD.
> The driver is working for the powerpc/qoriq BSP.

The SDHC modules for the early QorIQ had many silicon bugs. It never 
really worked well or the variant we used.

> I wanted to know which SDHC is present on that BSP and to which 
> specification was the driver tailored to?
> RPi has a SD host controller that is complaint to Specification 3.0. 
> Thus I was following this link :
> Andre, were the previous commits regarding the reset logic done based 
> on this specification ? I wanted to clarify that that function logics 
> that are to be implemented will be based on this specification ?
> Thanks
> Mudit

FreeBSD claims to have full support for the RPi 2:

So, I would use the latest code from FreeBSD and import it into libbsd.

Sebastian Huber, embedded brains GmbH

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