Re: Re: 答复: SDHC driver of RTEMS

[芮正新]

Thanks for your reply.
Can you give me some advices to resolve my problems?

Thanks & Best regards,
Rui Zhengxin

> On 2013-08-05 04:02, 芮正新 wrote:
> > Hi Ric,
> >    Do you found such problems on your driver?
> >    The u-boot has the "fatload" command, I can use it to load RTEMS
> image(about 4MB size) from SD card, and it's has no error.
> >    I know the u-boot use poll method, but it should not be the reason.
> 
> At least the eSDHC controller on the P1020 had some silicon bugs which
> needed workarounds for the DMA mode.
> 
> At the time I wrote the QorIQ BSP the chip was relatively new and not all
> bugs were in the errata document, but the Linux driver was a good
> documentation source.  I tried to use the SDHC framework from FreeBSD,
> but it didn't fit well with the silicon bugs, so in the end we used a custom
> driver not committed to the main RTEMS sources.
> 
> After the network stack update we have enough FreeBSD compatibility to
> easily use the SDHC framework.  So in the future this might be an option.
> 
> --
> Sebastian Huber, embedded brains GmbH
> 
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-brains.de
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> 
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