2009-02-24 07:52:32     SPI_MMC

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2009-02-24 07:52:32     SPI_MMC

David Lee (UNITED STATES)

Message: 69808   

 

Hi all,

 

I wonder if SPI_MMC driver supports both SPI mode and 1-bit mode.

 

Thanks,

 

David

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2009-02-24 10:26:43     Re: SPI_MMC

Mike Frysinger (UNITED STATES)

Message: 69817   

 

i dont understand what you're asking ... there is only 1 data line, so it can only operate in 1 bit mode.  and it's "mmc over spi", so it will always operate in "SPI mode".

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2009-02-25 00:32:27     Re: SPI_MMC

David Lee (UNITED STATES)

Message: 69853   

 

Hi Mike,

 

Thanks. You have answered my question clearly.

 

David

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2009-02-25 00:38:42     Re: SPI_MMC

David Lee (UNITED STATES)

Message: 69855   

 

What I don't quite understand is that why microSD does not work with the driver. I cross checked with information from http://en.wikipedia.org/wiki/MicroSD. It mentions that microSD supports -bit mode. However SPI mode is an optional feature for microSD. How should I understand it?

 

Thanks,

 

David

 

 

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2009-02-25 08:28:26     Re: SPI_MMC

Wolfgang Muees (GERMANY)

Message: 69886   

 

I have NOT found a microSD which does NOT support SPI.

 

I have checked microSD working with the mmc_spi driver (see my posts and patches here).

 

regards

 

Wolfgang

 

 

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2009-02-27 23:34:05     Re: SPI_MMC

David Lee (UNITED STATES)

Message: 70128   

 

Hi Wolfgang,

 

I could not find your patches in the forum. Please can you give me a pointer.

 

Thanks,

 

David

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2009-03-02 00:55:22     Re: SPI_MMC

Yi Li (CHINA)

Message: 70192   

 

David,

 

Have you tried using SVN trunk kernel? Wolfgang's patch is in SVN trunk.

 

-Yi

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