[uClinux-dev] 5282 and 2GB SD cards

[NZG]

The block size should be detectable during initial configuration as per the 
original SD/MMC standard.
If they don't follow that standard....well there really not SD cards then and 
probably not worth supporting until they fix it.

NZG

On Sunday 18 February 2007 8:53 pm, Bob Furber wrote:
> Hi Wolfgang,
>
> > please note that ALL SD cards have 512 bytes blocksize. All I/O is in
> > 512 Byte blocks.
> >
> > The blocksize of 1KByte which is reported for 2GB cards is ONLY to
> > compute the capacity of the card.
>
> Good stuff!
>
> Does this mean that if the csd.c_size read from the card should be doubled
> on 2GB cards? Then the 2GB card can be treated by the software exactly as
> if it were a 1GB card, but, with twice as many blocks?
>
> While on the subject, would you know how 4GB cards can be accessed? The
> little information that I have found indicates that the SDHC (High
> Capacity) has not yet caught on and that large SD cards do not follow a
> clear standard.
>
> Thanks,
>
> Bob Furber
>
>
>
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