On Mon, 6 Nov 2006, William Chops Westfield wrote:

> The previously mentioned ARM project has had trouble reading "some"
> SD cards smaller than 2G, and is reported not to work with any cards
> larger than 2G (it uses SPI mode exclusively, I believe.)  "serial" mode
> is not entirely the same as SPI mode (apparently.)  According to the
> wiki
> page, SPI mode is "options" on microSD.  YMMV.  Some of this may be mere
> driver bugs.

I would suspect driver bugs.  The SPI protocol supports 32-bit
addressing, so there's no limitation there, but of course if the
memory address is declared as an "int" somewhere instead of an
"unsigned int", you'll hit a 2GB wall.  And of course, a 4GB card
requires FAT32, while a 2GB doesn't.

--
John W. Temples, III
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