MMC driver and SDHC cards


cwall

Still Fresh
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Aug 27, 2010
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Durham, Ontario, CA
With talk about updating the Pandora Distribution, just wanted to make the software developers aware of a discussion on the beagle board list with some SDHC cards not working.


http://groups.google.com/group/beagleboard/browse_thread/thread/0083724ff7e54c58#


http://groups.google.com/group/beagleboard/browse_thread/thread/9299329446ffddac#


Some changes to the MMC driver seems to clear up the problem, so that the MMC driver works with the problem SDHC cards.


http://marc.info/?l=linux-omap&m=129481190218659&w=2


Also for those who are interested, here is a link to some testing on a selection of cards, which shows that max transfer speed of a card for camera use, does not mean it is the best when used in normal OS computer applications. The first boot up timing of a new OS when it does its internal configurations with lots of reads and writes, shows this up best in the test result list.


http://www.sakoman.com/OMAP/microsd-card-perfomance-test-results.html


Carl
 
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