On Tue, Aug 11, 2009 at 08:57:46PM +1000, Microbit_Ubuntu wrote: > I can't really give any specific help other than what you already tried, but > I have been in a similar situation. > I got some Olin 2 GB cards a little while ago and existing firmware I had > running (using SPI) > totally refused to run properly. Like you, I allowed the "hack" on the block > length > in CSD. My good old trusty card reader doesn't like the cards either. > > I spent a bit of time stepping around further in my code but I never pinned > it down > as to where these 2 GB cards went to lala land. I gave up I must say... too > irritating. > A look at the card vendor's URL revealed they expect the consumer to buy > "their" card reader > products, which of course is a joke. > > The last I checked, the consensus is/was that the 2 GB cards arena is a big > mess. Apparently, > more don't work than ones that actually do.... > Seemed to me might as well move to HC... ? > > I certainly appreciate/sympathise - I found it very irritating to say the > least : > These cards are sold with the SD spec logo - but they don't __comply__ !!!
I suspect the card does comply but the reader does not. A number of readers assumed the block size on SD cards was 512 bytes even though the spec never said that it was. most card sizes are, but e 1024 byte blocks. Apparently the spec says that even the 2GB cards must support 512byte reads and writes, but still some card readers/drivers get confused. I suppose it is also possible to have a 2GB card that was made to an older spec before it was clarified that 512byte read/write was required even when the block size was 1024byte. personally I have never had issues with 2GB cards in any device, but all my 2GB cards are relatively new. -- Len Sorensen _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
