Hi, >> But it doesn't work and the driver cann't detect the sd card. Does >> anyone use the s3cmci driver in DMA mode successfully? >> > > I don't think anyone has used it with DMA in a long time (probably no > later than 2.6.14 or even 2.6.10). That's right. And even then DMA did not work reliable. To be honest, it never did. It always lost and/or corrupted data (about 1 in 10000 transfers or so).
I hunted that problem for quite some time and found what I believed to be a race condition in the DMA support layer. At the same time, I noticed that PIO transfers are faster than DMA for small blocks (random access on FAT). So I decided to drop DMA support and go for a solid PIO implementation. Thomas
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