On Tue, 29 Jan 2008 08:35:50 +0100 "Ulf Samuelsson" <[EMAIL PROTECTED]> wrote:
> > Your code does not support DMA transfers, while the current dataflash code > > runs DMA up to 50 Mbps. > > so ? the point of u-boot is to do everything in PIO mode. > > ==> This is not how the dataflash support is implemented in U-Boot today. > Current implementation is using DMA. Current implementation is also AT91-only, which is a design flaw that is much worse than anything in Mike's approach. That said, I think the low-level SPI API should make it possible for a low-level driver to do DMA. The proposed byte-at-a-time API does not allow this, while the existing spi_xfer() interface in include/spi.h does, assuming the buffers are properly aligned. Haavard ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
