On Tue, Aug 19, 2014 at 3:48 PM, Álvaro Fernández Rojas <nolt...@gmail.com> wrote:
> El 19/08/2014 21:43, jonsm...@gmail.com escribió: > > How is the clock speed wrong? > > The lowest speed the RT5350 SPI controller can achieve is System Clock / > 128. > System Clock = 120MHz > Lowest SPI Clock = 120MHz / 128 = 937.5KHz > > However, the MMC/SD cards need to be initialized at 100-400KHz. > This might work... Put the SPI pins into GPIO mode. Use the kernel bit-bang support for SPI to initialize the card. Then go back to high speed mode. -- Jon Smirl jonsm...@gmail.com
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