SD communication protocol

Xiangfu Liu xiangfu at
Mon Jun 7 23:36:13 EDT 2010


in office kernel image, the "SDIO UART/GPS class support" is not buildin. so
are you use the office image?

On Tue, Jun 8, 2010 at 4:33 AM, Camilo Andres Diaz Botia
<cadiazb at>wrote:

> Hi there,
> I've been working on the SD communication protocol and I managed to
> initialize a fpga as a SDIO card. Ben nano-note says "mmc0: new SDIO card at
> address 0001". However when it tries to enable the first function the cmd53
> with argument 9e000008 fails. I'm telling the Nano I want to use the SDIO as
> a UART, so the register at address x100 is set as "function supports the
> SDIO Standard UART". What I want to do is to use the sdio_uart.c to send and
> receive characters. Any suggestion?
> Thanks,
> Camilo
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