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totally uncompleted implementation of SD/MMC protocol over SPI lines.
code is not finished yet, but commit it so i can hack at home

/*
 * $Id: sdmmc.c,v 1.1 2007/12/20 15:23:15 nbrk Exp $
 */
#include <sys/types.h>
#include <dev/sdmmc/sdmmcvar.h>

struct sdmmc_cmdframe
sdmmc_command(uint8_t cmd, uint32_t arg, uint8_t crc)
{
	/*
	 * Construct command frame and return it.
	 */
	struct sdmmc_cmdframe cmdframe;

	cmdframe.sc_cmd = CMDFRAME_CMD(cmd);
	cmdframe.sc_arg = arg;
	cmdframe.sc_crc = CMDFRAME_CRC(crc);

	return(cmdframe);
}