Sometimes you encoutner thisSD/eMMC issue ,"Card did notrespond to voltage select! ". You could add debug message to see the communication between SD/eMMC and host.
#define DEBUG
#define CONFIG_MMC_TRACE
& add debug message in mmc.c (driver/mmc)
int mmc_send_cmd(struct mmc
*mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
..
printf("CMD_SEND:%d\n",cmd->cmdidx);
printf("\t\tARG\t\t\t0x%08X\n", cmd->cmdarg);
..
}
=> mmcinfo
CMD_SEND:0
ARG
0x00000000
MMC_RSP_NONE
CMD_SEND:8
ARG
0x000001AA
MMC_RSP_R1,5,6,7
0x00000001
CMD_SEND:55
ARG
0x00000000
MMC_RSP_R1,5,6,7 0x00000001
CMD_SEND:0
ARG
0x00000000
MMC_RSP_NONE
