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MMC in U-Boot 2015.04 at imx6qSabreSD-based board.

Question asked by Peter Tseng on Mar 31, 2016
Latest reply on Apr 20, 2016 by fulin chen

Hi i.MX Community,


I reference imx6qSabreSD trying to porting my custom board.

I need to support eMMC(SD3) and SD card slot(SD4).

In MCC device add and boot  support  i have added this following one,



static const struct boot_mode board_boot_modes[] = {

  /* 4 bit bus width */

  {"mmc0", MAKE_CFGVAL(0x40, 0x30, 0x00, 0x00)},

  /* 8 bit bus width */

  {"emmc", MAKE_CFGVAL(0x60, 0x58, 0x00, 0x00)},

  {NULL, 0},


#endif /* CONFIG_CMD_BMODE */


static struct fsl_esdhc_cfg usdhc_cfg[2] = {

  {USDHC3_BASE_ADDR}, /* eMMC */

  {USDHC4_BASE_ADDR}, /* SD Card Slot */




But it can not find the MMC device.

the error message follows:


U-Boot 2015.04 (Mar 31 2016 - 15:37:08)



CPU:   Freescale i.MX6Q rev1.2 at 792 MHz

CPU:   Temperature 28 C

Reset cause: POR

I2C:   ready

DRAM:  2 GiB

MMC:   MMC/SD: Reset never completed.

voltage not supported by controller



MMC Device 2 not found

No MMC card found

Using default environment



Display: (1024x600)

In:    serial

Out:   serial

Err:   serial

unsupported boot devices

check_and_clean: reg 0, flag_set 0

Recovery key pressed

Fastboot: Recovery command file found!

Unsupported bootup device for recovery: dev: 9

SATA isn't buildin

Net:   FEC [PRIME]

Normal Boot




Hope for your help!