IMX28 eMMC flash access

neeveehariharan · ‎11-19-2015

Hi,

We have a custom board developed with eMMC is interfaced with IMX28 ( SSP0 ). Pin mux details are as given below,

static struct pin_desc mmc0_pins_desc[] = {

{ PINID_SSP0_DATA0, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DATA1, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DATA2, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DATA3, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DATA4, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DATA5, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DATA6, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DATA7, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_CMD, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_DETECT, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

{ PINID_SSP0_SCK, PIN_FUN1, PAD_8MA, PAD_3V3, 1 },

};

When we try to access emmc from uboot using mmcinfo command, we are getting the following error.

MX28 U-Boot > mmcinfo

Card did not respond to voltage select!

MMC card init failed!

MX28 U-Boot > mmc rescan 0

Card did not respond to voltage select!

MX28 U-Boot >

Our environment informations are,

u-boot-2009.08 from IMX28 Ltib.

Please share your inputs whether eMMC is supported in the same and patch to make access eMMC flash using IMX28 SSP0.

Thanks,

Hariharan.V.

igorpadykov · ‎11-20-2015

Hi Hariharan

just for reference one can look at attached ltib uboot document for i.MX28 EVK.

One can check card detect signal SSP0_DETECT, also it may be useful to

set detection forced to the kernel, this is described in

sect.14.2.4 Setting Up Card Detection i.MX53 System Development User’s Guide (rev.1, 3/2011)

Best regards

igor

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