eMMC5.0 Boot with Bus Width=8bit access for i.MX6

[rahulsoni]

Hi All,

We have one custom i.MX6S board which we are booting using eMMC.

I can see no difference in booting time when I set boot_cfg2[7:5] = 000 (1 bit) and boot_cfg2[7:5] = 010 (8 bit).

Can anyone please explain why this is happening. Ideally, when selecting 1-bit eMMC, booting time should be more than 8-bit booting time.

[igorpadykov]

Hi Rahul

emmc has internal non-volatile configuration register for bus width :

EXT_CSD [177] BOOT_BUS_WIDTH, which also should be programmed appropriately.

Best regards
igor
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