topic Re: can not boot from emmc in i.MX Processors

can not boot from emmc

jiejia — Thu, 23 Apr 2015 07:55:51 GMT

I download image to my custom board similar to the I.MX6Q Sabresd using mfgtool. One board can boot successfully. Another board failed to execute the uboot, but I sure all the image had be downloaded by mfgtool. However, it always detect the HID-compliant device in mfgtool after reset my board. I download my uboot.bin to ddr, and enter the uboot command line. I change the uboot command line parameters to make it boot from emmc, and it can enter rootfs successfully. By the way, Boot Select Table is the same as another board. I can detect the pulse of SD4_CMD from the oscilloscope.

Have I missed anything?

Re: can not boot from emmc

igorpadykov — Thu, 23 Apr 2015 08:12:29 GMT

Hi jie

one can try to change eMMC pad settings, such as drive strength

or BOOT_CFG2[2]=1 Apply value per fuse field MMC_DLL_DLY[6:0]

find best value experimentally. Please check Table 8-15 IMX6DQRM

Best regards

igor

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