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IMX6ULL: U-boot detects mmc during mfgtool download, but not from eMMC

Question asked by Ali Ismail on Aug 17, 2018
Latest reply on Aug 19, 2018 by igorpadykov

I have a custom IMX6ULL board. I am using the following u-boot and linux kernel:

LINUX_BRANCH = "4.1-2.0.x-imx"


UBOOT_BRANCH = "imx_v2016.03_4.1.15_2.0.0_ga"

UBOOT_REPO = "git://"

UBOOT_CONFIG = 'mx6ull_14x14_evk_defconfig'


Issue: Using mfgtool, I can download successfully a u-boot, kernel, and rootfs directly to an eMMC connected to usdhc1. When I switch to internal boot mode and boot from the eMMC, u-boot does not detect the MMC. I am confused why the mfgtool u-boot detects the mmc, however, the production u-boot does not.


Attempts to solve:

1. Completed DDR stress tests and added calibration values to u-boot

2. Modified the pins for usdhc1 to match schematic (this is likely correct since mfgtool uboot works properly)

3. Modified the uboot environment to point to mmc0, mmcblk0p1 (partition contains linux kernel and dtb), modified mmc load image partition to 1 to match mmcblk0p1


Any ideas on what could be different between running the mfgtool and booting from the emmc?