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Description

U-Boot is the bootloader for all i.MX6 devices. The bootloader first loads the devicetree, kernel and ramdisk, and then executes the kernel providing it with additional information such as the name of the device holding the root filesystem. U-Boot supports the ext2/3/4 filesystems as well as fat. Since our 2018.01 release, USB, SATA, eMMC and microSD are supported for both reading and writing.

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There are actually three methods for installing the U-Boot binaries:

1. usb mass storage mode: The board presents itself as a usb drive to the host PC

2. DFU: The board listens for the DFU protocol on USB

3. the hard way: load and write files by hand using u-boot commands

We highly recommend using methods 1 or 2 as they are much easier to understand than the third!

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We have developed a transitional boot-script that simulates the old behaviour to allow booting old system images that have not adopted support for distro boot: i.MX6 Legacy Boot-Script

Download and compile:

wget https://gist.github.com/SolidRun/Josuau-SRboot/feb0a32903154fab147c875efac749a7releases/rawdownload/e17300c31e0db6dc259a7568eaec5aa6b8077d09/imx6boot.txt
mkimage -A arm -O linux -T script -C none -a 0 -e 0 -d imx6boot.txt imx6bootv2013.01-imx6-sr-transition/legacyboot.scr

This mkimage’d boot-script should be placed at a well-defined location that u-boot can read from, under a name that does *not* equal boot.scr. We suggest calling it legacyboot.scr. Then the bootcmd environment variable has to be configured to force always running this script unconditionally. Here is a sample for when legacyboot.scr lives on the first partition on microSD:

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CONFIG_SPL_BOOT_DEVICE_SATA=y
CONFIG_SCSI_AHCI=y
CONFIG_SPL_SATA_RAW_U_BOOT_USE_SECTOR=y
CONFIG_SPL_SATA_RAW_U_BOOT_SECTOR=0x8a
CONFIG_ENV_IS_NOWHERE=y

• SPI

CONFIG_SPL_BOOT_DEVICE_SPI_FLASH=y

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