Building U-Boot Print

 

Installing U-Boot to the NXP i.MX RT1050 EVK Board explains how to install the U-Boot firmware to the board for the first time. Having installed U-Boot, U-Boot is immediately available on the I.MX RT1050 board as a primary firmware monitor.

The default U-Boot configuration is a capable Linux bootloader so typically our customers do not require re-building and re-installing U-Boot. However, certain projects still do require customizations to the U-Boot firmware, which implies making changes to the U-Boot code, rebuilding the U-Boot binary and then updating it on the RT1050 board.

Building U-Boot

The full U-Boot source for the NXP i.MX RT1050 EVK board is included in the software distribution available from the Emcraft web site. Refer to the u-boot/ sub-directory in the software distribution tree.

The key board specific-configuration files for the NXP i.MX RT1050 EVK board are as follows:

  • u-boot/configs/imxrt1050-evk-sdcard_defconfig - default U-Boot configuration;
  • u-boot/include/configs/imxrt1050-evk.h - configuration options;
  • u-boot/board/freescale/imxrt1050-evk/imxrt1050-evk.c - board-specific initialization code.

Step through the following procedure to build U-Boot for the NXP i.MX RT1050 EVK board:

  1. On the Linux development host, activate the cross-build environment as described in Installing and Activating Cross Development Environment:

    2. $ . ./ACTIVATE.sh

  2. Change to the U-Boot top directory:

    3. $ cd u-boot

  3. Configure U-Boot for the NXP i.MX RT1050 EVK board:

    4. $ make mrproper
    $ make imxrt1050-evk-sdcard_defconfig

  4. Run make to create the U-Boot binaries (SPL and u-boot.img):

    5. $ make -s