The utility can be installed as a package on Debian-based Linux hosts, or the utility path can be added to the $PATH variable to be invoked during the Linux kernel build process.Īppending the utility location to the $PATH variable will also make it available for builds that require it. You could probably use a two steps approach, this would avoid using emmc specific code in your u-boot custom command: loading the file into memory, use a custom u-boot command for reading it from memory. This includes Linux kernel, ramdisk and FIT images that are to be loaded by U-Boot. mkimage is used to build images that can be used with U-Boot. The mkimage utility is built along with the U-Boot executable. Start of section headers: 3394048 (bytes into file)įlags: 0x5000200, Version5 EABI, soft-float ABIĬopy the U-Boot binary to the directory that will be used to build the boot image $ cp u-boot /home/boot/u-boot.elf Start of program headers: 52 (bytes into file) The compiled executable binary (u-boot) is an ELF file, however it will not have the. The bootargs variable is set in the uEnv.txt file located in the FAT boot partition of the standard snickerdoodle SD card image.īootargs=console=ttyPS0,115200 root=/dev/mmcblk0p2 rw rootwait earlyprinkīuild U-Boot Get Source $ git clone Configure with Base Configuration $ make ARCH=arm snickerdoodle_defconfig $ make ARCH=arm CROSS_COMPILE=arm-none-eabi. The bootargs U-Boot environment variable (if it exists) is passed to the kernel as boot arguments and will override the bootargs property of the chosen node in the device tree. The root parameter of the boot arguments should be set to the device file for the root filesystem disk partition. The root filesystem disk partition will need to be specified by the boot arguments passed to the kernel. (continued) Command Description mm Modifies the contents of some memory. A boot script can, and should, utilize the environment variables to determine filenames, memory addresses and boot mode. The default environment in the U-Boot source by defining the CONFIG_EXTRA_ENV_SETTINGS in the board configuration header file.Ī text file that utilizes the scripting capabilities of U-Boot can be wrapped with a U-Boot header and used to load and boot system components. Normally, U-Boot is configured to utilize the run-time configured environmental variable $modeboot. U-Boot will load the default environment contained The scripted commands associated assigned to the $modeboot variables can be customized and saved to the environment region of the flash memory. The boot modes of interest for snickerdoodle are SD card and QSPI flash. The list of available devices can be shown via mmc list command: > mmc list mmc list EXYNOS DWMMC: 0 (eMMC) EXYNOS DWMMC: 2 (SD) Configuration. Replace u-boot-spl.kwb with u-boot-a38x-mmc.bin in command below if you are using Marvell U-Boot 2013.
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