§2023-08-26

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以下　is going no where

1. install u-boot

(chroot) hc4Gentoo # emerge --sync
# emerge --search u-boot
 Results for search key : u-boot ]
Searching...

*  dev-embedded/u-boot-tools
      Latest version available: 2023.01
      Latest version installed: [ Not Installed ]
      Size of files: 18126 KiB
      Homepage:      https://www.denx.de/wiki/U-Boot/WebHome
      Description:   utilities for working with Das U-Boot
      License:       GPL-2

[ Applications found : 1 ]

# emerge dev-embedded/u-boot-tools
...
/usr/bin/bmp_logo
   /usr/bin/dumpimage
   /usr/bin/fdtgrep
   /usr/bin/gen_eth_addr
   /usr/bin/img2srec
   /usr/bin/mkenvimage
   /usr/bin/mkimage
   /usr/bin/fw_printenv

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• After I did install u-boot-tools how to use it on odrod-hc4 machine?

fw_printenv To set a U-Boot environment variable:

bash Copy code fw_setenv variable_name value Creating U-Boot Images: U-Boot images are binary files that contain the U-Boot bootloader and optionally other components like device tree blobs. You can use the mkimage command provided by the u-boot-tools package to create U-Boot images. For example, to create a U-Boot image with a specific device tree blob:

bash Copy code mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n "My Boot Script" -d boot.txt boot.scr In this example, boot.txt is a text file containing U-Boot commands that you want to execute during boot.

Customizing U-Boot Environment Scripts: U-Boot environment scripts are often used to automate tasks during boot. You can create a script with U-Boot commands and use the mkimage command to convert it into a U-Boot environment script image (usually with .scr extension).

Create a text file (e.g., boot.txt) with U-Boot commands.

Convert the script to a U-Boot environment image:

bash Copy code mkimage -A arm -O linux -T script -C none -a 0 -e 0 -n "My Boot Script" -d boot.txt boot.scr Place the generated boot.scr file on your boot media.

These are just a few examples of how you can use the u-boot-tools package. For more advanced tasks and details, refer to the U-Boot documentation and guides specific to your Odroid HC4 machine. Additionally, if you're working on a customized U-Boot setup, refer to the U-Boot documentation for the appropriate commands and procedures.

Remember that the specific steps might vary based on your system's configuration, U-Boot version, and the specific tasks you want to achieve. Always consult the relevant documentation and resources for accurate and up-to-date information.

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