U boot raspberry pi4/20/2023 # mkimage -A arm64 -O linux -T script -C none -d boot.txt īy the way, just as with the kernel, the U-Boot bootloader can also be easily generated as a 64-bit version. # make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 \ Upon completion of all of these preparations, you will have a fully functional system after unmounting both of the partitions again. The script gets a U-Boot header with the help of the Mkimage program from the u-boot-utils package ( Listing 4). Listing 3 shows the U-Boot script, boot.txt. However, the new names for the kernel and device tree will definitely require that U-Boot's bootloader configuration be modified. The professional approach to installation involves copying the kernel under its own name to the microSD card, using the correct device tree, and most importantly, locating the kernel module on the root partition. ![]() Once the power is turned on, the computer should boot the self-generated kernel. Therefore you should unmount the card right after copying the kernel and insert it into the Rasp Pi. The device tree that is also found on the SD card is suitable for the first test. If you want to make absolutely sure, you should save the 64-bit kernel with the same name that is on the SD card before you overwrite it with your own kernel. The U-Boot script found on the boot partition will be waiting there under that name, thus saving the need for any modification to the configuration. Impatient users can simply copy the self-compiled kernel arch/arm64/boot/Image to the boot partition ( Figure 4). ![]() There are two possibilities for installing your own kernel: a method for impatient users and the professional method. Then you can unmount the boot and root partitions again. The cp command only copies the kernel you have compiled yourself to the boot partition as an Image file. Figure 4: Here, Ubuntu has mounted the microSD card.
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