User:Zulu Foxtrott/GentooOnARM/EasyInstall/Bootloader

Installing the sources

On PINE64's ROCKPro64 Das U-Boot (the Universal Boot Loader) can perform both, initialize the hardware and boot a Linux kernel. To be able to do so it depends on Trusted Firmware A.

Trusted Firmware A

Downloading the sources

root #cd /mnt/gentoo/usr/src

Unpacking the sources

root #mkdir /mnt/gentoo/usr/src/trusted-firmware-a

root #tar xvpf -C /mnt/gentoo/usr/src/trusted-firmware-a

U-Boot

Downloading the sources

root #cd /mnt/gentoo/usr/src

Unpacking the sources

root #mkdir /mnt/gentoo/usr/src/uboot

root #tar xvpf -C /mnt/gentoo/usr/src/uboot

Building Trusted Firmware A

root #cd /mnt/gentoo/usr/src/trusted-firmware-a

root #make PLAT=rk3399

Building U-Boot

root #cd /mnt/gentoo/usr/src/uboot

root #export BL31="/mnt/gentoo/usr/src/trusted-firmware-a/build/rk3399/release/bl31/bl31.elf"

Configuring U-Boot

root #make rockpro64-rk3399_defconfig

Optional: Tuning U-Boot manually

root #make menuconfig

Compiling U-Boot

root #make

Installing

root #dd if=/mnt/gentoo/usr/src/uboot/idbloader.img of=/dev/mmcblk0p1

root #dd if=/mnt/gentoo/usr/src/uboot/u-boot.itb of=/dev/mmcblk0p2

Configuring extlinux

root #mkdir /mnt/gentoo/boot/extlinux

root #nano -w /mnt/gentoo/boot/extlinux/extlinux.conf

TODO: dtb installed before?; document change of blkdev handle; add initrd example

FILE /mnt/gentoo/boot/extlinux/extlinux.confA extlinux.conf example

label kernel-5.10
    kernel /Image
    fdt /rk3399-rockpro64.dtb
    append earlyprintk root=/dev/mmcblk1p4 rootwait rootfstype=btrfs init=/sbin/init

Next

Booting the target device