Raspberry Pi 4 bcm2711 (aarch64)

I don't know whether many people want or not, but I was contacted about installing slarm64 on this device.

After reading the data on the operation of this device, I realized that this device can be added to the image assembly (images_build_kit) system for devices.
While this is not in the main branch, I would like to test for transfer to the general branch, but I do not have this device. so please test the system boot.

I decided to use u-boot as a kernel loading layer, let's see what happens.

compiled the kernel 5.6.10
slarm64-current-aarch64-base-rootfs-20200513-5.6.10-raspberry_pi_4-build-20200517.img.xz
slarm64-current-aarch64-base-rootfs-20200513-5.6.10-raspberry_pi_4-build-20200517.img.xz.md5

if the download fails, try changing the kernel=u-boot.bin parameter to kernel=Image in /boot/config.txt

I also want to mention akschu which already described the assembly process.