I'm working on a project to bring mainline linux kernels to android phones. I'm planning to use u-boot as a secondary stage bootloader packed in android boot image, so that linux kernel is replaced with u-boot, and initramfs is replaced with FIT image.
This approach allows to use u-boot on a phone without much pain with storage drivers. Obviously, u-boot should know initramfs load address. It can be obtained from initrd-start device tree option. However, on arm64 address to the right device tree is provided in x0 CPU register. Would you accept a patch to preserve boot args on arm64?
