chainload u-boot on a not supported android board

Hi all!

I wish to use u-boot as a second stage bootloader on my android phone to prevent stock bootloader affecting linux device tree.

Given stock bootloader initialize UART(it is in cpu address space and I can see output from stock bootloader), RAM and clocks, when I create a port with simple dts(with no clocks, no pinctl), describing only UART(it's in cpu address space), and put it on android boot image together with kernel and initramfs then will I get u-boot uart output? will I be able to load kernel from android boot image?