coreboot

I have built a u-boot elf image and successfully booted this with coreboot_opensbi w/u-boot payload.

I am trying the same with the Linux kernel.

NOTE: Riscv does not have a bzip2 option for the kernel image.

I have tried several options:
Image
Image.gz
vmlinux
(The only one that is elf is vmlinux)

All three build but fail to launch. Below is Image file output
Checking segment from ROM address 0x00000000800304b8
SELF segment doesn't target RAM: 0x0000000000090000, 4224 bytes

Wondering if anyone has done this and what options for kernel/coreboot are used to do it?