Alderlake-P DDR4 RVP Graphics Problem

Hi folks,
using coreboot version : 4.21
I have an ADL-P DDR4 RVP and am using the Mrchromebox as a UEFI payload.
*Method 1: *
from the coreboot make menuconfig,
under devices ->> Graphic Initialization -> Gop Driver
Vbt ->> using the extracted Vbt file from the Stock BIOS

with the above config, It boots without problem on the uart console and I
can enter the BIOS menu. However, I cannot get HDMI display output like
backlight & logo. I inspected the debug log and it says "*Graphics hand-off
block not found*"

*Method 2:*
from the coreboot make menuconfig,
under devices ->> Graphic Initialization -> none
Vbt ->> using the extracted Vbt file from the Stock BIOS
under payload->> IntelGopDriver.efi ( Got from the intel team)

with the above config, It boots without problem on the uart console and I
can enter the BIOS menu. However, I cannot get HDMI display output like
backlight & logo.

what should I do? what's the problem ?
kindly please advise the solution of this issue..
Thanks in advance..

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