Alderlake-P DDR4 RVP Graphics issue

Hi folks,
Myself Building image for ADL-P DDR4 RVP, by using coreboot 4.21 &
Mrchromebox EDK-II as a UEFI payload.
By default, RVP don't have a   *"libgfxinit" *support *in coreboot *but
with the help of Mrchromebox i have integrated the *"libgfxinit" support.*

from make menuconfig->> under devices ->> Graphic Initialization ->
libgfxinit
Vbt ->> extracted Vbt file from the Stock BIOS

with the above config, I am able to see the BIOS Menu only on *uart console*
However, on External Monitor (HDMI display) appeared with blank screen (No
backlight) I inspected the debug log and it says "*HW.GFX.EDID.Sanitize:
EDID header pattern mismatch!".*

Debug logs: https://pastebin.com/Y8y78Xv1

kindly please advise the solution for this issue..
Thanks in advance..

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