With some little amendments on devicetree.cb according to Nico Huber's suggestion and testing on builtin hdmi display port with coreboot+gop+tcore+uefy_payload https://pastebin.com/8hzTdcuL but it still does not trigger the DISPLAY as the tcore+coreboot_payload does with the coreboot bios logo but that sticks there and does not brings up the GRUB menu as in the former one's case though only manageable through serial output and also the USB keyboard works for the former case. So no big change or no break through so far.

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