boot arm64 guest stuck

hello community, I am stuck at a problem where a virtual machine stuck at "guest has not initialized the display" on a arm64 (FT2000+) server and the relevant qemu process will continue to have a cpu usage of 100%. I do try with different qemu and qemu-efi combined and found out that if I use qemu build qemu-system-arm/now 1:2.11+dfsg-1ubuntu7.15~cloud1 arm64 with qemu-efi/now 0~20160408.ffea0a2c-2 all and set gic-version to 2, the vm could boot. the virtual machine uses a kylink 4.0 image. I am scrubbing my head to debug the bug and find out the reason... any idea or advice will be appreciated. thank you very much for the help -- Best Regards, Jiatong Shen