at the end,after several months of research,we (me and @rreddy78) have been able to boot Android by Antmicro :
it boots even if a cyclic error happens :
the real problem now is that it is unabled to grab the connection to the net :
this is the configuration of qemu which works (except for the net)
tunctl -t tap0
ifconfig tap0 up
brctl addif virbr0 tap0
qemu-system-aarch64
-enable-kvm
-smp 4
-m 2048
-cpu host
-M virt
-device virtio-gpu-pci,xres=1024,yres=768
-display sdl,gl=on
-device usb-ehci
-device usb-kbd
-device virtio-tablet-pci
-usb
-serial stdio
-kernel Image
-initrd ramdisk.img
-drive index=0,if=none,id=system,file=system-rw.img
-device virtio-blk-pci,drive=system
-drive index=1,if=none,id=vendor,file=vendor-rw.img
-device virtio-blk-pci,drive=vendor
-drive index=2,if=none,id=userdata,file=userdata.img
-device virtio-blk-pci,drive=userdata
-device virtio-net-device,netdev=mynet
-netdev tap,id=mynet,ifname=tap0,script=no,downscript=no,vhost=on
-append “console=ttyAMA0,38400 drm.debug=0x0 rootwait rootdelay=5 androidboot.hardware=ranchu androidboot.selinux=permissive security=selinux selinux=1 androidboot.qemu.hw.mainkeys=0 androidboot.lcd.density=160”