Can't get qemu to run aarch64/xilinx_zynqmp_lp64_qemu example app

[Jens Schweikhardt]

Hello world,

I've installed an aarch64 toolchain and the xilinx_zynqmp_lp64_qemu BSP
from current sources with waf (on FreeBSD 14).

The docs on https://docs.rtems.org/branches/master/user/bsps/bsps-aarch64.html?highlight=qemu#aarch64-aarch64
tell me to run

qemu-system-aarch64 -no-reboot -nographic -serial mon:stdio \
 -machine virt,gic-version=3 -cpu cortex-a53 -m 4096 \
 -kernel build/aarch64-rtems6-xilinx_zynqmp_lp64_qemu/kernel.exe

which just sits there with no output (I expect a repeated greeting).
Here are my hello.c, init.c, wscript:

  /*
   * Hello world example
   */
  #include <rtems.h>
  #include <stdio.h>

  rtems_task Init(rtems_task_argument ignored) {
      for (;;) {
          puts("Hello World\n");
          rtems_task_wake_after(100);
      }
  }
---------------init.c:
  /*
   * Simple RTEMS configuration
   */

  #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
  #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER

  #define CONFIGURE_UNLIMITED_OBJECTS
  #define CONFIGURE_UNIFIED_WORK_AREAS

  #define CONFIGURE_RTEMS_INIT_TASKS_TABLE

  #define CONFIGURE_INIT
  #define CONFIGURE_INIT_TASK_STACK_SIZE 65536
  #define CONFIGURE_INIT_TASK_ATTRIBUTES RTEMS_FLOATING_POINT
--------wscript:
#
# Hello world Waf script
#
from __future__ import print_function

rtems_version = "6"

try:
    import rtems_waf.rtems as rtems
except:
    print('error: no rtems_waf git submodule')
    import sys
    sys.exit(1)

def init(ctx):
    rtems.init(ctx, version = rtems_version, long_commands = True)

def bsp_configure(conf, arch_bsp):
    # Add BSP specific configuration checks
    pass

def options(opt):
    rtems.options(opt)

def configure(conf):
    rtems.configure(conf, bsp_configure = bsp_configure)

def build(bld):
    rtems.build(bld)

    bld(features = 'c cprogram',
        target = 'kernel.exe',
        cflags = '-g -O2',
        source = ['hello.c',
                  'init.c'])

I've tried many variations on the qemu options but never got any output.
This is with
# qemu-system-aarch64 --version
QEMU emulator version 7.2.50

What am I doing wrong? Has anyone else gotten the example in the RTEMS docs to work
with the described procedure?

Regards,

        Jens