Turns out integratorcm_init() depends on the memsz property being
already set, but that unfortunately is not the case as setting of memsz
depends on integratorcm_init() having completed:

    dev = qdev_create(NULL, TYPE_INTEGRATOR_CM);            <= calls 
integratorcm_init(), needs memsz
    qdev_prop_set_uint32(dev, "memsz", ram_size >> 20);     <= memsz set here, 
needs dev

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https://bugs.launchpad.net/bugs/1624726

Title:
  Integrator/CP regression after QOM'ification of integratorcp.c

Status in HelenOS branches:
  New
Status in QEMU:
  New

Bug description:
  The following command line no longer works (i.e. the guest does not
  boot) with QEMU 2.7.0:

      qemu-system-arm -M integratorcp -m 128M -kernel
  HelenOS-0.6.0-arm32-integratorcp.boot

  The HelenOS image can be downloaded here:

  http://www.helenos.org/releases/HelenOS-0.6.0-arm32-integratorcp.boot

  I did git bisect and came to this revision:

  a1f42e0c9abc1028a8bb8686dbb3749fcd2d18e8 is the first bad commit
  commit a1f42e0c9abc1028a8bb8686dbb3749fcd2d18e8
  Author: xiaoqiang.zhao <zxq_yx_...@163.com>
  Date:   Mon Mar 7 15:05:44 2016 +0800

      hw/arm: QOM'ify integratorcp.c
      
      * Drop the use of old SysBus init function and use instance_init
      * Remove the empty 'icp_pic_class_init' from Typeinfo
      
      Signed-off-by: xiaoqiang zhao <zxq_yx_...@163.com>
      Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
      Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>

  :040000 040000 b73418ea3fb69ed72438776e78786456fe4c414c
  b483e8579037fdae7d136b2f4ada3147bdde92f1 M      hw

  Upon closer inspection, I discovered that for some reason s->memsz in
  integratorcm_init() is zero. In the last good revision, this value was
  128. As a temporary workaround, hardcoding it to this expected value
  fixes the problem.

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