Problems running example isr

Dear L4Hackers,

I have a problem running the example "isr" in the pkg/examples/sys/isr
folder in l4 source. It prints "isr     | Press keys now, Shift-Q to exit"
then It fails to detect any interrupts and just keeps waiting. My
configuration is as follows, emulated using Qemu on vexpress-a15 machine:

modules.list:

entry isr
kernel fiasco -jdb_cmd=JS -serial_esc
roottask moe rom/ex_isr.cfg
module ex_isr.cfg
module isr
module ned
module l4re
module keyboard.io
module arm-ve.devs
module io
module cons

arm-ve.devs:
-- vim:set ft=lua:

local Res = Io.Res
local Hw = Io.Hw

Io.hw_add_devices(function()
  KBD = Hw.Device(function()
    Property.hid = "AMBA KMI Kbd";
    compatible = {"arm,pl050","arm,primecell"};
    Resource.irq = Res.irq(44);
    Resource.regs = Res.mmio(0x1c060000, 0x1c060010);
  end);
end)

keyboard.io:
local hw = Io.system_bus();

Io.add_vbus("keyboard", Io.Vi.System_bus
{
  amba = wrap(hw:match("arm,pl050"));
})

ex_isr.cfg:
local L4 = require("L4");

local loader = L4.default_loader;
vbus_key = loader:new_channel();

local cons = loader:new_channel();
loader:start(
  { caps = { cons = cons:svr() },
  log = L4.Env.log, },
  "rom/cons -k -a"
  );

L4.default_loader.log_fab = cons;

loader:start(
  { caps = {
      sigma0  =
L4.cast(L4.Proto.Factory,L4.Env.sigma0):create(L4.Proto.Sigma0);
      icu     = L4.Env.icu;
      keyboard = vbus_key:svr();
     },
     l4re_dbg = L4.Dbg.Boot,
     log = {"IO", "magenta"},
  }, "rom/io -vvv rom/arm-ve.devs rom/keyboard.io");

loader:start({
caps = { icu = L4.Env.icu; vbus = vbus_key },
log = {"isr", "cyan", "key=1"},
}, "rom/isr");

where "rom/isr" refers to the example file "isr/main.c" provided.

Thank you so much
Nourhan

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