On my CoffeeLake S board, after compile i915 as a kernel module
will got following error in Xorg.0.log:
    (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission 
    (EE) open /dev/fb0: No such file or directory

This is a timing proble between i915 driver and Xorg,
add a loop to wait device got ready can avoid this timing problem

Liwei Song (2):
  config: wait for DRM device to be successful initiated
  fbdevhw: add loop to wait /dev/fb0 get ready

 config/udev.c                | 9 +++++++++
 hw/xfree86/fbdevhw/fbdevhw.c | 4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)


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