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   Make it possible to use RI_WRONLY for the aframebuffer during early boot.
   In this case, the caller has to provide the backing store for the screen
   contents by setting the ri_bs member of "struct rasops_info".  The screen
   contents are retained if the rasops_info descriptor is later reinitialized
   after adding the RI_VCONS flag.

   ok yasuoka@, deraadt@

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