You can find these files in the BSP Layer at:
meta-bsp_name
/recipes-graphics/*
This optional directory contains recipes for the BSP if it has
special requirements for graphics support.
All files that are needed for the BSP to support a display are
kept here.
For example, the meta-emenlow
layer,
which supports the eMenlow platform consisting of the
Intel®
Atom™
Z5xx processor with the
Intel®
System Controller Hub US15W, uses these files for supporting
the Video Electronics Standards Association (VESA) graphics:
meta-emenlow/recipes-graphics/xorg-xserver/xserver-xf86-config_0.1.bbappend meta-emenlow/recipes-graphics/xorg-xserver/xserver-xf86-config/emenlow-noemgd/xorg.conf