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Now zero copy and tear free buffer swapping is also supported
for 16bpp desktop.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

Avoid creating a new mapping because that's a waste of the virtual address
space. Also we are going to use this xserver framebuffer mapping address
for testing whether window backing pixmaps are allocated in the framebuffer
and can be accelerated by G2D.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

It is basically the first test program for the sunxi disp ioctls wrapper
code from "src/sunxi_disp.c".
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>