To change LCD parameters, you can either do it in kernel or user space.
For v3.2 kernel, you could grep “PM070WL4” and see how we add this panel into kernel. For fdt device tree kernel, you can simply do this in dts file.
If you would like to modify display parameter in user space, you need to put your LCD parameters into /etc/fb.modes and then
# fbset <mode.name>Tags: LCD Resolutions, v3.12, v3.2