CRTC4_REGISTER_OFFSET
#define CRTC4_REGISTER_OFFSET (0x477c - 0x1b7c)
#define CRTC4_REGISTER_OFFSET (0x477c - 0x1b7c) //(0x11df0 - 0x6df0)/4
#define CRTC4_REGISTER_OFFSET (0x439c - 0x1b9c)