#define FB_ADDR     0x21200000
#define SCREEN_STRIDE   1024
#define SCREEN_W    960
#define SCREEN_H    544

    register int cpu_id = get_cpu_id();
    const unsigned int colors[4] = {0xFF0000FF, 0xFF00FF00, 0xFFFF0000, 0xFF00FFFF};
    int i, j;
    for (i = (SCREEN_H / 4) * cpu_id; i < (SCREEN_H / 4) * cpu_id + (SCREEN_H / 4); i++) {
        for (j = 0; j < SCREEN_W; j++) {
            ((volatile unsigned int *)FB_ADDR)[j + i * SCREEN_STRIDE] = colors[cpu_id];
        }
    }