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/**

 * Sets up the palette for the 8-bit color depth configuration so that the

 * 3:2:3 color scheme can be used. Checks that setting the palette makes sense

 * (appropriate nodes exist in the OBP tree and the color depth is not greater

 * than 8).

 *

 * @return  true if the palette has been set, false otherwise

 */

int setup_palette(void)

{

    char device_name[BUF_SIZE];

    /* resolve alias */

    if (ofw_get_property(ofw_aliases, "screen", device_name,

        sizeof(device_name)) <= 0)

        return false;

    /* for depth greater than 8 it makes no sense to set up the palette */

    uint32_t depth;

    phandle device = ofw_find_device(device_name);

    if (device == -1)

        return false;

    if (ofw_get_property(device, "depth", &depth, sizeof(uint32_t)) <= 0)

        return false;

    if (depth != 8)

        return false;

    /* required in order to be able to make a method call */

    ihandle screen = ofw_open(device_name);

    if (screen == -1)

        return false;

    /* setup the palette so that the 3:2:3 scheme is usable */

    unsigned int i;

    for (i = 0; i < 256; i++)

        if (ofw_call("call-method", 6, 1, NULL, "color!", screen,

            i,

            i << 5,

            (i >> 3) << 6,

            (i >> 5) << 5) != 0);

    return true;

}