CO_REG_CONTROL
cyber2000fb_writeb(0, CO_REG_CONTROL, cfb);
cyber2000fb_writeb(0, CO_REG_CONTROL, cfb);
while (cyber2000fb_readb(CO_REG_CONTROL, cfb) & CO_CTRL_BUSY) {
cyber2000fb_writeb(0, CO_REG_CONTROL, cfb);