Hi, 专家们：
我在EVM和我们自己的板子上发现，LCD_DATA0~LCD_DATA3 这4根pin的配置不起作用。
EVM上LCD是24bit的，其中LCD_DATA0~LCD_DATA3的pin mux 配置是：（startware02.0.0.7)
HWREG(SOC_CONTROL_REGS + CONTROL_CONF_LCD_DATA(0)) =
(0 << CONTROL_CONF_LCD_DATA0_CONF_LCD_DATA0_MMODE_SHIFT) |
(1 << CONTROL_CONF_LCD_DATA0_CONF_LCD_DATA0_PUDEN_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA0_CONF_LCD_DATA0_PUTYPESEL_SHIFT)|
(1 << CONTROL_CONF_LCD_DATA0_CONF_LCD_DATA0_RXACTIVE_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA0_CONF_LCD_DATA0_SLEWCTRL_SHIFT);
HWREG(SOC_CONTROL_REGS + CONTROL_CONF_LCD_DATA(1)) =
(0 << CONTROL_CONF_LCD_DATA1_CONF_LCD_DATA1_MMODE_SHIFT) |
(1 << CONTROL_CONF_LCD_DATA1_CONF_LCD_DATA1_PUDEN_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA1_CONF_LCD_DATA1_PUTYPESEL_SHIFT)|
(1 << CONTROL_CONF_LCD_DATA1_CONF_LCD_DATA1_RXACTIVE_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA1_CONF_LCD_DATA1_SLEWCTRL_SHIFT);
HWREG(SOC_CONTROL_REGS + CONTROL_CONF_LCD_DATA(2)) =
(0 << CONTROL_CONF_LCD_DATA2_CONF_LCD_DATA2_MMODE_SHIFT) |
(1 << CONTROL_CONF_LCD_DATA2_CONF_LCD_DATA2_PUDEN_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA2_CONF_LCD_DATA2_PUTYPESEL_SHIFT)|
(1 << CONTROL_CONF_LCD_DATA2_CONF_LCD_DATA2_RXACTIVE_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA2_CONF_LCD_DATA2_SLEWCTRL_SHIFT);
HWREG(SOC_CONTROL_REGS + CONTROL_CONF_LCD_DATA(3)) =
(0 << CONTROL_CONF_LCD_DATA3_CONF_LCD_DATA3_MMODE_SHIFT) |
(1 << CONTROL_CONF_LCD_DATA3_CONF_LCD_DATA3_PUDEN_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA3_CONF_LCD_DATA3_PUTYPESEL_SHIFT)|
(1 << CONTROL_CONF_LCD_DATA3_CONF_LCD_DATA3_RXACTIVE_SHIFT) |
(0 << CONTROL_CONF_LCD_DATA3_CONF_LCD_DATA3_SLEWCTRL_SHIFT);
经过测试发现，这4个寄存器如果不配置，它们的缺省值是0x2f, 根据spec,意味着这几根pin是gpio, 但是，实际上并不影响显示和颜色。
也就是说，这4根pin, pin mux的配置不影响显示！！这是什么原因呢？
