你好：
我在项目中使用AM335X，出现如下问题：
NAND设备已经使用了GPMC_AD0 ~GPMC_AD7。LCD的RGB信号为565格式。
用于启动的BOOT[15...0]配置如下：1000 0010 0011 0011b
由于管脚紧张，想使用GPMC_AD8 ~ GPMC_AD15的GPIO功能控制LED灯。目前调试时发现对应管脚上无电平变化。
还有，这样做是否会影响LCD的显示？因为下文中将其屏蔽。
谢谢！
附录：
1. LINUX内核board-am335xevm.c文件中，修改如下：
/* Module pin mux for LCDC */
static struct pinmux_config lcdc_pin_mux[] = {
{"lcd_data0.lcd_data0", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data1.lcd_data1", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data2.lcd_data2", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data3.lcd_data3", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data4.lcd_data4", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data5.lcd_data5", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data6.lcd_data6", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data7.lcd_data7", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data8.lcd_data8", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data9.lcd_data9", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data10.lcd_data10", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data11.lcd_data11", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data12.lcd_data12", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data13.lcd_data13", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data14.lcd_data14", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
{"lcd_data15.lcd_data15", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT
| AM33XX_PULL_DISA},
// {"gpmc_ad8.lcd_data23", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
// {"gpmc_ad9.lcd_data22", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
// {"gpmc_ad10.lcd_data21", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
// {"gpmc_ad11.lcd_data20", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
// {"gpmc_ad12.lcd_data19", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
// {"gpmc_ad13.lcd_data18", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
// {"gpmc_ad14.lcd_data17", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
// {"gpmc_ad15.lcd_data16", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
{"lcd_vsync.lcd_vsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
{"lcd_hsync.lcd_hsync", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
{"lcd_pclk.lcd_pclk", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
{"lcd_ac_bias_en.lcd_ac_bias_en", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
{NULL, 0},
};
/* Pin mux for GPMC bus */
static struct pinmux_config gpmc_pin_mux[] = {
{"gpmc_ad0.gpmc_ad0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad1.gpmc_ad1", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad2.gpmc_ad2", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad3.gpmc_ad3", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad4.gpmc_ad4", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad5.gpmc_ad5", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad6.gpmc_ad6", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad7.gpmc_ad7", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_ad8.gpio0_22", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_ad9.gpio0_23", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_ad10.gpio0_26", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_ad11.gpio0_27", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_ad12.gpio1_12", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_ad13.gpio1_13", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_ad14.gpio1_14", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_ad15.gpio1_15", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT},
{"gpmc_wait0.gpmc_wait0", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_wpn.gpmc_wpn", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT_PULLUP},
{"gpmc_csn1.gpmc_csn1", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_advn_ale.gpmc_advn_ale", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_oen_ren.gpmc_oen_ren", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_wen.gpmc_wen", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_ben0_cle.gpmc_ben0_cle", OMAP_MUX_MODE0 | AM33XX_PULL_DISA},
{"gpmc_clk.gpmc_clk", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT},
{"ecap0_in_pwm0_out.xdma_event_intr2", OMAP_MUX_MODE6 | AM33XX_PIN_INPUT}, // DMAREQ
{NULL, 0},
};
GPIO设备的驱动程序见附件。
谢谢！！
