GPMC_A11管脚没输出

FPGA当作RAM挂在am3354的GPMC上。数据位是16bit的，地址用的是A0到A11。片选用的CS0，异步读写。GPMC上没有NAND等其他东西，只有个FPGA。引脚如图

问题就是：读写都没问题，但是读写地址超过0x800时，地址线A11没有变化，其他地址位都会有变化。

举个例子：往0xC22的地方写0x1234，signaltag抓回来的信号如图

写入的地址显示是0x422，最高地址位A11没有输出高电平。

1.已经再三检查过管脚复用的配置，GPMC_A11管脚就是配成A11，也读取过引脚配置寄存器查看过没问题。

2.把GMPC_A11配成GPIO输出高电平，sinaltag能捕获到。也试过将GMPC_A11配成A11的地址位加上上拉输出使能，发现低地址时A11也一直是高电平，感觉就没有输出。

3.在linux阶段跟uboot阶段都试过读写，一样A11没有任何反应。

管脚配置代码如下：

static struct pinmux_config fpga_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.gpmc_ad8",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_ad9.gpmc_ad9",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_ad10.gpmc_ad10",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_ad11.gpmc_ad11",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_ad12.gpmc_ad12",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_ad13.gpmc_ad13",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_ad14.gpmc_ad14",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_ad15.gpmc_ad15",	  OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_a0.gpmc_a0", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a1.gpmc_a1", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a2.gpmc_a2", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a3.gpmc_a3", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a4.gpmc_a4", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a5.gpmc_a5", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a6.gpmc_a6", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a7.gpmc_a7", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a8.gpmc_a8", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a9.gpmc_a9", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a10.gpmc_a10", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT},
	{"gpmc_a11.gpmc_a11", OMAP_MUX_MODE0 | 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_csn0.gpmc_csn0",	  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},
	{NULL, 0},
};