实现一个gpmc与nandflash芯片通讯和一个gpmc与FPGA模拟的nandflash通讯

各位大侠，早上好：
          根据上面的帖子的原理图，我想实现一个gpmc与nandflash芯片通讯和一个gpmc与FPGA模拟的nandflash通讯，具体步骤如下：
         1.通过GPMC的CS0与nandflash（K9F1G08U0D）通讯，这个容易调试，已经通了。
          2.通过GPMC的CS1与FPGA模拟nandflash的读时序和写时序进行通讯，这一步一直也没有调通，还请各位大侠帮忙。
          我一直比较疑惑的是，CS1的初始化和与FPGA模拟nandflash的设备文件，现在CS0和CS1都是共用其它信号，初始化应该初始化一次是比较好的。
原理图如下：

初始化代码如下：
/* Pin mux for nand flash module */
static struct pinmux_config nand_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_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_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],
[NULL, 0],
]

static void evm_nand_init(int evm_id, int profile)
[
struct omap_nand_platform_data *pdata;
struct omap_nand_platform_data *pdata1;
struct gpmc_devices_info gpmc_device[2] = [
[ NULL, 0 ],
[ NULL, 0 ],
];
pr_info("file:%s,func:%s,line:%dn",__FILE__,__func__,__LINE__); 
setup_pin_mux(nand_pin_mux);
pdata = omap_nand_init(am335x_nand_partitions,
ARRAY_SIZE(am335x_nand_partitions), 0, 0,
&am335x_nand_timings);
if (!pdata)
return;
pdata->ecc_opt =OMAP_ECC_BCH8_CODE_HW;
pdata->elm_used = true;
gpmc_device[0].pdata = pdata;
gpmc_device[0].flag = GPMC_DEVICE_NAND;
pr_info("file:%s,func:%s,line:%d cs:%dn",__FILE__,__func__,__LINE__,pdata->cs);
pdata1 = omap_nand_init(am335x_nand_partitions,
ARRAY_SIZE(am335x_nand_partitions), 1, 0,
&am335x_nand_timings);
if (!pdata1)
return;
pdata1->ecc_opt =OMAP_ECC_BCH8_CODE_HW;
pdata1->elm_used = true;
gpmc_device[1].pdata = pdata1;
gpmc_device[1].flag = GPMC_DEVICE_NAND;
pr_info("file:%s,func:%s,line:%d cs:%dn",__FILE__,__func__,__LINE__,pdata->cs);
omap_init_gpmc(gpmc_device, sizeof(gpmc_device));
omap_init_elm();
请各位指点一下，谢谢