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硬件使用am4378，采用异步模式，数据宽度16bit，与FPGA通信，内核版本kernel 4.4.32
问题：要实现gpmc与fpga通信，基本步骤是什么。
修改dts后，还要添加驱动？
官方sdk中是否有这部分驱动，或有没有可共参考的驱动程序？
采用Linux4.4，地址数据复用，8bit位宽，使用修改dts如下：
&gpmc { /* * When enabling GPMC, disable eMMC and set * SelEMMCorNAND to output-low */ status = "disabled"; pinctrl-names = "default", "sleep"; pinctrl-0 = <&nand_flash_x8_default>; pinctrl-1 = <&nand_flash_x8_sleep>; ranges = < 3 0 0x0a000000 0x02000000 fpga@3,0 { reg = <3 0 0x400>; compatible = "fpga-dpram"; bank-width = <1>; /* 8 bit mode */ gpmc,mux-add-data = <2>; /* address-data multiplexing */ gpmc,cs-on-ns = <0>; gpmc,cs-rd-off-ns = <60>; gpmc,cs-wr-off-ns = <60>; gpmc,adv-on-ns = <0>; gpmc,adv-rd-off-ns = <20>; gpmc,adv-wr-off-ns = <20>; gpmc,we-on-ns = <20>; gpmc,we-off-ns = <50>; gpmc,oe-on-ns = <20>; gpmc,oe-off-ns = <50>; gpmc,rd-cycle-ns = <60>; gpmc,wr-cycle-ns = <60>; };
};
启动后，/dev下没有设备操作符，/sys/devices/platform/44000000.ocp/50000000.gpmc下有8000000.fpga这个设备
请问，除了DTS文件外是否需要做其他地方的修改，如何操作gpmc设备？是否需要再添加其他驱动。
我看网上有一个am3359的GPMC驱动教程，貌似移植起来头文件差别比较大。
GPMC如果和FPGA使用NOR的方式连接
初始化好了之后，直接访问NOR的那块物理地址就可以了。
