AM335x GPMC使用总结

AM335X GPMC使用比较灵活，可以配置为

●    8-bit 同步或者异步并行总线 (非burst)

●     16-bit 同步或者异步并行中线

●     16-bit 非复用的NORFlash

●     16-bit 数据和地址总线复用的NORFlash

●     8-bit 和 16-bitNAND Flash

●     16-bit pSRAM.

 

下面以EVB335X扩展EXAR ST16C554为例，讲解如何配置GPMC。

1.      配置GPMC引脚

static structpinmux_config gpmc_pin_mux[] = {

       /********* 8-bit data bus **************/

       {"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},