RTOS/AM5728: FatFS open error

Part Number: AM5728

Tool/software: TI-RTOS

Hi,

 I encountered a problem about mmc1. When I called the FATFS_open(0U, NULL, &fsHandle) to open the FatFs mmc1 module, it returned error with -1. I tried to call FATFS_open(2U, NULL, &fsHandle) using the same application to operate the mmc3 module, and it success. I also modified the dts file to enable the mmc0, and operate the mmc1 on linux, it worked normally. So I want to know where I make mistake, and what I can do to open mmc1 module.

The mmc1 part of dts file:

&mmc1 {
    status = "disabled";
    pinctrl-names = "default", "hs", "sdr12", "sdr25", "sdr50", "ddr50", "sdr104";
    pinctrl-0 = <&mmc1_pins_default>;
    pinctrl-1 = <&mmc1_pins_hs>;
    pinctrl-2 = <&mmc1_pins_sdr12>;
    pinctrl-3 = <&mmc1_pins_sdr25>;
    pinctrl-4 = <&mmc1_pins_sdr50>;
    pinctrl-5 = <&mmc1_pins_ddr50 &mmc1_iodelay_ddr_rev20_conf>;
    pinctrl-6 = <&mmc1_pins_sdr104 &mmc1_iodelay_sdr104_rev20_conf>;
    vmmc-supply = <&vdd_3v3>;
    vmmc_aux-supply = <&ldo1_reg>;
    ti,late-attach;
    ti,no-idle-on-init;
    ti,no-reset-on-init;
    keep-power-in-suspend;
    compatible = "ti,dra7-hsmmc", "ti,omap4-hsmmc";
    reg = <0x4809c000 0x400>;
    interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
    ti,hwmods = "mmc1";
    ti,dual-volt;
    ti,needs-special-reset;
    ti,needs-special-hs-handling;
    dmas = <&sdma_xbar 61>, <&sdma_xbar 62>;
    dma-names = "tx", "rx";
    pbias-supply = <&pbias_mmc_reg>;
    max-frequency = <192000000>;
    /delete-property/sd-uhs-sdr104;
    /delete-property/sd-uhs-sdr50;
    /delete-property/sd-uhs-ddr50;
    /delete-property/sd-uhs-sdr25;
    /delete-property/sd-uhs-sdr12;
    #address-cell = <1>;
    #size-cell = <0>;
};

/delete-node/&mmc1;

The version of hardware and software:
Sitara AM5728 M4, MMC1 module;
ti-processor-sdk-rtos-am57xx-evm-05.03.00.07;
pdk_am57xx_1_0_14