Linux内核移植 part3：eMMC驱动

时间：2022-05-30 12:22:16

单个的人是软弱无力的，就像漂流的鲁滨孙一样，只有同别人在一起，他才能完成许多事业。 —— 叔本华

内核版本：4.1
硬件平台：迅为exynos 4412开发板

移植eMMC驱动很快就结束了，从exynos4412-trats2.dts中拷贝配置，直接就能工作（删除vmmc-supply属性）。

mmc@12550000 {
        num-slots = <1>;
        broken-cd;
        non-removable;
        card-detect-delay = <200>;
        vmmc-supply = <&ldo22_reg>;
        clock-frequency = <400000000>;
        samsung,dw-mshc-ciu-div = <0>;
        samsung,dw-mshc-sdr-timing = <2 3>;
        samsung,dw-mshc-ddr-timing = <1 2>;
        pinctrl-0 = <&sd4_clk &sd4_cmd &sd4_bus4 &sd4_bus8>;
        pinctrl-names = "default";
        status = "okay";
        bus-width = <8>;
        cap-mmc-highspeed;
    };

编译选项

Linux内核移植 part3：eMMC驱动

启动日志

[    0.813637] dwmmc_exynos 12550000.mmc: 1 slots initialized
[    0.818063] Registering SWP/SWPB emulation handler
[ 0.823968] hctosys: unable to open rtc device (rtc0)
[ 0.843223] Warning: unable to open an initial console.
[ 0.849600] Freeing unused kernel memory: 3544K (c047a000 - c07f0000)
[ 0.886254] mmc1: MAN_BKOPS_EN bit is not set
[ 0.890402] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req 52000000Hz, actual 50000000HZ div = 0)
[ 0.899076] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1)
[ 0.908801] mmc1: new DDR MMC card at address 0001
[ 0.913998] mmcblk1: mmc1:0001 4YMD3R 3.64 GiB 
[ 0.918052] mmcblk1boot0: mmc1:0001 4YMD3R partition 1 4.00 MiB
[ 0.923997] mmcblk1boot1: mmc1:0001 4YMD3R partition 2 4.00 MiB
[ 0.929893] mmcblk1rpmb: mmc1:0001 4YMD3R partition 3 512 KiB
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