4.10 TF卡驱动调试

4.10.1 硬件原理分析

从原理图上看出，我们只需要配置cmd、bus、clk、det即可。

4.10.1 DTS配置

&sdmmc0 {
    max-frequency = <150000000>;
    supports-sd;
    bus-width = <4>;
    cap-mmc-highspeed;
    cap-sd-highspeed;
    disable-wp;
    sd-uhs-sdr104;
    vmmc-supply = <&vcc3v3_sd>;
    vqmmc-supply = <&vccio_sd>;
    pinctrl-names = "default";
    pinctrl-0 = <&sdmmc0_bus4 &sdmmc0_clk &sdmmc0_cmd &sdmmc0_det>;
    status = "okay";
};

4.10.3 烧写验证

在启动的过程中，我们可能通过log看到sd卡容量等信息，启动后可通过状态栏看到SD卡图标

[    1.127562] mmc0: new ultra high speed SDR50 SDHC card at address aaaa
[    1.128560] mmcblk0: mmc0:aaaa SU04G 3.69 GiB 
[    1.129586]  mmcblk0: p1

启动完成后，可以通过拔插SD卡在状态栏看到SD卡图标，通过拔插SD卡，图标和消失和重现，也可以通过日志看到相应的信息

[  178.470556] mmc0: card aaaa removed
[  178.476117] type=1400 audit(1661436597.336:56): avc: denied { getattr } for comm="kdevtmpfs" path="/mmcblk0p1" dev="devtmpfs" ino=36269 scontext=u:r:kernel:s0 tcontext=u:object_r:device:s0 tclass=blk_file permissive=1
[  178.476647] type=1400 audit(1661436597.336:57): avc: denied { setattr } for comm="kdevtmpfs" name="mmcblk0p1" dev="devtmpfs" ino=36269 scontext=u:r:kernel:s0 tcontext=u:object_r:device:s0 tclass=blk_file permissive=1
[  178.476895] type=1400 audit(1661436597.336:58): avc: denied { unlink } for comm="kdevtmpfs" name="mmcblk0p1" dev="devtmpfs" ino=36269 scontext=u:r:kernel:s0 tcontext=u:object_r:device:s0 tclass=blk_file permissive=1
[  180.376555] mmc_host mmc0: Bus speed (slot 0) = 375000Hz (slot req 400000Hz, actual 375000HZ div = 0)
[  180.561703] mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 100000000Hz, actual 50000000HZ div = 0)
[  180.580325] dwmmc_rockchip fe2b0000.dwmmc: Successfully tuned phase to 360
[  180.580433] mmc0: new ultra high speed SDR50 SDHC card at address aaaa
[  180.585505] mmcblk0: mmc0:aaaa SU04G 3.69 GiB 
[  180.587434] type=1400 audit(1661436599.450:59): avc: denied { create } for comm="kdevtmpfs" name="mmcblk0" scontext=u:r:kernel:s0 tcontext=u:object_r:device:s0 tclass=blk_file permissive=1
[  180.587848] type=1400 audit(1661436599.450:60): avc: denied { setattr } for comm="kdevtmpfs" name="mmcblk0" dev="devtmpfs" ino=44485 scontext=u:r:kernel:s0 tcontext=u:object_r:device:s0 tclass=blk_file permissive=1
[  180.600954]  mmcblk0: p1
[  180.854625] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. se run fsck.