参照 orangepi pc plus 在设备树中添加了设备信息：
&mmc2 {
pinctrl-names = "default";
pinctrl-0 = <&mmc2_8bit_pins>;
vmmc-supply = <®_vcc3v3>;
bus-width = <8>;
non-removable;
cap-mmc-hw-reset;
status = "okay";
};
&mmc2_8bit_pins {
/* Increase drive strength for DDR modes */
allwinner,drive = <SUN4I_PINCTRL_40_MA>;
/* eMMC is missing pull-ups */
allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
};
启动log:
[ 1.028147] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 8, RTO !!
[ 1.065805] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !!
[ 1.072411] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !!
[ 1.078901] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !!
[ 1.085414] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !!
[ 1.097286] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 1, RTO !!
这会是什么问题？
可以从sd卡启动，说明mmc驱动没有问题，只需要在设备树中添加设备信息就行了。
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