I changed the wifi_pwrseq outside, and the "dmesg | grep mmc" changed a bit:
[ 0.000000] Kernel command line: root=UUID=aee206b3-d10b-44e7-af35-710d9422045d rootwait rootfstype=ext4 console=ttyS0,115200 console=tty1 hdmi.audio=EDID:0 disp.screen0_output_mode=1920x1080p60 panic=10 consoleblank=0 loglevel=1 ubootpart=e3d022de-01 ubootsource=mmc usb-storage.quirks= sunxi_ve_mem_reserve=0 sunxi_g2d_mem_reserve=0 sunxi_fb_mem_reserve=16 cgroup_enable=memory swapaccount=1
[ 2.766391] sunxi-mmc 1c0f000.mmc: Linked as a consumer to regulator.2
[ 2.767303] sunxi-mmc 1c0f000.mmc: Got CD GPIO
[ 2.792927] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 16384 KB
[ 2.793785] sunxi-mmc 1c10000.mmc: Linked as a consumer to regulator.2
[ 2.796379] sunxi-mmc 1c11000.mmc: Linked as a consumer to regulator.2
[ 2.821823] sunxi-mmc 1c11000.mmc: initialized, max. request size: 16384 KB
[ 2.829776] mmc0: host does not support reading read-only switch, assuming write-enable
[ 2.831765] mmc0: Problem switching card into high-speed mode!
[ 2.832007] mmc0: new SDHC card at address 0001
[ 2.834762] mmcblk0: mmc0:0001 00000 7.45 GiB
[ 2.854128] mmcblk0: p1
[ 2.921841] mmc1: new DDR MMC card at address 0001
[ 2.924439] mmcblk1: mmc1:0001 8GND3R 7.28 GiB
[ 2.926419] mmcblk1boot0: mmc1:0001 8GND3R partition 1 4.00 MiB
[ 2.928280] mmcblk1boot1: mmc1:0001 8GND3R partition 2 4.00 MiB
[ 2.930201] mmcblk1: p1
[ 4.325992] sunxi-mmc 1c10000.mmc: allocated mmc-pwrseq
[ 4.349817] sunxi-mmc 1c10000.mmc: initialized, max. request size: 16384 KB
[ 5.827870] EXT4-fs (mmcblk0p1): mounted filesystem with writeback data mode. Opts: (null)
[ 8.151766] EXT4-fs (mmcblk0p1): re-mounted. Opts: commit=600,errors=remount-ro
[ 16.469981] EXT4-fs (mmcblk0p1): resizing filesystem from 276480 to 1911684 blocks
[ 16.628910] EXT4-fs (mmcblk0p1): resized filesystem to 1911684
as shown above, "sunxi-mmc 1c10000.mmc" allocated mmc-pwrseq, and is initialized. but there's no any output if i ran the command "dmesg | grep -i sdio", still no "high speed sdio card" recognized.
By the way, the boot information show those lines:
U-Boot 2019.04-armbian (Apr 13 2019 - 14:24:38 +0800) Allwinner Technology
CPU: Allwinner H3 (SUN8I 1680)
Model: Xunlong Orange Pi PC Plus
DRAM: 1 GiB
MMC: Device 'mmc@1c11000': seq 1 is in use by 'mmc@1c10000'
mmc@1c0f000: 0, mmc@1c10000: 2, mmc@1c11000: 1
the mmc@1c11000, which connected a eMMC, is recognized as 1 while mmc@1c10000, which connected to a ap6212a chip, is recognized as 2