Your eMMC can not be read, maybe because of cheap quality, wrong dtb, …
You only can try by yourself and check every time dmesg
if the eMMC goes online.
Remember: Tanix is NOT in the list of supported devices from ceemmc
.
[ 1.004408@1] meson-mmc: mmc driver version: 3.02, 2017-05-15: New Emmc Host Controller
[ 1.007676@3] meson-mmc: >>>>>>>>hostbase ffffff8008422000, dmode
[ 1.050140@3] meson-mmc: meson_mmc_probe() : success!
[ 1.061723@1] meson-mmc: >>>>>>>>hostbase ffffff800842c000, dmode
[ 1.062239@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.062243@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.062297@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.062303@2] meson-mmc: meson_mmc_irq_thread() 2795: set 1st retry!
[ 1.062305@2] meson-mmc: retry cmd 1 the 10-th time(s)
[ 1.062308@2] meson-mmc: emmc: retry, rx_phase 0 -> 1
[ 1.063402@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.063405@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.063425@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.063429@2] meson-mmc: retry cmd 1 the 9-th time(s)
[ 1.063432@2] meson-mmc: emmc: retry, rx_phase 1 -> 2
[ 1.064474@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.064475@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.064487@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.064491@2] meson-mmc: retry cmd 1 the 8-th time(s)
[ 1.064493@2] meson-mmc: emmc: retry, rx_phase 2 -> 3
[ 1.065517@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.065518@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.065530@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.065534@2] meson-mmc: retry cmd 1 the 7-th time(s)
[ 1.065536@2] meson-mmc: emmc: retry, rx_phase 3 -> 0
[ 1.066629@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.066631@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.066645@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.066648@2] meson-mmc: retry cmd 1 the 6-th time(s)
[ 1.066650@2] meson-mmc: emmc: retry, rx_phase 0 -> 1
[ 1.067749@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.067751@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.067760@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.067763@2] meson-mmc: retry cmd 1 the 5-th time(s)
[ 1.067765@2] meson-mmc: emmc: retry, rx_phase 1 -> 2
[ 1.068786@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.068788@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.068797@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.068800@2] meson-mmc: retry cmd 1 the 4-th time(s)
[ 1.068801@2] meson-mmc: emmc: retry, rx_phase 2 -> 3
[ 1.069826@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.069828@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.069837@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.069842@2] meson-mmc: retry cmd 1 the 3-th time(s)
[ 1.069843@2] meson-mmc: emmc: retry, rx_phase 3 -> 0
[ 1.070941@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.070943@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.070958@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.070961@2] meson-mmc: retry cmd 1 the 2-th time(s)
[ 1.070963@2] meson-mmc: emmc: retry, rx_phase 0 -> 1
[ 1.072064@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.072065@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.072077@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.072080@2] meson-mmc: retry cmd 1 the 1-th time(s)
[ 1.072082@2] meson-mmc: emmc: retry, rx_phase 1 -> 2
[ 1.073184@0] meson-mmc: emmc: resp_timeout,vstat:0xa1ff2800,virqc:3fff
[ 1.073185@0] meson-mmc: emmc: err: wait for irq service, bus_fsm:0x8
[ 1.073196@2] meson-mmc: meson_mmc_irq_thread 2779 emmc: cmd:1
[ 1.073199@2] meson-mmc: Command retried failed line:2899, cmd:1