ochentay4
[ 1.813044@0] ethernet base addr is fe0c0000
[ 1.847191@0] stmmac - user ID: 0x10, Synopsys ID: 0x33
[ 1.852354@0] Normal descriptors
[ 1.855655@0] Ring mode enabled
[ 1.858857@0] No HW DMA feature register supported
[ 1.863541@0] Wake-Up On Lan supported
[ 1.887259@0] libphy: stmmac: probed
[ 1.887291@0] eth%d: PHY ID 02430c54 at 0 IRQ POLL (stmmac-0:00) active
[ 44.808738@1] eth0: device MAC address 00:01:23:cd:ee:af
This is seemingly good, which unfortunately does not mean good. 
(Well, that sounds like a pretty paradox.)
I have to ask if the device had the factory Android ROM on it, or is it possible that you crossflashed with the ROM of a similar device, such as the original (non-Tronsmart) MXIII or the ROM of another MXIII clone.
Unfortunately, this is an important question because I can't find any errors based on the kernel log, but this symptom you report usually occurs when it doesn't have the factory uboot bootloader on the device.
Another thing: based on the log, it seems that either the SD card or the slot is problematic because there are a lot of I/O errors:
[ 4.791202@2] mmcblk0: r/w command failed, status = 0x80000b00
[ 4.791224@2] end_request: I/O error, dev mmcblk0, sector 3887096
[ 4.791235@2] Buffer I/O error on device mmcblk0, logical block 485887
[ 4.792048@2] mmcblk0: r/w command failed, status = 0x80000b00
[ 4.792065@2] mmc_blk_reset 939 reset error md->reset_done:1 and type:1
[ 4.792074@2] end_request: I/O error, dev mmcblk0, sector 3887096
[ 4.792083@2] Buffer I/O error on device mmcblk0, logical block 485887
[ 4.898018@2] mmcblk0: r/w command failed, status = 0x80000b00
[ 4.898043@2] end_request: I/O error, dev mmcblk0, sector 3887096
[ 4.898056@2] Buffer I/O error on device mmcblk0p2, logical block 353791
[ 4.898883@2] mmcblk0: r/w command failed, status = 0x80000b00
[ 4.898900@2] mmc_blk_reset 939 reset error md->reset_done:1 and type:1
[ 4.898910@2] end_request: I/O error, dev mmcblk0, sector 3887096
[ 4.898920@2] Buffer I/O error on device mmcblk0p2, logical block 353791
[ 5.389003@0] mmcblk0: r/w command failed, status = 0x80000b00
[ 5.389027@0] end_request: I/O error, dev mmcblk0, sector 3887096
[ 5.389039@0] Buffer I/O error on device mmcblk0, logical block 485887
[ 5.389856@0] mmcblk0: r/w command failed, status = 0x80000b00
[ 5.389873@0] mmc_blk_reset 939 reset error md->reset_done:1 and type:1
[ 5.389883@0] end_request: I/O error, dev mmcblk0, sector 3887096
[ 5.389892@0] Buffer I/O error on device mmcblk0, logical block 485887
...
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If the system is already running from internal memory, it is irrelevant, but this log is apparently still made from the SD card.
