I downloaded the latest stock firmware - I was surprised that there was 113k4 version! - unpacked kernel image, decompiled device tree and compared to what I use in my builds: after that I changed two eMMC parameters: GAfI
The change will be included in my next release with all previous fixes from this thread.
Ah, that is excellent! Thank you for your very swift support 
This is always an issue with these cheap devices: there is no kernel source code.
Let's try a modified device tree: mk808b-new-device-tree
Working!
What did you do...?
Here is the dmesg:
Muh Hew Please test if with this build your internal memory works correctly: mk808b-revert-mmc-bounce
No, unfortunately it does not work 
I have also tested your OpenELEC 5.0.8.20 (kernel 3.10.61) and this does not work either.
There may be some difference with the eMMC driver between your kernel version and the factory Android version 3.10.33
I will try to compile a build for you with an older version of eMMC driver. Please give me a few days for this. Curiously, you are the first person to report issues with eMMC driver.
Thank you. I am looking forward to test it.
For reference, here is the original Android dmesg
and here is the item I bought
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It's eMMC driver that fails and not NAND, actually. Have you tried running MXQ and HD18Q builds? They have some differences in device tree, that might help. Can you also get me dmesg from Android?
Same problem with these builds.
Here is the dmesg from recovery which sees the NAND. (currently I wasn't able to restore the
original firmware, perhaps my backup was bad). So you are probably right that the problem is with the emmc driver.
Can you try tunning 7.0.1.2?
No, the result is the same. Here is the complete boot log when booting from
the external SD card. It seems that it first successfully finds the external
SD (3.67 GiB), but fails with initialization of the NAND.
Hi,
I have a cheap MK808B+ which I tried Libreelec on. Installing to a SD-card works
just fine. But when I tried to flash it to the internal NAND, I get a lot of these in the kernel messages (and booting fails, dropping to a debugging shell)
[ [email protected]] [aml_sdhc_print_err] emmc: rsp CRC error, port=5, Cmd13 Arg 00010000, xfer_step=3, status=3, cmd25=0, fifo_empty=0, fifo_full=0, timeout=0, iSTA=0x4, STAT=0xf0003e
[ [email protected]] Pinmux: REG2=0x0000fc00, REG3=0x05000000, REG4=0x700003c0, REG5=0x00000000, REG6=0x0000ff7f, REG8=0x00000000
[ [email protected]] ***********SDHC_REGS***********
[ [email protected]] SDHC_ARGU: 0x00001a00
[ [email protected]] SDHC_SEND: 0x0000004d
[ [email protected]] SDHC_CTRL: 0xe7ffe000
[ [email protected]] SDHC_STAT: 0x00f0003e
[ [email protected]] SDHC_CLKC: 0x0002f011
[ [email protected]] SDHC_ADDR: 0x2e000000
[ [email protected]] SDHC_PDMA: 0x2c43bcf0
[ [email protected]] SDHC_MISC: 0xe0000150
[ [email protected]] SDHC_DATA: 0x00000000
[ [email protected]] SDHC_ICTL: 0x00003067
[ [email protected]] SDHC_ISTA: 0x00000004
[ [email protected]] SDHC_SRST: 0x00000000
[ [email protected]] SDHC_ESTA: 0x00000000
[ [email protected]] SDHC_ENHC: 0x00fe0cff
[ [email protected]] SDHC_CLK2: 0x0000100f
It seems like there is a problem initializing the NAND.
Am I having a bad/unsupported NAND? How can a determine which NAND type I have?
The Factory-installed Android works fine.
