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Linux/DM8107: boot

Part Number: DM8107

Tool/software: Linux

hello

just yesterday we got a board and started it connected via uart serial port, yesterday was ok, I was able co cross compile nginx and had started it, and I did not flash it or did something for rewrite uboot of image, I just created the folder /opt/nginx and had started nginx

but this morning I can't boot :(

I have just this message and nothing moving

could you please help me what to do :((

and yesterday I robooted device 3 times and everything was ok except my files they every time disappeared, how to put it persistently I do not know  

it is a custom board vivotek ND8321

soc is Davinci SM8107AAAR2i

the board has no SDCard slot

I connecting to sdcard by uard Serial Port

The OS was prebuilded NAND 

I was needed to rebuild the image to put there crosscompiled NGINX and LUA for our future solution, I got this board 1 day before, I was able to boot preinstalled OS and just copy to /opt/ nginx and tested that nginx is working, after rebooting all my  files has gone I copy it gain just for test. on next day this board did not want to boot anymore.

I have DVRRDK_03.00.01.03 which was sent by manufacturer to us, but I cant build my img cause manufaturer sent us DVRRDK_03.00.01.03 without dsp libraries. and I do not understand how to flash it becasue there is no SDCard slot

I asked question about crosscompile on this forum and people suggest me to use EZSDK, I downloaded and setted up EZSDK, and compiled nginx successful but how to flash this board with EZSDK I do not know :(

may be if I could build my own img and flash it to board I can unbrick it

thank you very much for help 

LOG from RS interface:

U-Boot 2010.06 (Jul 11 2017 - 11:42:32)

TI813X-GP rev 1.1

L3 clk : 240MHz
IVA clk : 480MHz
ISS clk : 560MHz
DSS clk : 240MHz
ARM clk : 1000MHz
DDR clk : 533MHz

------------ PLL Settings --------------
OSC_0_FREQ : 20MHz

MODENA_N : 1
MODENA_M : 100
MODENA_M2 : 1

L3_N : 19
L3_M : 960
L3_M2 : 4

DSP_N : 19
DSP_M : 750
DSP_M2 : 1

DSS_N : 19
DSS_M : 960
DSS_M2 : 4

IVA_N : 19
IVA_M : 960
IVA_M2 : 2

ISS_N : 19
ISS_M : 1120
ISS_M2 : 2

USB_N : 19
USB_M : 960
USB_M2 : 5

DCO_HS2_MIN : 500
DCO_HS2_MAX : 1000
DCO_HS1_MIN : 1000
DCO_HS1_MAX : 2000
SELFREQDCO_HS2 : 2049
SELFREQDCO_HS1 : 4097

--------- DDR PLL ----------
DDR_N : 0x13
DDR_M : 0x42A
DDR_M2 : 0x2

----------EMIF Timings (identical for 0 & 1)-------
DDR3_EMIF_READ_LATENCY : 0x170209
DDR3_EMIF_TIM1 : 0x132BB953
DDR3_EMIF_TIM2 : 0x20437FDA
DDR3_EMIF_TIM3 : 0x501F87FF
DDR3_EMIF_REF_CTRL : 0xC30
DDR3_EMIF_SDRAM_CONFIG : 0x61C11B32
DDR3_EMIF_SDRAM_ZQCR : 0x50074BE1

----------SW LEVEL Info (EMIF 0) -------
DDR3_PHY_RD_DQS_CS0_BYTE0: 0x00000039
DDR3_PHY_RD_DQS_CS0_BYTE1: 0x00000035
DDR3_PHY_RD_DQS_CS0_BYTE2: 0x00000038
DDR3_PHY_RD_DQS_CS0_BYTE3: 0x00000036

DDR3_PHY_WR_DQS_CS0_BYTE0: 0x0000003E
DDR3_PHY_WR_DQS_CS0_BYTE1: 0x0000003F
DDR3_PHY_WR_DQS_CS0_BYTE2: 0x0000003D
DDR3_PHY_WR_DQS_CS0_BYTE3: 0x0000003E

DDR3_PHY_RD_DQS_GATE_CS0_BYTE0: 0x000000A2
DDR3_PHY_RD_DQS_GATE_CS0_BYTE1: 0x000000A8
DDR3_PHY_RD_DQS_GATE_CS0_BYTE2: 0x000000AA
DDR3_PHY_RD_DQS_GATE_CS0_BYTE3: 0x000000A4

DDR3_PHY_WR_DATA_CS0_BYTE0: 0x00000077
DDR3_PHY_WR_DATA_CS0_BYTE1: 0x00000074
DDR3_PHY_WR_DATA_CS0_BYTE2: 0x00000077
DDR3_PHY_WR_DATA_CS0_BYTE3: 0x00000076

----------SW LEVEL Info (EMIF 1) -------
DDR3_PHY_RD_DQS_CS0_BYTE0: 0x00000039
DDR3_PHY_RD_DQS_CS0_BYTE1: 0x00000035
DDR3_PHY_RD_DQS_CS0_BYTE2: 0x00000038
DDR3_PHY_RD_DQS_CS0_BYTE3: 0x00000036

DDR3_PHY_WR_DQS_CS0_BYTE0: 0x0000003E
DDR3_PHY_WR_DQS_CS0_BYTE1: 0x0000003F
DDR3_PHY_WR_DQS_CS0_BYTE2: 0x0000003D
DDR3_PHY_WR_DQS_CS0_BYTE3: 0x0000003E

DDR3_PHY_RD_DQS_GATE_CS0_BYTE0: 0x000000A2
DDR3_PHY_RD_DQS_GATE_CS0_BYTE1: 0x000000A8
DDR3_PHY_RD_DQS_GATE_CS0_BYTE2: 0x000000AA
DDR3_PHY_RD_DQS_GATE_CS0_BYTE3: 0x000000A4

DDR3_PHY_WR_DATA_CS0_BYTE0: 0x00000077
DDR3_PHY_WR_DATA_CS0_BYTE1: 0x00000074
DDR3_PHY_WR_DATA_CS0_BYTE2: 0x00000077
DDR3_PHY_WR_DATA_CS0_BYTE3: 0x00000076

DRAM: 1 GiB
NAND: HW ECC BCH8 Selected
256 MiB
Using default environment

The 2nd stage U-Boot will now be auto-loaded
Please do not interrupt the countdown till TI813X_EVM prompt if 2nd stage is already flashed
Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x20000, size 0x40000
262144 bytes read: OK
## Starting application at 0x81000000 ...