Can somebody tell me why is my network on camera dahua sd-50255u-hni not working when i connect it to computer or switch...i have a ttl to usb serial conection on putty.
I can see that network link is down,like there is  no connection on my computer or a switch. I have conected it to a switch with blink indicator (there is no light on camera input on it but there is on my computer indicator flashing).
When i boot the camera there is no network conection, then i turn it off...
wait a minute or two plug it back in ...then there is network for a shor while and still no network...(notice i didn`touched anything in between two boot ups..
I have flashed camera with DH_SD-Eos_Eng_P_Stream3_V2.623.0000000.1.R.180627.bin 
and it worked ok, it booted up - but then i flashed with the small file i tought it was for ptz controls (that was my mistacke - it got flashed with smaller file i it wont boot and won`t show on network..
My adapter is set to 192.168.1.1
mask:255.255.255.0
aditional adress aded in network adapter on computer 192.168.254.254 - subnet 255.255.255.0
....
nework link is once up and once down (for a second or two) why?
thank you
this is my boot log
U-Boot 2010.06-svn3089 (Jul 12 2016 - 21:13:31)
DRAM:  1 GiB
gBootLogPtr:80b80008.
NAND:  Check nand flash controller v610. found
Special NAND id table Version 1.36
Nand ID: 0x92 0xF1 0x80 0x95 0x40 0x7F 0x7F 0x7F
NAND_ECC_NONE selected by board driver. This is not recommended !!
128 MiB
partition file version 2
rootfstype squashfs root /dev/mtdblock7
In:    serial
Out:   serial
Err:   serial
TEXT_BASE:81000000
Net:   PHY found at 1
ETH0: PHY(phyaddr=-1, rmii) not link!
Try again use backup_serverip
ETH0: PHY(phyaddr=-1, rmii) not link!
Failed to get info.txt
Fail to get info file!
Init error!
ETH0: PHY(phyaddr=-1, rmii) not link!
state:ff,err_count:00
## Booting kernel from Legacy Image at 82000000 ...
   Image Name:   Linux-3.4.35
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2641032 Bytes = 2.5 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Loading Kernel Image ...OK
OK
partition file version 2
rootfstype squashfs root /dev/mtdblock7
fail to load bootargsParameters.txt
fail to load bootargsParameters.txt file
get bootargs info failed
cmdLine mem=256M console=ttyS0,115200 root=/dev/mtdblock7 rootfstype=squashfs
Starting kernel ...
Uncompressing Linux... done, booting the kernel.
--
___
U-Boot 2010.06-svn3089 (Jul 12 2016 - 21:13:31)
DRAM:  1 GiB
gBootLogPtr:80b80008.
NAND:  Check nand flash controller v610. found
Special NAND id table Version 1.36
Nand ID: 0x92 0xF1 0x80 0x95 0x40 0x7F 0x7F 0x7F
NAND_ECC_NONE selected by board driver. This is not recommended !!
128 MiB
partition file version 2
rootfstype squashfs root /dev/mtdblock7
In:    serial
Out:   serial
Err:   serial
TEXT_BASE:81000000
Net:   PHY found at 1
ETH0: PHY(phyaddr=-1, rmii) link UP: DUPLEX=FULL : SPEED=100M
MAC:   00-12-34-56-78-9A
Using gmac device
TFTP from server 192.168.254.254; our IP address is 192.168.1.108; sending throu                                                                                                                                                             gh gateway 192.168.1.1
Download Filename 'upgrade_info_7db780a713a4.txt'.
Download to address: 0x84000000
Downloading: *
Retry count exceeded; starting again
Try again use backup_serverip
ETH0: PHY(phyaddr=-1, rmii) not link!
Failed to get info.txt
Fail to get info file!
Init error!
ETH0: PHY(phyaddr=-1, rmii) not link!
state:ff,err_count:01
## Booting kernel from Legacy Image at 82000000 ...
   Image Name:   Linux-3.4.35
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2641032 Bytes = 2.5 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Loading Kernel Image ...OK
OK
partition file version 2
rootfstype squashfs root /dev/mtdblock7
fail to load bootargsParameters.txt
fail to load bootargsParameters.txt file
get bootargs info failed
cmdLine mem=256M console=ttyS0,115200 root=/dev/mtdblock7 rootfstype=squashfs
crashflasg:1, logmagic:54410011.
Starting kernel ...
Uncompressing Linux... done, booting the kernel.