Cannot stop the boot process with ctrl+u

[Zubair Khan]

Hello everyone I've a problem while flashing HIKVISION NVR,IPC AND DVR with serial cable. I've reinstalled my os on the laptop which is windows 7 64bit. The serial cable flasher was working fine before reinstalling the os. I've tried with many drivers and different terminal programs likes secure crt, hyper terminal and putty but still no success. I've also tried the win 10 pathced driver which is prolific driver 3.3.2.102 but still same issue. The flasher is fine but it is giving me this creating this issue after reinstalling the os. Any help would be really appreciated.

 

[alastairstevenson]

Any help would be really appreciated.

If you join RX to TX from the USB to serial convertor, do characters typed get echoed?

Have you tried another PL2303-based USB to TTL serial convertor?
Maybe the one you are using is broken. In my experience, they can be quite fragile, I usually buy several at a time.

 

[Zubair Khan]

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If you join RX to TX from the USB to serial convertor, do characters typed get echoed?

Have you tried another PL2303-based USB to TTL serial convertor?
Maybe the one you are using is broken. In my experience, they can be quite fragile, I usually buy several at a time.

Yes Ive tried with another PL2303-baed USB to TTL serial convertor but still same problem. The problem just came after reinstalling the OS both win 7 64 bit and win 10 64bit.

 

[alastairstevenson]

The problem just came after reinstalling the OS both win 7 64 bit and win 10 64bit.

Have you confirmed in Device Manager the COM port number assigned to the USB convertor?
Do characters echo when the USB convertor TX and RX wires are connected to each other?

 

[Zubair Khan]

Here is the video HIKVISION serial flasher can't stop boot with ctrl+u.

 

[alastairstevenson]

Yes Ive tried with another PL2303-baed USB to TTL serial convertor but still same problem.

What you showed in the video is an RS-232 DB9 interface on the NVR.
A PL2303-based serial TTL to USB convertor will not work with that - it's a different type of interface.

Serial TTL uses unipolar signals of 0 - 3v
RS-232 uses bipolar signals of +- 3-15v
Connecting a serial TTL interface to RS-232 is likely to damage the serial TTL convertor.

I know that does not explain why it worked OK before you re-installed Windows.

 

[Zubair Khan]

What you showed in the video is an RS-232 DB9 interface on the NVR.
A PL2303-based serial TTL to USB convertor will not work with that - it's a different type of interface.

Serial TTL uses unipolar signals of 0 - 3v
RS-232 uses bipolar signals of +- 3-15v
Connecting a serial TTL interface to RS-232 is likely to damage the serial TTL convertor.

I know that does not explain why it worked OK before you re-installed Windows.

This converter use to work on these ports as well. I do have a small flasher with RJ45 connector port which i use to flash HIKVISION DVRS AND IPCS.

 

[Zubair Khan]

Do you have any discord server or any other live chat client?

 

[alastairstevenson]

Do you have any discord server or any other live chat client?

Sorry, I don't.

Try an RS232 interface with your NVR.

 

[Zubair Khan]

Got it working, I just run old version of putty and it worked like a charm on both win 7 and win 10 64bit . Thanks anyways for the help alastairstevenson

 

[GiovanniG]

I have the same problem, can't stop uboot pressing ctrl+q, it goes 1 for awhile and returns to 0, I'm sure all is connected perfectly, what can I do?
there is anther break instruction?
the system loads kernel, etc, I have a # prompt after, there is anything there I can do to flash? Actually I just need to reset all config parameters
Thank you

 

[alastairstevenson]

After it boots and the # prompt occurs, does it echo the characters that you type?

Suggestion :

Keep Control-U pressed till it auto-repeats before the DVR is powered on and keep it pressed.
There is not enough time to press it after power is applied.

 

[GiovanniG]

thanks for help, yes it does, in the end of full boot i can type help and I've the list of commands. All is ok.
I've managed to interrupt boot with ctrl+u, but I've a HKVS $ and anything I type is not considered (i see echo, but the command is ignored). What to do now?

 

[GiovanniG]

U-Boot 2010.06-svn (Jun 09 2017 - 17:35:53)[V1.4.5]

Hit ctrl+u to stop autoboot: 0
HKVS $ printenv
HKVS $ setenv ipaddr 192.168.1.200
HKVS $ setenv serverip 192.168.1.232
HKVS $ help
HKVS $ root
HKVS $ su
HKVS $ update
HKVS $

seems nothing is working here, I sniffed ethernet and nothing is coming out from ethernet too

 

[alastairstevenson]

I've a HKVS $ and anything I type is not considered

There is a little trick to entering bootloader commands for that model -
Start the command with setenv, enclose the command with single quotes and precede the command with a semicolon.

Example to list the varibales and list the available commands :

HKVS $ setenv ';printenv'
bootcmd=tftp 0x42000000 $(bootfile);bootm 0x42000000;
default=cramfsload 0x42000000 uImage;
sec=tftp 0x42000000 Ky2017-1-uImage_sec;bootm 0x42000000;
bootdelay=1
baudrate=115200
ipaddr=192.0.0.64
serverip=192.0.0.128
gatewayip=192.0.0.1
netmask=255.255.255.0
bootfile=uImage
passwd=Ff7mqPaKbKihTW5nC3vk5IoiCntz1B0tcwzUMtMOJFI=
phyaddr0=7
mdio_intf=rgmii
ethaddr=64:db:8b:8b:3e:01
stdin=serial
stdout=serial
stderr=serial
verify=n
bootargs=mem=296M console=ttyS0,115200n8 ;printenv

Environment size: 481/4092 bytes
HKVS $ setenv ';help'
?       - alias for 'help'
bootm   - boot application image from memory
brush   - brush a flash image to the Flash, Be Carefully.
bubt    - Burn an boot image on the Boot Flash.
cpld    - write cpld info to  encrypt media
cramfsload- cramfsload  - load binary file from a filesystem image
cramfsls- cramfsls      - list files in a directory (default /)
ddr     - ddr training function
erase_env- erase envirement info on flash
getinfo - print hardware information
help    - print command description/usage
loadb   - load binary file over serial line (kermit mode)
loady   - load binary file over serial line (ymodem mode)
md      - memory display
mii     - MII utility commands
mm      - memory modify (auto-incrementing address)
mw      - memory write (fill)
pflash  - print the compatibility list of flash.
ping    - send ICMP ECHO_REQUEST to network host
printenv- print environment variables
reset   - Perform RESET of the CPU
run     - run commands in an environment variable
saveenv - save environment variables to persistent storage
setenv  - set environment variables
tftp    - tftp  - download or upload image via network using TFTP protocol
update  - Update the digicap of the device.
version - print monitor version
HKVS $
HKVS $

 

[GiovanniG]

thank you! I've wrote a guide how I've solved the problem, here:

https://ipcamtalk.com/threads/hikvision-clearing-passwords-and-or-loading-firmware-via-ttl-serial.28049/post-556441