[solved] How to DeBrick O2 6431 / Arcadyan VGV7510KW22 - loop bootloader?

Hello,
i tryed to flash the Bootloader: openwrt-lantiq-vgv7510kw22_nor-u-boot.img
to my O2 6431 / Arcadyan VGV7510KW22.

load the bootloader to ram and then load openwrt-lantiq-vgv7510kw22_nor-u-boot.img
run write-uboot-nor

after then i got this, in a loop (space did not work):

ROM VER: 1.1.4
CF� 01

ROM VER: 1.1.4
CFG 01

ROM VER: 1.1.4
CFG 01

How can i fix this ?

Tuning DDR begin
DDR Access auto data-eye tuning Rev 0.3a
DDR size from 0xa0000000 - 0xa3ffffff
DDR check ok... start booting...

=======================================================================
Wireless VDSL Gateway VR9 Loader V1.08.02 build Mar 12 2014 14:36:06
Arcadyan Technology Corporation

MXIC MX29GL128EL top boot 16-bit mode found

Copying boot params.....DONE

Press Space Bar 3 times to enter command mode ...123
Yes, Enter command mode ...

VR9 Boot:

======================
[#] Set Serial Number
[2] Use Normal Firmware
[3] Use ART-Testing Firmware
[9] Taggle ART Firmware Enable/Disable
[A] Set MAC Address
[E] Erase Flash
[G] Run Runtime Code
[H] Set Options
[C] Set Default Password
[P] Print Boot Params
[U] Upload to Flash
[V] Set Board Version

Enter Administrator Mode !

RAM upload destination: (default:0x80002000) : 0x80002000

$ sudo sx openwrt-lantiq-vgv7510kw22_brn-u-boot-soc12.img < /dev/ttyUSB1 > /dev/ttyUSB1

Filename 'openwrt-15.05.1-lantiq-xrx200-VGV7510KW22NOR-squashfs.image'.
Load address: 0x81000000
Loading: T T T T T T T T #################################################################
#################################################################
#################################################################
#################################################################
##########################
91.8 KiB/s
done
Bytes transferred = 4194308 (400004 hex)
VGV7510KW22 # run write-uboot-nor
................................. done
Un-Protected 33 sectors

................................. done
Erased 33 sectors
Copy to Flash... 10....9....8....7....6....5....4....3....2....1....done
VGV7510KW22 #
VGV7510KW22 #
VGV7510KW22 #
VGV7510KW22 # reset

You wrote the openwrt-15.05.1-lantiq-xrx200-VGV7510KW22NOR-squashfs.image with run write-uboot-nor to the flash position where the bootloader should be. You need to tftpload the u-boot-vgv7510kw22_nor.bin if you are using run write-uboot-nor.

Please have a look at https://wiki.openwrt.org/toh/arcadyan/vgv7510kw22#booting_via_uart on how to start a bootloader via serial console. You can find the required uboot.asc at https://downloads.lede-project.org/snapshots/targets/lantiq/xrx200/u-boot-vgv7510kw22_ram/.

The next steps are:

  1. Install u-boot
  2. Install OpenWrt from u-boot

thanks a lot, i fixed it!