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DS411j with strange behavior, and no network (no replies)

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Hi All,


I have this unit that is behaving strangely.

Short:
it boots, it beeps as it shout but it does not work.

Long:
I have console access to the unit and can see that it loads kernel and gets to the login prompt but the network is not available.
It may or may not be the only problem.

the goal is to seek advice and try to get to the bottom of the issue, if possible repair the unit.

I have read about and played a little with uboot, tried to load kernels but am not sure if I do it correctly.
I have some soldering skills and a programmer if that is required to revive the flash.
I have linux and windows computers to troubleshoot with.

The problem is that I dont fully understand the booting process, environmental variable and the sections of flash to be able to resolve this on my own.


What have I done so far:
Have tried to load another kernel/rd but not sure did it correctly as it often didnt boot or booted with missing rd message.
[   44.080000] RAMDISK: Couldn't find valid RAM disk image starting at 0.
...
[   44.160000] No filesystem could mount root, tried:  ext3 ext2 ext4
[   44.160000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(9,0)

bootcmd=bootm F8080000 F8280000
bootargs=console=ttyS0,115200 ip=off initrd=0x00800040,4M root=/dev/md0 rw syno_hw_version=DS411jv10 ihd_num=4 netif_num=1

Where is ramdisk location for this device as it seems to me that it changes on different kernel or is it statically located in flash?
but why will it not boot when i load it manually?


I have tried change the ip-parameter to bootp and can see the nas getting an ip when kernel loads but it disappears when login prompt is shown.
when removing all other kernel paramenters besides the ip=bootp it loads to the point of halt but ip works.

conclusion, the NIC is working fine but the boot process or maybe another part of hardware is faulty?

What can I do from here?

see attachments for console output,thanks

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