Pogo B03 Hangs on boot - VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6 (3 replies)

Re-Posted As requested

I have followed your excellent guides to reconfigure my PogoPlug B03 OXNAS [I thought I had bought an EO2 but when it arrived I realised it was a V2 case with a V3 board). I have loaded the latest U-Boot successfully ( U-Boot 2015.10-tld-2 (Oct 21 2017 - 22:00:02 -0700) OXNAS OX820 and have been able to boot openWRT via tftp as well as following the rescue instructions to allow my plug to boot from the original linux partition. In the main, I am using a serial console plugged in to this device but I can access the booted platforms with putty across the network too.

I have tried installing what I believe is the latest Debian from your instructions here

## Booting kernel from Legacy Image at 60500000 ...
   Image Name:   Linux-4.14.180-oxnas-tld-1
   Created:      1970-01-01   0:16:36 UTC
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    4609276 Bytes = 4.4 MiB
   Load Address: 60008000
   Entry Point:  60008000
   Verifying Checksum ... OK

During the boot process, I saw this message sequence

[    3.780710] hctosys: unable to open rtc device (rtc0)
[    3.786608] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
[    3.794099] Please append a correct "root=" boot option; here are the available partitions:
[    3.802534] 1f00           14336 mtdblock0
[    3.802544]  (driver?)
[    3.809144] 1f01          116736 mtdblock1
[    3.809152]  (driver?)
[    3.815741] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    3.823997] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.180-oxnas-tld-1 #1
[    3.831111] Hardware name: Generic DT based system

The last two lines on the serial console before it hangs completely are:

[    4.008005] [<c014a270>] (cpu_startup_entry) from [<60101868>] (0x60101868)
[    4.014958] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

The USB stick is EXT3 formatted 8GB capacity/partition. I blanked the stick and formatted it on a system which uses Zorin. On my last attempt to create the Boot drive, I extracted the files and linked (ox820-pogoplug-classic.dtb) using the the new kernel on the Pogoplug B03 via the serial console command prompt.

Anyone got any thoughts on where I should be looking?

Thanks - Bob