Hi, Bela,

I'm not sure what the problem is, but I can offer a few comments that might be 
helpful...

> On May 8, 2018, at 22:50, Bela Dixit <[email protected]> wrote:
> 
> U-Boot 2011.06-rc2-00000-gd422dc0-dirty (Nov 08 2012 - 16:04:14)
> 
> CPU:   AMCC PowerPC 440EPx Rev. A at 533.333 MHz (PLB=133 OPB=66 EBC=66)
>        No Security/Kasumi support
>        Bootstrap Option C - Boot ROM Location EBC (16 bits)
>        32 kB I-Cache 32 kB D-Cache
> Board: ROACH2
> I2C:   ready
> DRAM:  512 MiB
> Flash: 128 MiB
> *** Warning - bad CRC, using default environment

Does the working ROACH2 also give this "bad CRC, using default environment" 
message?

> Linux/PowerPC load: console=ttyS0,115200 root=/dev/nfs 
> rootpath=192.168.100.1:/srv/roach_boot/etch ip=dhcp

These kernel command line options seem good.

> [    1.626566] IP-Config: Failed to open eth0
> [    1.630764] IP-Config: No network devices available
> [    1.636493] Root-NFS: no NFS server address
> [    1.640794] VFS: Unable to mount root fs via NFS, trying floppy.
> [    1.647713] VFS: Cannot open root device "nfs" or unknown-block(2,0): 
> error -6
> [    1.655011] Please append a correct "root=" boot option; here are the 
> available partitions:
> [    1.663380] 1f00            4096 mtdblock0  (driver?)
> [    1.668452] 1f01           65536 mtdblock1  (driver?)
> [    1.673513] 1f02           49152 mtdblock2  (driver?)
> [    1.678577] 1f03           11264 mtdblock3  (driver?)
> [    1.683640] 1f04             256 mtdblock4  (driver?)
> [    1.688710] 1f05             512 mtdblock5  (driver?)
> [    1.693773] Kernel panic - not syncing: VFS: Unable to mount root fs on 
> unknown-block(2,0)

It's weird that it can't mount the root filesystem.  You could check the 
"/etc/exports" file in the NFS server to make sure it is exporting the root 
filesystem to this ROACH2's IP address.   I also wonder whether the working 
ROACH2 also has these MTD partitions.   Maybe they are confusing the boot 
process?  The "Failed to open eth0" message also seems weird.  I suspect 
comparing with the console output from the working ROACH2 could offer some more 
clues.

HTH,
Dave

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