install custom kernel and rootfs on board SMDKV210

Hello,

I need help to install custom uboot + kernel + rootfs on a device with board SMDKV210 (device is panel INEWTEK)

So the fact is that worked on a device (inewtek) with board SMDKV210 (call it old board so OB).
I was given a list of commands (uboot) and files (uboot + kernel + rootfs) to install our custom linux os and application on this board via serial port.
This worked perfectly.

But inewtek decided to update their product so now they sell us a new panel with board SMDKV210 (call it new board so NB).

My job is to install our custom linux os and application on this board.

Of course I am new to embedded environment so I am a bit lost.

Inewtek gave me original files (uboot + kernel + rootfs) for the new board, and I have of course our custom files.

For now I am only able to install our custom kernel on this NB, but I cannot install the custom rootfs (do we say ramdisk ?).

So bellow I give you :
Procedure and commands we used to install custom os on the OB.
Procedure and commands to install original os on NB
Procedure and commands I tried to install custom kernel and rootfs on NB
The boot trace to show the error I'm stuck at.

I think I made an error on memory addresses but I can't see the issue cause the display stop after "starting kernel...".
I read it could be because my kernel sends messages on an other output.

So please help me on this, our (very little) company can't sell product anymore.


***********************************************
***********************************************
Commands to install custom os on old board)
------------------------------------------------
setenv serverip 192.168.0.5 //tftp server ip
setenv ipaddr 192.168.0.20 // panel ip
tftp 20008000 u-boot.bin // get the custom uboot
nand erase 0 40000
nand write 20008000 0 40000
tftp 20008000 PROD-zImageMTD3 // get the custom kernel
nand erase 40000 3C0000
nand write 20008000 40000 3C0000
tftp 20008000 PROD-zImageMTD2 // get a custom temporary ramdisk we will boot on, then we could copy rootfs to mtdblock3
bootm 20008000
cd /tmp
mkdir mnt
tftp -g -r PROD-RFS-2015-06-10.tar 192.168.0.5 // get custom rootfs
flash_eraseall -j /dev/mtd3
mount -t jffs2 /dev/mtdblock3 mnt
ls mnt // should be empty
tar -xf PROD-RFS-2015-06-10.tar -C mnt // install custom rootfs
ls mnt should see all the files and folder (etc, usr, dev, var, root ...)
umount mnt
reboot
***********************************************
***********************************************

***********************************************
***********************************************
Commands to install original os on new board)
------------------------------------------------
nand erase clean;nand scrub;setenv serverip 192.168.0.5;setenv ipaddr 192.168.0.20
setenv up_uboot tftp 24000000 S5PV210_2016/u-boot.bin\;nand erase 0 60000\;nand write 24000000 0 60000;run up_uboot
setenv up_kernel tftp 24000000 S5PV210_2016/zImage\;nand erase 00600000 00300000\;nand write 24000000 00600000 00300000
setenv up_ramdisk tftp 24000000 S5PV210_2016/linux-ramdisk.gz\;nand erase 00b00000 00a00000\;nand write 24000000 00b00000 00a00000
setenv bootargs console=ttySAC2,115200 init=/linuxrc ethaddr=$ethaddr slram=dmc1,0x40000000,+0x10000000
setenv bootcmd nand read 20008000 600000 300000\;nand read 21000000 b00000 a00000\;bootm 20008000 21000000
saveenv
run up_kernel;run up_ramdisk
(reboot manually)
***********************************************
***********************************************

***********************************************
***********************************************
Commands to install custom os on new board (DO NOT WORK)
------------------------------------------------
setenv serverip 192.168.0.5
setenv ipaddr 192.168.0.20
setenv up_kernel tftp 24000000 PROD-zImageMTD3\;nand erase 00600000 003C0000\;nand write 24000000 00600000 003C0000
setenv up_ramdisk tftp 24000000 PROD-zImageMTD2\;nand erase 00b00000 00a00000\;nand write 24000000 00b00000 00a00000
setenv bootargs root=/dev/mtdblock3 rootfstype=cramfs console=ttySAC1,115200 init=/linuxrc ethaddr=$ethaddr slram=dmc1,0x40000000,+0x10000000
setenv bootcmd nand read 20008000 600000 003C0000\;nand read 21000000 b00000 a00000\;bootm 20008000 21000000
saveenv
run up_kernel;run up_ramdisk
(reboot manually)
***-----------------------------------------***
boot trace with error
-----------------------------------------------
NAND read: device 0 offset 0x600000, size : 0x3c0000
3932160 bytes read: OK

NAND read: device 0 offset 0xb00000, size : 0xa00000
10485760 bytes read: OK
Boot with zImage
The input address don't need a virtual-to-physical translation : 20008000
get_format
-------- 1 --------
## Loading init Ramdisk from Legacy Image at 21000000 ...
Image Name: ramdisk
Created: 2015-06-23 1:58:07 UTC
Image Type: ARM Linux RAMDisk Image (gzip compressed)
Data Size: 8863276 Bytes = 8.5 MB
Load Address: 20800000
Entry Point: 20800000
Verifying Checksum ... OK

Starting kernel ...

***********************************************
***********************************************