I got one step forward:
I've put
set bootargs console=ttyS0,115200 mtdparts=orion_nand:0x400000@0x100000(uImage),0x1fb00000@0x500000(rootfs) root=/dev/mmcblk0p1 rw,noatime ip=192.168.0.77:192.168.0.11:192.168.0.11:255.255.255.0:DB88FXX81:eth0:none
and saved it, now it boots the kernel, but hungs now here:
Root-NFS: Server returned error -13 while mounting /tftpboot/DB88FXX81
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "mmcblk0p1" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00 4096 mtdblock0 (driver?)
1f01 519168 mtdblock1 (driver?)
I guess I do not have any mmc driver or so?
mmc0: mvsdio driver initialized, lacking card detect (fall back to polling)
Registered led device: plug:green:health
mv_xor_shared mv_xor_shared.0: Marvell shared XOR driver
mv_xor_shared mv_xor_shared.1: Marvell shared XOR driver
mv_xor mv_xor.0: Marvell XOR: ( xor cpy )
mv_xor mv_xor.1: Marvell XOR: ( xor fill cpy )
mmc0: error -110 whilst initialising SD card
mv_xor mv_xor.2: Marvell XOR: ( xor cpy )