console kernel parameter problem

Hi all,
I'm working with a board with a MPC8548 processor. I built the uboot, the DTS file (myboard.dtb) and a kernel 2.6.21 .
When I try to boot the kernel via NFS I have some exception mode when parsing the kernel parameters. Specifically I obtained an error during the parsing of "console" parameter.
My host computer is connected to the board via console using a standard 8250 port.

I append the log in this post.

Has anyone any suggestion?

Thanks in advance for the reply.

root=/dev/nfs rw nfsroot=192.168.0.90:/home/ftpuser/workspace/rootfs ip=192.168.0.11:192.168.0.90:192.168.0.90:255.255.255.0:MYBOARD:eth2:off console=ttyS1,115200

=>
=>
=> run nfsboot
Enet starting in 1000BT/FD
Speed: 1000, full duplex
Using eTSEC2 device
TFTP from server 192.168.0.90; our IP address is 192.168.0.11 Filename 'uImage'.
Load address: 0x1000000
Loading: *
Enet starting in 1000BT/FD
Speed: 1000, full duplex
Using eTSEC2 device
TFTP from server 192.168.0.90; our IP address is 192.168.0.11 Filename 'myboard.dtb'.
Load address: 0x3000000
Loading: *
## Booting image at 01000000 ...

   Image Name:   Linux-2.6.21.7
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1509390 Bytes =  1.4 MB

Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
Booting using the fdt at 0x3000000
Loading Device Tree to 007fc000, end 007fd313 ... OK
Parsing ARGS: root=/dev/nfs rw nfsroot=192.168.0.90:/home/ftpuser/workspace/rootfs ip=192.168.0.11:192.168.0.90:192.168.0.90:255.255.255.0:MYBOARD:eth2:off console=ttyS1,115200
early options: Parameter `root'
Unknown argument: calling c02dc5f0
return parse_one 0 early options: Parameter `root'
early options: Parameter `rw'
Unknown argument: calling c02dc5f0
return parse_one 0 early options: Parameter `rw'
early options: Parameter `nfsroot'
Unknown argument: calling c02dc5f0
return parse_one 0 early options: Parameter `nfsroot'
early options: Parameter `ip'
Unknown argument: calling c02dc5f0
return parse_one 0 early options: Parameter `ip'
early options: Parameter `console'
Unknown argument: calling c02dc5f0
return parse_one 0 early options: Parameter `console'
Using MYBOARD machine description
Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=256Mb residual: 256Mb Linux version 2.6.21.7 (gcc version 4.1.2 ) #2 PREEMPT Thu Mar 13 16:30:01 GMT 2008
setup_arch: bootmem
setup_arch()

arch: exit
Zone PFN ranges:

  DMA             0 ->   196608
  Normal     196608 ->   196608
  HighMem    196608 ->   262144
early_node_map[1] active PFN ranges
    0:        0 ->   262144

Built 1 zonelists. Total pages: 260096
Kernel command line: root=/dev/nfs rw nfsroot=192.168.0.90:/home/ftpuser/workspace/rootfs ip=192.168.0.11:192.168.0.90:192.168.0.90:255.255.255.0:MYBOARD:eth2:off console=ttyS1,115200
Parsing ARGS: root=/dev/nfs rw nfsroot=192.168.0.90:/home/ftpuser/workspace/rootfs ip=192.168.0.11:192.168.0.90:192.168.0.90:255.255.255.0:MYBOARD:eth2:off console=ttyS1,115200
Booting kernel: Parameter `root'
Unknown argument: calling c02dc318
return parse_one 0 Booting kernel: Parameter root=/dev/nfs' Booting kernel: Parameter rw'
Unknown argument: calling c02dc318
return parse_one 0 Booting kernel: Parameter `rw'
Booting kernel: Parameter `nfsroot'
Unknown argument: calling c02dc318
return parse_one 0 Booting kernel: Parameter `nfsroot=192.168.0.90:/home/ftpuser/workspace/rootfs'
Booting kernel: Parameter `ip'
Unknown argument: calling c02dc318
return parse_one 0 Booting kernel: Parameter ip=192.168.0.11:192.168.0.90:192.168.0.90:255.255.255.0:MYBOARD:eth2:off' Booting kernel: Parameter console'
Unknown argument: calling c02dc318

Oops: Exception in kernel mode, sig: 4 [#1]
PREEMPT
Modules linked in:
NIP: C02E7B30 LR: C02E7C28 CTR: 00000000
REGS: c031be80 TRAP: 0700   Not tainted  (2.6.21.7)
MSR: 00021000 <ME>  CR: 24084022  XER: 00000000

TASK = c02fe5b8[0] 'swapper' THREAD: c031a000
GPR00: 00000000 C031BF30 C02FE5B8 C0332184 C031BF58 C035595A C031BF5E C0300000
GPR08: 0000000A C0332184 00000001 C0332184 00000000 60000000 3FFFC400 03000000
GPR16: 00000001 00000000 007FFF00 00000000 00000000 007FFEB0 00000000 C02D6000
GPR24: 00000044 00021000 00000000 C035595A 00000001 C031BF58 C0332184 00000000
NIP [C02E7B30] add_preferred_console+0xac/0xd8
LR [C02E7C28] console_setup+0xcc/0xe4

Call Trace:

[C031BF30] [C03017C0] 0xc03017c0 (unreliable)
[C031BF50] [C02E7C28] console_setup+0xcc/0xe4
[C031BF70] [C02DC400] unknown_bootoption+0xe8/0x260 [C031BF90] [C003DDC8] parse_args+0x1f8/0x310
[C031BFC0] [C02DC7F4] start_kernel+0x16c/0x2b4
[C031BFF0] [C0000388] skpinv+0x2b8/0x2f4
Instruction dump:
48000048 3d20c030 38600000 93e9ff98 48000038 3d20c030 93e9ff98 3d20c033 39292184 57eb2036 7d6b4a14 38000000 <7d3d44aa> 7d2b45aa 38600000 938b0008

Kernel panic - not syncing: Attempted to kill the idle task!

Rebooting in 180 seconds..