Linux doesn not boot from u-boot on ML403

[Miroslaw Dach]

I have done additional test with my u-boot and linux kernel.

I have downloaded u-boot(.elf) and zImage.elf via jtag to SDRAM:

The SDRAM has 32 MB: 
Address Map for Processor ppc405_0
  (0x00000000-0x01ffffff) DDR_SDRAM_1   plb

The steps I have doe are as following:

1. XMD% dow -data zImage.elf 0xe00000
2. XMD% dow u-boot.elf
        section, .text: 0x00800000-0x0081513c
        section, .resetvec: 0x0081513c-0x00815140
        section, .rodata: 0x00815140-0x00817ce0
        section, .reloc: 0x00817d00-0x00818674
        section, .data: 0x00818674-0x00818b08
        section, .data.rel: 0x00818b08-0x00818b34
        section, .data.rel.local: 0x00818b34-0x00818f6c
        section, .u_boot_cmd: 0x00818f6c-0x008191dc
        section, .bss: 0x00819200-0x0081dd04
Downloaded Program u-boot.elf
Setting PC with program start addr = 0x00800100
PC reset to 0x00800100, Clearing MSR Register

3. XMD% run

------------------------------------------------------------------
                output on the serial port
------------------------------------------------------------------
 
U-Boot 1.2.0 (Aug 28 2007 - 11:56:19)


U-Boot: checkboard
DRAM:  U-Boot: initdram
32 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  0 
=> 

U-Boot 1.2.0 (Aug 27 2007 - 14:23:15)


U-Boot: checkboard
DRAM:  U-Boot: initdram
32 MB
Using default environment

In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  0 
=> bootelf 0xe00000
Loading .text @ 0x00400000 (14028 bytes)
Loading .data @ 0x00404000 (995328 bytes)
Clearing .bss @ 0x004f7000 (8504 bytes)
## Starting application at 0x00400000 ...

loaded at:     00400000 004F9138
board data at: 004F7120 004F7138
relocated to:  004040B4 004040CC
zimage at:     00404E59 004F6EE8
avail ram:     004FA000 01FFFFFF

Linux/PPC load: console=ttyUL0,9600 root=/dev/nfs rw 
nfsroot=129.117.144.113:/opt/eldk41/ppc_4xx,tcp  
ip=::::virtex4-mirek:eth0:dhcp panic=1
Uncompressing Linux...


After that system just hangs.

I do not understand why it is possible to run zImage.elf straight from jtag
but it hangs when started from u-boot.

Is it any fundamental problem with running Linux from u-boot on ML403 
(Virtex-4) boards?

Best Regards

Mirek