Linux 2.6.23.rc3 boot issues on XUPV2P

[Computer - Service]

Hi all.

I try to port Linux 2.6 on my XUPV2P Board which is based on ML300.

It runs sometimes, but for the usual case it just doesn't.
My problem is the initialization.
I have no clue why I get different values almost every time.
This is a log from the same zImage.elf, which is just loaded certain 
times in the row:

loaded at:     00400000 005331A0
board data at: 0000000E 0000008A
relocated to:  00404084 00404100
zimage at:     00404EB9 00530A50
avail ram:     00534000 3B784800

Linux/PPC load: console=ttyS0,9600
Uncompressing Linux...done.
Now booting the kernel

loaded at:     00400000 005331A0
board data at: 00000000 0000007C
relocated to:  00404084 00404100
zimage at:     00404EB9 00530A50
avail ram:     00534000 7C9E2378

Linux/PPC load: console=ttyS0,9600
Uncompressing Linux...done.
Now booting the kernel

loaded at:     00400000 005331A0
board data at: 40000000 4000007C
relocated to:  00404084 00404100
zimage at:     00404EB9 00530A50
avail ram:     00534000 00000000

Linux/PPC load: console=ttyS0,9600
Uncompressing Linux...oops... out of memory
pause

loaded at:     00400000 005331A0
board data at: 00000001 0000007D
relocated to:  00404084 00404100
zimage at:     00404EB9 00530A50
avail ram:     00534000 9E23787C

Linux/PPC load: console=ttyS0,9600
Uncompressing Linux...done.
Now booting the kernel
[    0.000000] Linux version 2.6.23-rc3 (warkentin at iss2) (gcc version 
4.1.1) #1                                          Tue Aug 21 14:01:45 
CEST 2007
[    0.000000] Xilinx ML300 Reference System (Virtex-II Pro)
[    0.000000] Zone PFN ranges:
[    0.000000]   DMA             0 ->   196608


and just if the "avial ram" is about 10000000 it boots.

Anyone some idea why it could happens?