problem with PowerPC 8260

hello all
I am having this strange problem with powerpc 8260. we have a custom made
board with a powerpc 8260 processor. we are ruuning it on 265MHZ core speed
and 132Mhz CPM speed.
it has SMC1 as console port and SCC2 as a 10BaseT ethernet port.

we ported Linux 2.4.24 kernel to run on the board. When I put U-boot into
the board everything is OK and I can (tftp) any file I want to the SDRAM
without any problem. But when I start the kernel and try to use FTP or
SFTP to load files to shared memory /dev/shm ,I have the same board that
worked with U-boot fails when the Linux kernel is running...and simply no
error is dislayed and just the kernel crashes and everything stops and we
need to restart...and it seems nothing can cause it to crash other than
FTP through the SCC2 port...

what my question in here is what is the difference between U-boot and
linux kernel in regards to ethernet , and if anyone have an idea what it
about it this problem I would love to hear them.. Thanks




.

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