[U-Boot] kernel upgradation 2.6.23 to 2.6.35.13 with old U-boot 1.3.0 version

[rajeshvangari vangari]

Hi,

I have MPC8313E-RDB board on which U-boot 1.3.0(along with patches) and
kernel 2.6.23(along with patches) are running.

Now, i would like to upgrade the kernel from 2.6.23 to 2.6.35.13 with old
U-boot 1.3.0(along with patches), i am facing problem in loading firmware
and ethernet interfaces like "eth0/eth1 : are not attached to PHY".

Is that i have to upgrade also U-boot also to latest version?
If so what version of u-boot is compatiable with linux kernel 2.6.35.13.

Please let me know what is the issue.
ASAP.

-- 
Thanks & Regards,
Rajesh Vangari.