LPC2136 Reboot issue

Hello everybody :)

I've a quick question regarding WinARM tool chain (4.0.2) :

I'm working with a development hardware board based on LPC2138 and the
code runs properly. We ask me to get it working on a LPC2136, but the
MCU seems to reboot (reset) every time with the same code (the hardware
is same)
I think this is due to a bad config of the linker or bad vectors mapping
:

- in the makefile : I've changed only 'SUBMDL = LPC2138' to 'SUBMDL =
LPC2136'
- in the linker file (lpc2136-ROM.ld) : same file as lpc2138-ROM.ld but
I've change only the ROM lengh ('512k' to '256k').
- in the LPC2000 bootloader : change LPC2138 to LPC2136 for the target.

Do you see other changes to switch from LPC2138 to LPC2136 MCU ?
Any idea about the MCU reset ?

Thanks in advance for your help :)

Regards,
David