Context Switch Problem

[Samuel Bitton]

Hi

I'm currently working on a new RTEMS BSP for a custom made board based around the i386ex processor.
The software currently breaks towards the end of RTEMS initialisation, at the point where it is doing the first context switch (_Context_Switch called at the end of _Thread_Start_multitasking).

My application only has one small init task which toggles a line indefinitely. 

Any idea what could be going wrong.
I'm using RTEMS 4.6.4.

Many thanks.

Sam Bitton