Integrity RTOS issue


We are using MPC8309 Power PC processor of freescale with Integrity RTOS build on it.
We have connected a External DDRAM to CPU and want to write POST(Power On Self Test) routine for DDR RAM where we will be testing large section of DDR RAM.

Since code consists of RTOS and many background tasks running into it, i am not sure about what approach should be followed ?
Will i have to disable interrupts ?
Or what approches should be followed in software ?

Can anybody help me on this ?
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