pxa270 suspend

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Hi all,
is suspend/resume processing implemented in WinCe 5.0 for PXA270 processor ?
I see some code dealing with restart from deep sleep in low level
initialization code.
But OEMPowerOff implementation is empty in
\PLATFORM\COMMON\SRC\ARM\INTEL\PXA27X\POWER\off.c
So I am quite confused !
Where is the code to enter sleep state ?
Do I have to go to WinCe 6.0 where OEMPowerOff() invokes XllpPmEnterSleep ?

Best regards,
PaoloC
.