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OMAP L137 - distinguish resets + detection of supply disconnection

Hi,

we use OMAP L137 EVM and I have 2 questions:

1. How to distinguish in my software a type of preceding RESET, i.e. if the reset has been from an external source (/RESET pin, Power up, Warm Reset) or from an internal source (WDT, bus contention, sw, etc.) ? Is there any method for it and without using interrupts? 

2. Is there any detection that a OMAP power supply is going down? Some CPUs have a mechanism which sets an interrupt request to store some important data to a nonvolatile memory before the supply is totally down.

Thank you.

Radek