I have reviewed T4240 Data Sheet and T2080 Data Sheet,found that they may be woking on the same VID mechanism.
There is a Note in T4240 Data Sheet:
"9. If VID is known at initial start-up, set VDD=VID else if VID is not known at initial start-up, set VDD to 1.025V and change it
immediately, to VDD=VID after reading VID at the beginning of booting."
Does this Note apply to T2080?
Yes.
The same functioning is described in the T2080 QorIQ Integrated Multicore Communications Processor data sheet, 4.2.1 Voltage ID (VID) controllable supply.