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Hi Rayuji-san,
This is not a normal use case for the device. PWRHOLD is not meant to pullup beore VRTC of VCC&. function of the PWRHOLD is to keep the device on. Which means after device turns on PWRHOLD must be pulled up within 1 sec of device turing on to keep device active.
1. Boot mode is decided as soon as device gets power.
2. It is hard to specify that as board paracits will play big factor here.
3. you cant pullup the PWRHOLD before VCC but before VRTC you can as long as you dont have any load on VRTC.
Ryuji-san,
Our local FAE will be in touch with you on this topic, we had internal discussion with him .
Also, I would highly recommend to get one EVM from ti.com . It would be very helpful to get these queris clarified with EVM as it is a stand alone EVM of the device . This will help with much better understanding of device.
Hope this helps!